GHSA-9JHM-8M8C-C3F4

Vulnerability from github – Published: 2021-04-19 14:54 – Updated: 2024-09-30 20:40
VLAI?
Summary
SSRF in Sydent due to missing validation of hostnames
Details

Impact

Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting.

It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration.

Patches

Fixed in 9e57334, 8936925, 3d531ed, 0f00412

Workarounds

A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.

For more information

If you have any questions or comments about this advisory, email us at security@matrix.org.

Severity ?
7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-sydent"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-29431"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-04-15T21:00:29Z",
    "nvd_published_at": "2021-04-15T21:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nSydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting.\n\nIt is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration.\n\n### Patches\n\nFixed in 9e57334, 8936925, 3d531ed, 0f00412\n\n### Workarounds\n\nA potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.\n\n### For more information\n\nIf you have any questions or comments about this advisory, email us at security@matrix.org.",
  "id": "GHSA-9jhm-8m8c-c3f4",
  "modified": "2024-09-30T20:40:49Z",
  "published": "2021-04-19T14:54:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-29431"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/sydent"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/sydent/releases/tag/v2.3.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-22.yaml"
    },
    {
      "type": "WEB",
      "url": "https://pypi.org/project/matrix-sydent"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "SSRF in Sydent due to missing validation of hostnames"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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