Common Weakness Enumeration
CWE-22
Allowed-with-ReviewImproper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Abstraction: Base · Status: Stable
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
14197 vulnerabilities reference this CWE, most recent first.
CVE-2026-81716 (GCVE-0-2026-81716)
Vulnerability from cvelistv5 – Published: 2026-08-27 14:51 – Updated: 2026-08-27 19:28
VLAI
EPSS
VEX
Title
openssl_encrypt before 1.4.9 Plugin Sandbox Path Traversal
Summary
openssl_encrypt (pip: openssl-encrypt) versions before 1.4.9 contain a path traversal flaw in PluginSandbox._is_safe_path, which authorized file access using a bare string-prefix match. A sandboxed plugin without the READ_FILES permission could read or write another plugin's directory that merely shares a name prefix (e.g., .../plugins/foobar matching allowed .../plugins/foo), breaking per-plugin isolation within the same user. Fixed by matching each allowed directory exactly or with a trailing path separator.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 19:28 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/jahlives/openssl_encrypt/secur… | vendor-advisory |
| https://www.vulncheck.com/advisories/openssl-encr… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jahlives | openssl_encrypt |
Affected:
0 , < 1.4.9
(semver)
Unaffected: 1.4.9 (semver) |
Date Public
2026-08-12 00:00
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CVE-2026-81659 (GCVE-0-2026-81659)
Vulnerability from cvelistv5 – Published: 2026-08-27 10:07 – Updated: 2026-08-27 15:56
VLAI
EPSS
VEX
Title
Flowintel Note PDF Export Allows Arbitrary Local File Read via Pandoc/XeLaTeX Processing
Summary
Affected versions of Flowintel allow attacker-controlled note content to be processed by Pandoc and XeLaTeX during PDF export in a way that can cause local files on the Flowintel server to be read and incorporated into the generated export.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 15:55 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
2 references
Impacted products
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CVE-2026-81560 (GCVE-0-2026-81560)
Vulnerability from cvelistv5 – Published: 2026-08-27 10:30 – Updated: 2026-08-29 02:56
VLAI
EPSS
VEX
Title
blackms aistack Static File server.ts path traversal
Summary
A vulnerability was identified in blackms aistack up to 1.6.1. Affected by this issue is some unknown functionality of the file src/web/server.ts of the component Static File Handler. Such manipulation of the argument req.url leads to path traversal. The attack can be executed remotely. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-29 02:56 UTC
CWE
- CWE-22 - Path Traversal
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/396057 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/396057/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-81560 | third-party-advisory |
| https://vuldb.com/submit/887140 | third-party-advisory |
| https://github.com/blackms/aistack/issues/57 | exploitissue-tracking |
| https://github.com/blackms/aistack/ | product |
Impacted products
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CVE-2026-81491 (GCVE-0-2026-81491)
Vulnerability from cvelistv5 – Published: 2026-08-27 02:15 – Updated: 2026-08-27 14:44
VLAI
EPSS
VEX
Title
boxpositron with-context-mcp index.ts project_folder path traversal
Summary
A flaw has been found in boxpositron with-context-mcp up to 3.0.7. This affects the function ingest_notes/teleport_notes/sync_notes/project_folder of the file src/index.ts. Executing a manipulation can lead to path traversal. It is possible to launch the attack remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 14:44 UTC
CWE
- CWE-22 - Path Traversal
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/395981 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/395981/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-81491 | third-party-advisory |
| https://vuldb.com/submit/887138 | third-party-advisory |
| http://github.com/boxpositron/with-context-mcp/issues/2 | exploitissue-tracking |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| boxpositron | with-context-mcp |
Affected:
3.0.0
Affected: 3.0.1 Affected: 3.0.2 Affected: 3.0.3 Affected: 3.0.4 Affected: 3.0.5 Affected: 3.0.6 Affected: 3.0.7 cpe:2.3:a:boxpositron:with-context-mcp:*:*:*:*:*:*:*:* |
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CVE-2026-81486 (GCVE-0-2026-81486)
Vulnerability from cvelistv5 – Published: 2026-08-27 01:30 – Updated: 2026-08-27 14:42
VLAI
EPSS
VEX
Title
bsmi021 mcp-file-context-server Path Resolution index.ts read_context path traversal
Summary
A vulnerability was detected in bsmi021 mcp-file-context-server 1.0.0. Affected by this issue is the function read_context of the file src/index.ts of the component Path Resolution. Performing a manipulation of the argument path results in path traversal. It is possible to initiate the attack remotely. The exploit is now public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 14:42 UTC
CWE
- CWE-22 - Path Traversal
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/395980 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/395980/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-81486 | third-party-advisory |
