GHSA-5WRH-4JWV-5W78

Vulnerability from github – Published: 2021-04-13 15:13 – Updated: 2024-09-30 20:28
VLAI?
Summary
Open redirect via transitional IPv6 addresses on dual-stack networks
Details

Impact

Requests to user provided domains were not restricted to external IP addresses when transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks.

Patches

This issue is fixed by #9240.

Workarounds

Outbound requests to the following address ranges can be blocked by a firewall, if unused for internal communication between systems:

  • ::ffff/80
  • ::0000/80 (note that this IP range is considered deprecated by the IETF)
  • 2002::/16 (note that this IP range is considered deprecated by the IETF)

References

Severity ?
6.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-synapse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.28.0rc1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-21392"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-04-12T21:51:49Z",
    "nvd_published_at": "2021-04-12T22:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nRequests to user provided domains were not restricted to external IP addresses when transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks.\n\n### Patches\nThis issue is fixed by #9240.\n\n### Workarounds\nOutbound requests to the following address ranges can be blocked by a firewall, if unused for internal communication between systems:\n\n* `::ffff/80`\n* `::0000/80` (note that this IP range is considered deprecated by the IETF)\n* `2002::/16` (note that this IP range is considered deprecated by the IETF)\n\n### References\n* [RFC3056](https://tools.ietf.org/html/rfc3056)\n* [RFC4291](https://tools.ietf.org/html/rfc4291)",
  "id": "GHSA-5wrh-4jwv-5w78",
  "modified": "2024-09-30T20:28:18Z",
  "published": "2021-04-13T15:13:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-5wrh-4jwv-5w78"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21392"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/pull/9240"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/synapse/commit/4ca054a4eaa714d0befb4fc30b19a1131e52c9cc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/synapse"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-25.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY"
    },
    {
      "type": "WEB",
      "url": "https://pypi.org/project/matrix-synapse"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Open redirect via transitional IPv6 addresses on dual-stack networks"
}


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Sightings

Author Source Type Date

Nomenclature

  • 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.



Detection rules are retrieved from Rulezet.