ghsa-53jx-vvf9-4x38
Vulnerability from github
Published
2023-02-10 03:27
Modified
2023-02-10 03:27
Severity ?
4.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Summary
StaticHandler disclosure of classpath resources on Windows when mounted on a wildcard route
Details

Summary

When running vertx web applications that serve files using StaticHandler on Windows Operating Systems and Windows File Systems, if the mount point is a wildcard (*) then an attacker can exfiltrate any class path resource.

Details

When computing the relative path to locate the resource, in case of wildcards, the code:

https://github.com/vert-x3/vertx-web/blob/62c0d66fa1c179ae6a4d57344631679a2b97e60f/vertx-web/src/main/java/io/vertx/ext/web/impl/Utils.java#L83

returns the user input (without validation) as the segment to lookup. Even though checks are performed to avoid escaping the sandbox, given that the input was not sanitized \ are not properly handled and an attacker can build a path that is valid within the classpath.

PoC

https://github.com/adrien-aubert-drovio/vertx-statichandler-windows-traversal-path-vulnerability

Show details on source website

To clipboard 

{
   affected: [
      {
         package: {
            ecosystem: "Maven",
            name: "io.vertx:vertx-web",
         },
         ranges: [
            {
               events: [
                  {
                     introduced: "4.0.0",
                  },
                  {
                     fixed: "4.3.8",
                  },
               ],
               type: "ECOSYSTEM",
            },
         ],
      },
   ],
   aliases: [
      "CVE-2023-24815",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-22",
      ],
      github_reviewed: true,
      github_reviewed_at: "2023-02-10T03:27:58Z",
      nvd_published_at: "2023-02-09T18:15:00Z",
      severity: "MODERATE",
   },
   details: "### Summary\n\nWhen running vertx web applications that serve files using `StaticHandler` on Windows Operating Systems and Windows File Systems, if the mount point is a wildcard (`*`) then an attacker can exfiltrate any class path resource.\n\n\n### Details\nWhen computing the relative path to locate the resource, in case of wildcards, the code:\n\nhttps://github.com/vert-x3/vertx-web/blob/62c0d66fa1c179ae6a4d57344631679a2b97e60f/vertx-web/src/main/java/io/vertx/ext/web/impl/Utils.java#L83\n\nreturns the user input (without validation) as the segment to lookup. Even though checks are performed to avoid escaping the sandbox, given that the input was not sanitized `\\` are not properly handled and an attacker can build a path that is valid within the classpath.\n\n### PoC\n\nhttps://github.com/adrien-aubert-drovio/vertx-statichandler-windows-traversal-path-vulnerability",
   id: "GHSA-53jx-vvf9-4x38",
   modified: "2023-02-10T03:27:58Z",
   published: "2023-02-10T03:27:58Z",
   references: [
      {
         type: "WEB",
         url: "https://github.com/vert-x3/vertx-web/security/advisories/GHSA-53jx-vvf9-4x38",
      },
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2023-24815",
      },
      {
         type: "WEB",
         url: "https://github.com/vert-x3/vertx-web/commit/9e3a783b1d1a731055e9049078b1b1494ece9c15",
      },
      {
         type: "PACKAGE",
         url: "https://github.com/vert-x3/vertx-web",
      },
      {
         type: "WEB",
         url: "https://github.com/vert-x3/vertx-web/blob/62c0d66fa1c179ae6a4d57344631679a2b97e60f/vertx-web/src/main/java/io/vertx/ext/web/impl/Utils.java#L83",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
         type: "CVSS_V3",
      },
   ],
   summary: "StaticHandler disclosure of classpath resources on Windows when mounted on a wildcard route",
}


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