| https://vuldb.com/submit/887137 | third-party-advisory |
| https://github.com/bsmi021/mcp-file-context-serve… | exploitissue-tracking |
| https://github.com/bsmi021/mcp-file-context-server/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bsmi021 | mcp-file-context-server |
Affected:
1.0.0
cpe:2.3:a:bsmi021:mcp-file-context-server:*:*:*:*:*:*:*:* |
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CVE-2026-81485 (GCVE-0-2026-81485)
Vulnerability from cvelistv5 – Published: 2026-08-27 01:00 – Updated: 2026-08-27 14:32
VLAI
EPSS
VEX
Title
danielpopamd linkedin-ads-mcp Media Upload campaign-management.ts fs.readFileSync path traversal
Summary
A security vulnerability has been detected in danielpopamd linkedin-ads-mcp 1.0.0. Affected by this vulnerability is the function fs.readFileSync of the file src/tools/campaign-management.ts of the component Media Upload. Such manipulation of the argument filePath leads to path traversal. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 13:30 UTC
CWE
- CWE-22 - Path Traversal
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/395979 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/395979/cti | signaturepermissions-required |
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| https://vuldb.com/submit/887136 | third-party-advisory |
| https://github.com/danielpopamd/linkedin-ads-mcp/… | exploitissue-tracking |
| https://github.com/danielpopamd/linkedin-ads-mcp/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| danielpopamd | linkedin-ads-mcp |
Affected:
1.0.0
cpe:2.3:h:danielpopamd:linkedin-ads-mcp:*:*:*:*:*:*:*:* |
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CVE-2026-81030 (GCVE-0-2026-81030)
Vulnerability from cvelistv5 – Published: 2026-08-26 15:44 – Updated: 2026-08-26 16:05
VLAI
EPSS
VEX
Title
Mage AI through 0.9.79 Arbitrary File Read via Unvalidated Path in browser_items Endpoint
Summary
Mage AI does not confine the paths accepted by its browser-items API to the project directory. BrowserItemResource in mage_ai/api/resources/BrowserItemResource.py passes a caller-supplied path to the filesystem read and write helpers without calling the containment helper that the sibling FileContentResource and FileResource classes both use, so the resource contains no such call while those two contain several. A user holding the Viewer role, which grants read access within the project and nothing outside it, can therefore read any file the server process can read by supplying an absolute path. The permission model that would otherwise separate roles is not consulted for this route in the default configuration, because the setting that enables it defaults to false. Callers holding the Editor role additionally write through the same unconfined path, though that role is already able to execute code by design, so the boundary crossed by this flaw is the read available to the Viewer role.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 16:05 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/mage-ai/mage-ai | product |
| https://github.com/mage-ai/mage-ai/issues/6134 | issue-tracking |
| https://github.com/mage-ai/mage-ai/blob/0.9.79/ma… | technical-description |
| https://www.vulncheck.com/advisories/mage-ai-thro… | third-party-advisory |
Impacted products
Date Public
2026-08-26 00:00
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CVE-2026-81028 (GCVE-0-2026-81028)
Vulnerability from cvelistv5 – Published: 2026-08-26 15:44 – Updated: 2026-08-28 16:00
VLAI
EPSS
VEX
Title
ZLMediaKit downloadFile Root-Directory Confinement Bypass via Prefix Collision
Summary
ZLMediaKit confines the downloadFile API to a configured set of root directories with a prefix comparison that does not account for directory boundaries. The configuration loader in server/WebApi.cpp builds each root with File::absolutePath("", item, true); because the relative-path argument is empty that helper returns the value without a trailing separator. The handler then accepts a requested path when start_with(file_path, root) holds, so a sibling directory whose name merely begins with the configured root string satisfies the test and is served. The only other guard rejects a path containing two dots, which this requires none of. The equivalent confinement check for the ordinary static file server in src/Http/HttpFileManager.cpp computes its root with a non-empty second argument, which appends the separator before comparing, and so is not affected. The endpoint requires the configured API secret, so this grants no privilege beyond what that secret already implies, but it reads files outside the directory the operator confined it to, and the reference container runs the server as root.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 18:24 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ZLMediaKit/ZLMediaKit | product |
| https://github.com/ZLMediaKit/ZLMediaKit/issues/4817 | issue-tracking |
| https://github.com/ZLMediaKit/ZLMediaKit/blob/fa3… | technical-description |
| https://www.vulncheck.com/advisories/zlmediakit-d… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ZLMediaKit | ZLMediaKit |
Affected:
fa347d7dbe48dfdce525d3a0fdb92e576970ef9f
