GHSA-9654-PR4F-GH6M

Vulnerability from github – Published: 2023-03-10 22:15 – Updated: 2023-12-15 22:19
VLAI?
Summary
HL7 FHIR Partial Path Zip Slip due to bypass of CVE-2023-24057
Details

Impact

Zip Slip protections implemented in CVE-2023-24057 (GHSA-jqh6-9574-5x22) can be bypassed due a partial path traversal vulnerability.

This issue allows a malicious actor to potentially break out of the TerminologyCacheManager cache directory. The impact is limited to sibling directories.

To demonstrate the vulnerability, consider userControlled.getCanonicalPath().startsWith("/usr/out") will allow an attacker to access a directory with a name like /usr/outnot.

Why?

To demonstrate this vulnerability, consider "/usr/outnot".startsWith("/usr/out"). The check is bypassed although /outnot is not under the /out directory. It's important to understand that the terminating slash may be removed when using various String representations of the File object. For example, on Linux, println(new File("/var")) will print /var, but println(new File("/var", "/") will print /var/; however, println(new File("/var", "/").getCanonicalPath()) will print /var.

The Fix

Comparing paths with the java.nio.files.Path#startsWith will adequately protect againts this vulnerability.

For example: file.getCanonicalFile().toPath().startsWith(BASE_DIRECTORY) or file.getCanonicalFile().toPath().startsWith(BASE_DIRECTORY_FILE.getCanonicalFile().toPath())

Other Examples

Vulnerability

https://github.com/hapifhir/org.hl7.fhir.core/blob/b0daf666725fa14476d147522155af1e81922aac/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/terminologies/TerminologyCacheManager.java#L99-L105

While getAbsolutePath will return a normalized path, because the string path is not slash terminated, the guard can be bypassed to write the contents of the Zip file to a sibling directory of the cache directory.

Patches

All org.hl7.fhir.core libraries should be updated to 5.6.106. - https://github.com/hapifhir/org.hl7.fhir.core/pull/1162

Workarounds

Unknown

References

  • https://snyk.io/research/zip-slip-vulnerability
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "ca.uhn.hapi.fhir:org.hl7.fhir.core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.6.106"
            }
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          "type": "ECOSYSTEM"
        }
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    },
    {
      "package": {
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        "name": "ca.uhn.hapi.fhir:org.hl7.fhir.convertors"
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      "package": {
        "ecosystem": "Maven",
        "name": "ca.uhn.hapi.fhir:org.hl7.fhir.r5"
      },
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        {
          "events": [
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    {
      "package": {
        "ecosystem": "Maven",
        "name": "ca.uhn.hapi.fhir:org.hl7.fhir.utilities"
      },
      "ranges": [
        {
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            {
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        "name": "ca.uhn.hapi.fhir:org.hl7.fhir.validation"
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          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-28465"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-03-10T22:15:55Z",
    "nvd_published_at": "2023-12-12T17:15:07Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nZip Slip protections implemented in CVE-2023-24057 (GHSA-jqh6-9574-5x22) can be bypassed due a partial path traversal vulnerability.\n\nThis issue allows a malicious actor to potentially break out of the `TerminologyCacheManager` cache directory. The impact is limited to sibling directories.\n\nTo demonstrate the vulnerability, consider `userControlled.getCanonicalPath().startsWith(\"/usr/out\")` will allow an attacker to access a directory with a name like `/usr/outnot`. \n\n### Why?\n\nTo demonstrate this vulnerability, consider `\"/usr/outnot\".startsWith(\"/usr/out\")`.\nThe check is bypassed although `/outnot` is not under the `/out` directory.\nIt\u0027s important to understand that the terminating slash may be removed when using various `String` representations of the `File` object.\nFor example, on Linux, `println(new File(\"/var\"))` will print `/var`, but `println(new File(\"/var\", \"/\")` will print `/var/`;\nhowever, `println(new File(\"/var\", \"/\").getCanonicalPath())` will print `/var`.\n\n### The Fix\n\nComparing paths with the `java.nio.files.Path#startsWith` will adequately protect againts this vulnerability.\n\nFor example: `file.getCanonicalFile().toPath().startsWith(BASE_DIRECTORY)` or `file.getCanonicalFile().toPath().startsWith(BASE_DIRECTORY_FILE.getCanonicalFile().toPath())`\n\n### Other Examples\n\n - [CVE-2022-31159](https://github.com/aws/aws-sdk-java/security/advisories/GHSA-c28r-hw5m-5gv3) - aws/aws-sdk-java\n - [CVE-2022-23457](https://securitylab.github.com/advisories/GHSL-2022-008_The_OWASP_Enterprise_Security_API/) - ESAPI/esapi-java-legacy\n\n### Vulnerability\n\nhttps://github.com/hapifhir/org.hl7.fhir.core/blob/b0daf666725fa14476d147522155af1e81922aac/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/terminologies/TerminologyCacheManager.java#L99-L105\n\nWhile `getAbsolutePath` will return a normalized path, because the string `path` is not slash terminated, the guard can be bypassed to write the contents of the Zip file to a sibling directory of the cache directory.\n\n### Patches\nAll org.hl7.fhir.core libraries should be updated to 5.6.106.\n - https://github.com/hapifhir/org.hl7.fhir.core/pull/1162\n\n### Workarounds\nUnknown\n\n### References\n* https://snyk.io/research/zip-slip-vulnerability\n",
  "id": "GHSA-9654-pr4f-gh6m",
  "modified": "2023-12-15T22:19:57Z",
  "published": "2023-03-10T22:15:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-9654-pr4f-gh6m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-28465"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core/pull/1162"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-9654-pr4f-gh6m"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core/blob/b0daf666725fa14476d147522155af1e81922aac/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/terminologies/TerminologyCacheManager.java#L99-L105"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/5.6.106"
    },
    {
      "type": "WEB",
      "url": "https://www.smilecdr.com/our-blog"
    },
    {
      "type": "WEB",
      "url": "https://www.smilecdr.com/our-blog/statement-on-cve-2023-24057-smile-digital-health"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "HL7 FHIR Partial Path Zip Slip due to bypass of CVE-2023-24057"
}


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