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GHSA-8FP4-RP6C-5GCV

Vulnerability from github – Published: 2021-12-02 22:25 – Updated: 2021-12-02 21:28
VLAI
Summary
Path Traversal in com.linecorp.armeria:armeria
Details

Impact

An attacker can access an Armeria server's local file system beyond its restricted directory by sending an HTTP request whose path contains %2F (encoded /), such as /files/..%2Fsecrets.txt, bypassing Armeria's path validation logic.

Patches

Armeria 1.13.4 or above contains the hardened path validation logic that handles %2F properly.

Workarounds

This vulnerability can be worked around by inserting a decorator that performs an additional validation on the request path, e.g.

Server
  .builder()
  .serviceUnder(
    "/files",
    FileService
      .of(...)
      .decorate((delegate, ctx, req) -> {
        String path = req.headers().path();
        if (path.contains("%2f") || path.contains("%2F")) {
          return HttpResponse.of(HttpStatus.BAD_REQUEST);
        }
        return delegate.serve(ctx, req);
      })
  )
  .build()

For more information

If you have any questions or comments about this advisory: * Open an issue in line/armeria * Chat with us at Slack

Credits

This vulnerability was originally reported by Abdallah Zaher (elcayser-0x0a).

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": "com.linecorp.armeria:armeria"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.12.0"
            },
            {
              "fixed": "1.13.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-43795"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-12-02T21:28:29Z",
    "nvd_published_at": "2021-12-02T18:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nAn attacker can access an Armeria server\u0027s local file system beyond its restricted directory by sending an HTTP request whose path contains `%2F` (encoded `/`), such as `/files/..%2Fsecrets.txt`, bypassing Armeria\u0027s path validation logic.\n\n### Patches\n\nArmeria 1.13.4 or above contains the hardened path validation logic that handles `%2F` properly. \n\n### Workarounds\n\nThis vulnerability can be worked around by inserting a decorator that performs an additional validation on the request path, e.g.\n\n```java\nServer\n  .builder()\n  .serviceUnder(\n    \"/files\",\n    FileService\n      .of(...)\n      .decorate((delegate, ctx, req) -\u003e {\n        String path = req.headers().path();\n        if (path.contains(\"%2f\") || path.contains(\"%2F\")) {\n          return HttpResponse.of(HttpStatus.BAD_REQUEST);\n        }\n        return delegate.serve(ctx, req);\n      })\n  )\n  .build()\n```\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [line/armeria](https://github.com/line/armeria)\n* Chat with us at [Slack](https://armeria.dev/s/slack)\n\n### Credits\n\nThis vulnerability was originally reported by Abdallah Zaher ([elcayser-0x0a](https://hackerone.com/elcayser-0x0a?type=user)).",
  "id": "GHSA-8fp4-rp6c-5gcv",
  "modified": "2021-12-02T21:28:29Z",
  "published": "2021-12-02T22:25:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/line/armeria/security/advisories/GHSA-8fp4-rp6c-5gcv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-43795"
    },
    {
      "type": "WEB",
      "url": "https://github.com/line/armeria/pull/3855"
    },
    {
      "type": "WEB",
      "url": "https://github.com/line/armeria/commit/e2697a575e9df6692b423e02d731f293c1313284"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/line/armeria"
    }
  ],
  "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": "Path Traversal in com.linecorp.armeria:armeria"
}



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