Common Weakness Enumeration

CWE-77

Allowed-with-Review

Improper Neutralization of Special Elements used in a Command ('Command Injection')

Abstraction: Class · Status: Draft

The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

5379 vulnerabilities reference this CWE, most recent first.

GHSA-CFWC-XJFP-44JG

Vulnerability from github – Published: 2020-09-04 17:19 – Updated: 2020-08-31 18:59
VLAI
Summary
Command Injection in gnuplot
Details

All versions of gnuplot are vulnerable to Command Injection. The package fails to sanitize plot titles, which may allow attackers to execute arbitrary code in the system if the title value is supplied by a user. The following proof-of-concept creates a testing file in the current directory:

var gnuplot = require('gnuplot');

const title = '"\nset title system("touch testing")\n#';

gnuplot()
.set('term png')
.set('output "out.png"')
.set(`title "${title}"`)
.set('xrange [-10:10]')
.set('yrange [-2:2]')
.set('zeroaxis')
.plot('(x/4)**2, sin(x), 1/x')
.end();

Recommendation

No fix is currently available. Consider using an alternative package until a fix is made available.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "gnuplot"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-77"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-08-31T18:59:23Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "All versions of `gnuplot` are vulnerable to Command Injection. The package fails to sanitize plot titles, which may allow attackers to execute arbitrary code in the system if the title value is supplied by a user. The following proof-of-concept creates a `testing` file in the current directory:\n\n```\nvar gnuplot = require(\u0027gnuplot\u0027);\n\nconst title = \u0027\"\\nset title system(\"touch testing\")\\n#\u0027;\n\ngnuplot()\n.set(\u0027term png\u0027)\n.set(\u0027output \"out.png\"\u0027)\n.set(`title \"${title}\"`)\n.set(\u0027xrange [-10:10]\u0027)\n.set(\u0027yrange [-2:2]\u0027)\n.set(\u0027zeroaxis\u0027)\n.plot(\u0027(x/4)**2, sin(x), 1/x\u0027)\n.end();\n```\n\n\n## Recommendation\n\nNo fix is currently available. Consider using an alternative package until a fix is made available.",
  "id": "GHSA-cfwc-xjfp-44jg",
  "modified": "2020-08-31T18:59:23Z",
  "published": "2020-09-04T17:19:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/advisories/1440"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "Command Injection in gnuplot"
}

GHSA-CFXC-CH9M-PR95

Vulnerability from github – Published: 2024-07-09 03:31 – Updated: 2024-07-09 03:31
VLAI
Details

A local privilege escalation vlnerability in the WatchGuard Mobile VPN with SSL client on Windows enables a local user to execute arbitrary commands with elevated privileged.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-4944"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-09T03:15:02Z",
    "severity": "HIGH"
  },
  "details": "A local privilege escalation vlnerability in the WatchGuard Mobile VPN with SSL client on Windows enables a local user to execute arbitrary commands with elevated privileged.\n",
  "id": "GHSA-cfxc-ch9m-pr95",
  "modified": "2024-07-09T03:31:44Z",
  "published": "2024-07-09T03:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-4944"
    },
    {
      "type": "WEB",
      "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00010"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-CG2M-256M-59RQ

Vulnerability from github – Published: 2026-01-06 21:30 – Updated: 2026-01-06 21:30
VLAI
Details

A security vulnerability has been detected in TOTOLINK WA300 5.2cu.7112_B20190227. This vulnerability affects the function sub_401510 of the file cstecgi.cgi. The manipulation of the argument UPLOAD_FILENAME leads to command injection. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-0641"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-74",
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-06T19:16:07Z",
    "severity": "MODERATE"
  },
  "details": "A security vulnerability has been detected in TOTOLINK WA300 5.2cu.7112_B20190227. This vulnerability affects the function sub_401510 of the file cstecgi.cgi. The manipulation of the argument UPLOAD_FILENAME leads to command injection. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.",
  "id": "GHSA-cg2m-256m-59rq",
  "modified": "2026-01-06T21:30:34Z",
  "published": "2026-01-06T21:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-0641"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JackWesleyy/CVE/blob/main/WA300/TOTOLINK_WA300_RCE.md"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JackWesleyy/CVE/blob/main/WA300/TOTOLINK_WA300_RCE.md#poc"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?ctiid.339684"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?id.339684"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?submit.732234"
    },
    {
      "type": "WEB",
      "url": "https://www.totolink.net"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-CG3H-9F75-2RJP

Vulnerability from github – Published: 2025-03-05 21:32 – Updated: 2025-03-06 15:34
VLAI
Details