(git)
|
Date Public
2026-08-26 00:00
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CVE-2026-80104 (GCVE-0-2026-80104)
Vulnerability from cvelistv5 – Published: 2026-08-25 20:18 – Updated: 2026-08-29 11:48
VLAI
EPSS
VEX
Title
DB-GPT 0.8.0 Path Traversal Arbitrary File Write via Skill Upload Filename
Summary
DB-GPT builds the destination path for an uploaded skill from the multipart filename without constraining it to the upload directory. skill_upload in packages/dbgpt-app/src/dbgpt_app/openapi/api_v1/agentic_data_api.py takes file.filename as given and writes the request body to upload_dir / filename. A path composed with that operator discards the left operand when the right one is absolute and follows parent references otherwise, so a filename such as ../../../tmp/x or /tmp/x resolves outside the intended directory; nothing canonicalises the result, checks that it remains under the upload root, or prevents a .py suffix. The route's only dependency is get_user_from_headers in dbgpt_serve/utils/auth.py, which returns a request carrying the admin role whether or not a user_id header is supplied, so the endpoint is reachable without credentials. A remote attacker holding no account can therefore write attacker-controlled bytes to any path the server process can write, place a new Python module inside the application package or replace one the application already imports, and obtain code execution in the server process when that module is next imported.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 22:36 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/eosphoros-ai/DB-GPT | product |
| https://github.com/eosphoros-ai/DB-GPT/blob/v0.8.… | technical-description |
| https://github.com/eosphoros-ai/DB-GPT/releases/t… | release-notes |
| https://pypi.org/project/dbgpt-app/ | product |
| https://www.vulncheck.com/advisories/db-gpt-0.8.0… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| eosphoros-ai | DB-GPT |
Affected:
0.8.0 , < 0.8.1
(semver)
cpe:2.3:a:dbgpt:db-gpt:*:*:*:*:*:*:*:* |
Date Public
2026-08-25 00:00
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CVE-2026-79781 (GCVE-0-2026-79781)
Vulnerability from cvelistv5 – Published: 2026-08-25 15:16 – Updated: 2026-08-25 17:29
VLAI
EPSS
VEX
Title
rclone serve s3 Path Traversal via dot-dot object keys
Summary
rclone serve s3 before 1.74.4 contains a path traversal vulnerability that allows attackers to read and overwrite root-level files by using dot-dot segments in S3 object keys. Attackers can send requests with object keys like ../root-secret.txt to escape the bucket namespace and access files in the serve root directory.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 17:29 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/rclone/rclone/security/advisor… | vendor-advisory |
| https://www.vulncheck.com/advisories/rclone-serve… | third-party-advisory |
Impacted products
Date Public
2026-07-08 00:00
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"lang": "en",
"value": "rclone serve s3 before 1.74.4 contains a path traversal vulnerability that allows attackers to read and overwrite root-level files by using dot-dot segments in S3 object keys. Attackers can send requests with object keys like ../root-secret.txt to escape the bucket namespace and access files in the serve root directory."
}
],
"metrics": [
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"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "LOW"
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"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
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"problemTypes": [
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"descriptions": [
{
"cweId": "CWE-22",
"description": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
"lang": "en",
"type": "CWE"
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"dateUpdated": "2026-08-25T15:16:10.471Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"references": [
{
"name": "GitHub Security Advisory (GHSA-8v25-v8p6-qf7v)",
"tags": [
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],
"url": "https://github.com/rclone/rclone/security/advisories/GHSA-8v25-v8p6-qf7v"
},
{
"name": "VulnCheck Advisory: rclone serve s3 Path Traversal via dot-dot object keys",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/rclone-serve-s3-path-traversal-via-dot-dot-object-keys"
}
],
"title": "rclone serve s3 Path Traversal via dot-dot object keys",
"x_generator": {
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"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-79781",
"datePublished": "2026-08-25T15:16:10.471Z",
"dateReserved": "2026-08-25T14:32:37.762Z",
"dateUpdated": "2026-08-25T17:29:20.262Z",
"state": "PUBLISHED"
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Mitigation MIT-5.1
Implementation
Strategy: Input Validation
- Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
- When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
- Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
- When validating filenames, use stringent allowlists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a list of allowable file extensions, which will help to avoid CWE-434.
- Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a denylist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "\" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.
Mitigation MIT-15
Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
Mitigation MIT-20.1
Implementation
Strategy: Input Validation
- Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
- Use a built-in path canonicalization function (such as realpath() in C) that produces the canonical version of the pathname, which effectively removes ".." sequences and symbolic links (CWE-23, CWE-59). This includes:
- realpath() in C
- getCanonicalPath() in Java
- GetFullPath() in ASP.NET
- realpath() or abs_path() in Perl
- realpath() in PHP
Mitigation MIT-4
Architecture and Design
Strategy: Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
Mitigation MIT-29
Operation
Strategy: Firewall
Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].
Mitigation MIT-17
Architecture and Design
Operation
Strategy: Environment Hardening
Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
Mitigation MIT-21.1
Architecture and Design
Strategy: Enforcement by Conversion
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- For example, ID 1 could map to "inbox.txt" and ID 2 could map to "profile.txt". Features such as the ESAPI AccessReferenceMap [REF-185] provide this capability.
Mitigation MIT-22
Architecture and Design
Operation
Strategy: Sandbox or Jail
- Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
- OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
- This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
- Be careful to avoid CWE-243 and other weaknesses related to jails.
Mitigation MIT-34
Architecture and Design
Operation
Strategy: Attack Surface Reduction
- Store library, include, and utility files outside of the web document root, if possible. Otherwise, store them in a separate directory and use the web server's access control capabilities to prevent attackers from directly requesting them. One common practice is to define a fixed constant in each calling program, then check for the existence of the constant in the library/include file; if the constant does not exist, then the file was directly requested, and it can exit immediately.
- This significantly reduces the chance of an attacker being able to bypass any protection mechanisms that are in the base program but not in the include files. It will also reduce the attack surface.
Mitigation MIT-39
Implementation
- Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
- If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
- Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
- In the context of path traversal, error messages which disclose path information can help attackers craft the appropriate attack strings to move through the file system hierarchy.
Mitigation MIT-16
Operation
Implementation
Strategy: Environment Hardening
When using PHP, configure the application so that it does not use register_globals. During implementation, develop the application so that it does not rely on this feature, but be wary of implementing a register_globals emulation that is subject to weaknesses such as CWE-95, CWE-621, and similar issues.
CAPEC-126: Path Traversal
An adversary uses path manipulation methods to exploit insufficient input validation of a target to obtain access to data that should be not be retrievable by ordinary well-formed requests. A typical variety of this attack involves specifying a path to a desired file together with dot-dot-slash characters, resulting in the file access API or function traversing out of the intended directory structure and into the root file system. By replacing or modifying the expected path information the access function or API retrieves the file desired by the attacker. These attacks either involve the attacker providing a complete path to a targeted file or using control characters (e.g. path separators (/ or \) and/or dots (.)) to reach desired directories or files.
CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic
This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple ways of encoding a URL and abuse the interpretation of the URL. A URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.
CAPEC-76: Manipulating Web Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
CAPEC-78: Using Escaped Slashes in Alternate Encoding
This attack targets the use of the backslash in alternate encoding. An adversary can provide a backslash as a leading character and causes a parser to believe that the next character is special. This is called an escape. By using that trick, the adversary tries to exploit alternate ways to encode the same character which leads to filter problems and opens avenues to attack.
CAPEC-79: Using Slashes in Alternate Encoding
This attack targets the encoding of the Slash characters. An adversary would try to exploit common filtering problems related to the use of the slashes characters to gain access to resources on the target host. Directory-driven systems, such as file systems and databases, typically use the slash character to indicate traversal between directories or other container components. For murky historical reasons, PCs (and, as a result, Microsoft OSs) choose to use a backslash, whereas the UNIX world typically makes use of the forward slash. The schizophrenic result is that many MS-based systems are required to understand both forms of the slash. This gives the adversary many opportunities to discover and abuse a number of common filtering problems. The goal of this pattern is to discover server software that only applies filters to one version, but not the other.