Tenda AC15 v15.03.05.19 is vulnerable to Command Injection via the handler function in /goform/telnet.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-25632"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-05T21:15:19Z",
    "severity": "CRITICAL"
  },
  "details": "Tenda AC15 v15.03.05.19 is vulnerable to Command Injection via the handler function in /goform/telnet.",
  "id": "GHSA-cg3h-9f75-2rjp",
  "modified": "2025-03-06T15:34:46Z",
  "published": "2025-03-05T21:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-25632"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Pr0b1em/IoT/blob/master/TendaAC15v15.03.05.19telnet.md"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-CG57-RMWP-QVM9

Vulnerability from github – Published: 2026-03-31 00:31 – Updated: 2026-03-31 00:31
VLAI
Details

A flaw has been found in Tenda CH22 1.0.0.1. The affected element is the function FormWriteFacMac of the file /goform/WriteFacMac. Executing a manipulation of the argument mac can lead to command injection. The attack may be launched remotely. The exploit has been published and may be used.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-5153"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-74",
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-30T22:16:20Z",
    "severity": "MODERATE"
  },
  "details": "A flaw has been found in Tenda CH22 1.0.0.1. The affected element is the function FormWriteFacMac of the file /goform/WriteFacMac. Executing a manipulation of the argument mac can lead to command injection. The attack may be launched remotely. The exploit has been published and may be used.",
  "id": "GHSA-cg57-rmwp-qvm9",
  "modified": "2026-03-31T00:31:13Z",
  "published": "2026-03-31T00:31:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5153"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Litengzheng/vuldb_new/blob/main/CH22/vul_60/README.md"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/780204"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/354185"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/354185/cti"
    },
    {
      "type": "WEB",
      "url": "https://www.tenda.com.cn"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-CG8C-XFW6-PWWG

Vulnerability from github – Published: 2024-11-25 06:34 – Updated: 2024-11-25 06:34
VLAI
Details

A vulnerability, which was classified as critical, has been found in EnGenius ENH1350EXT, ENS500-AC and ENS620EXT up to 20241118. This issue affects some unknown processing of the file /admin/network/diag_ping6. The manipulation of the argument diag_ping6 leads to command injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-11656"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-74",
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-11-25T05:15:10Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability, which was classified as critical, has been found in EnGenius ENH1350EXT, ENS500-AC and ENS620EXT up to 20241118. This issue affects some unknown processing of the file /admin/network/diag_ping6. The manipulation of the argument diag_ping6 leads to command injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.",
  "id": "GHSA-cg8c-xfw6-pwwg",
  "modified": "2024-11-25T06:34:58Z",
  "published": "2024-11-25T06:34:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-11656"
    },
    {
      "type": "WEB",
      "url": "https://k9u7kv33ub.feishu.cn/wiki/FBJCwjFPZiY4aakElh6cwF25nff"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?ctiid.285977"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?id.285977"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?submit.446639"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-CGF3-4CM8-WH3P

Vulnerability from github – Published: 2024-12-16 06:30 – Updated: 2024-12-16 18:31
VLAI
Details

An issue was discovered in Logpoint before 7.5.0. Authenticated users can inject payloads in Report Templates. These are executed when the backup process is initiated, leading to Remote Code Execution.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-56086"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-16T06:15:07Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered in Logpoint before 7.5.0. Authenticated users can inject payloads in Report Templates. These are executed when the backup process is initiated, leading to Remote Code Execution.",
  "id": "GHSA-cgf3-4cm8-wh3p",
  "modified": "2024-12-16T18:31:08Z",
  "published": "2024-12-16T06:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56086"
    },
    {
      "type": "WEB",
      "url": "https://servicedesk.logpoint.com/hc/en-us/articles/22136886421277-Remote-Code-Execution-while-creating-Report-Templates"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-CGFC-76RC-PXPQ

Vulnerability from github – Published: 2025-08-21 03:30 – Updated: 2025-08-21 15:30
VLAI
Details

An Improper Input Validation in EdgeMAX EdgeSwitch (Version 1.11.0 and earlier) could allow a Command Injection by a malicious actor with access to EdgeSwitch adjacent network.

Affected Products:

EdgeMAX EdgeSwitch (Version 1.11.0 and earlier)

Mitigation:

Update the EdgeMAX EdgeSwitch to Version 1.11.1 or later.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-48978"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-21T01:15:36Z",
    "severity": "HIGH"
  },
  "details": "An Improper Input Validation in EdgeMAX EdgeSwitch (Version 1.11.0 and earlier) could allow a Command Injection by a malicious actor with access to EdgeSwitch adjacent network.\n\nAffected Products:\n\nEdgeMAX EdgeSwitch (Version 1.11.0 and earlier) \n\n  \n\nMitigation:\n\nUpdate the EdgeMAX EdgeSwitch to Version 1.11.1 or later.",
  "id": "GHSA-cgfc-76rc-pxpq",
  "modified": "2025-08-21T15:30:34Z",
  "published": "2025-08-21T03:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-48978"
    },
    {
      "type": "WEB",
      "url": "https://community.ui.com/releases/Security-Advisory-Bulletin-054-054/3033f0b7-aca6-4d70-8c51-d3e706bd0ca7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-CGJM-X4Q6-H8HJ

Vulnerability from github – Published: 2023-03-29 00:30 – Updated: 2023-04-04 21:30
VLAI
Details

TOTOlink A7100RU V7.4cu.2313_B20191024 was discovered to contain a command injection vulnerability via the wanStrategy parameter at /setting/setWanIeCfg.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-27232"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-03-28T23:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "TOTOlink A7100RU V7.4cu.2313_B20191024 was discovered to contain a command injection vulnerability via the wanStrategy parameter at /setting/setWanIeCfg.",
  "id": "GHSA-cgjm-x4q6-h8hj",
  "modified": "2023-04-04T21:30:18Z",
  "published": "2023-03-29T00:30:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-27232"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Am1ngl/ttt/tree/main/32"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-CGXR-FJ7H-WC3W

Vulnerability from github – Published: 2022-05-24 19:15 – Updated: 2022-05-24 19:15
VLAI
Details

Edgecore ECS2020 Firmware 1.0.0.0 devices allow Unauthenticated Command Injection via the command1 HTTP header to the /EXCU_SHELL URI.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2019-6288"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-09-22T17:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "Edgecore ECS2020 Firmware 1.0.0.0 devices allow Unauthenticated Command Injection via the command1 HTTP header to the /EXCU_SHELL URI.",
  "id": "GHSA-cgxr-fj7h-wc3w",
  "modified": "2022-05-24T19:15:25Z",
  "published": "2022-05-24T19:15:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-6288"
    },
    {
      "type": "WEB",
      "url": "https://twitter.com/r00treaver/status/1232407881464635401"
    },
    {
      "type": "WEB",
      "url": "https://www.edge-core.com"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Mitigation
Architecture and Design

If at all possible, use library calls rather than external processes to recreate the desired functionality.

Mitigation
Implementation

If possible, ensure that all external commands called from the program are statically created.

Mitigation MIT-5
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.
Mitigation
Operation

Run time: Run time policy enforcement may be used in an allowlist fashion to prevent use of any non-sanctioned commands.

Mitigation
System Configuration

Assign permissions that prevent the user from accessing/opening privileged files.

CAPEC-136: LDAP Injection

An attacker manipulates or crafts an LDAP query for the purpose of undermining the security of the target. Some applications use user input to create LDAP queries that are processed by an LDAP server. For example, a user might provide their username during authentication and the username might be inserted in an LDAP query during the authentication process. An attacker could use this input to inject additional commands into an LDAP query that could disclose sensitive information. For example, entering a * in the aforementioned query might return information about all users on the system. This attack is very similar to an SQL injection attack in that it manipulates a query to gather additional information or coerce a particular return value.

CAPEC-15: Command Delimiters

An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or denylist input validation, as opposed to allowlist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or denylist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.

CAPEC-183: IMAP/SMTP Command Injection

An adversary exploits weaknesses in input validation on web-mail servers to execute commands on the IMAP/SMTP server. Web-mail servers often sit between the Internet and the IMAP or SMTP mail server. User requests are received by the web-mail servers which then query the back-end mail server for the requested information and return this response to the user. In an IMAP/SMTP command injection attack, mail-server commands are embedded in parts of the request sent to the web-mail server. If the web-mail server fails to adequately sanitize these requests, these commands are then sent to the back-end mail server when it is queried by the web-mail server, where the commands are then executed. This attack can be especially dangerous since administrators may assume that the back-end server is protected against direct Internet access and therefore may not secure it adequately against the execution of malicious commands.

CAPEC-248: Command Injection

An adversary looking to execute a command of their choosing, injects new items into an existing command thus modifying interpretation away from what was intended. Commands in this context are often standalone strings that are interpreted by a downstream component and cause specific responses. This type of attack is possible when untrusted values are used to build these command strings. Weaknesses in input validation or command construction can enable the attack and lead to successful exploitation.

CAPEC-40: Manipulating Writeable Terminal Devices

This attack exploits terminal devices that allow themselves to be written to by other users. The attacker sends command strings to the target terminal device hoping that the target user will hit enter and thereby execute the malicious command with their privileges. The attacker can send the results (such as copying /etc/passwd) to a known directory and collect once the attack has succeeded.

CAPEC-43: Exploiting Multiple Input Interpretation Layers

An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: <parser1> --> <input validator> --> <parser2>. In such cases, the attacker will need to provide input that will pass through the input validator, but after passing through parser2, will be converted into something that the input validator was supposed to stop.

CAPEC-75: Manipulating Writeable Configuration Files

Generally these are manually edited files that are not in the preview of the system administrators, any ability on the attackers' behalf to modify these files, for example in a CVS repository, gives unauthorized access directly to the application, the same as authorized users.

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.