pysec-2023-139
Vulnerability from pysec
Published
2023-08-04 16:15
Modified
2023-08-17 03:22
Severity ?
5.3 (Medium) - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Details

Sydent is an identity server for the Matrix communications protocol. Prior to version 2.5.6, if configured to send emails using TLS, Sydent does not verify SMTP servers' certificates. This makes Sydent's emails vulnerable to interception via a man-in-the-middle (MITM) attack. Attackers with privileged access to the network can intercept room invitations and address confirmation emails. This is patched in Sydent 2.5.6. When patching, make sure that Sydent trusts the certificate of the server it is connecting to. This should happen automatically when using properly issued certificates. Those who use self-signed certificates should make sure to copy their Certification Authority certificate, or their self signed certificate if using only one, to the trust store of your operating system. As a workaround, one can ensure Sydent's emails fail to send by setting the configured SMTP server to a loopback or non-routable address under one's control which does not have a listening SMTP server.

Impacted products
Name purl
matrix-sydent pkg:pypi/matrix-sydent
Aliases


To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "matrix-sydent",
        "purl": "pkg:pypi/matrix-sydent"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1cd748307c6b168b66154e6c4db715d4b9551261"
            }
          ],
          "repo": "https://github.com/matrix-org/sydent",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.0",
        "2.0.1",
        "2.1.0",
        "2.2.0",
        "2.3.0",
        "2.4.0",
        "2.4.1",
        "2.4.2",
        "2.4.3",
        "2.4.4",
        "2.4.5",
        "2.4.6",
        "2.5.0",
        "2.5.1",
        "2.5.2",
        "2.5.3",
        "2.5.4",
        "2.5.5"
      ]
    }
  ],
  "aliases": [
    "CVE-2023-38686",
    "GHSA-p6hw-wm59-3g5g"
  ],
  "details": "Sydent is an identity server for the Matrix communications protocol. Prior to version 2.5.6, if configured to send emails using TLS, Sydent does not verify SMTP servers\u0027 certificates. This makes  Sydent\u0027s emails vulnerable to interception via a man-in-the-middle (MITM) attack. Attackers with privileged access to the network can intercept room invitations and address confirmation emails. This is patched in Sydent 2.5.6. When patching, make sure that Sydent trusts the certificate of the server it is connecting to. This should happen automatically when using properly issued certificates. Those who use self-signed certificates should make sure to copy their Certification Authority certificate, or their self signed certificate if using only one, to the trust store of your operating system. As a workaround, one can ensure Sydent\u0027s emails fail to send by setting the configured SMTP server to a loopback or non-routable address under one\u0027s control which does not have a listening SMTP server.",
  "id": "PYSEC-2023-139",
  "modified": "2023-08-17T03:22:32.583512+00:00",
  "published": "2023-08-04T16:15:00+00:00",
  "references": [
    {
      "type": "REPORT",
      "url": "https://github.com/python/cpython/issues/91826"
    },
    {
      "type": "FIX",
      "url": "https://github.com/matrix-org/sydent/commit/1cd748307c6b168b66154e6c4db715d4b9551261"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/sydent/releases/tag/v2.5.6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/matrix-org/sydent/security/advisories/GHSA-p6hw-wm59-3g5g"
    },
    {
      "type": "WEB",
      "url": "https://peps.python.org/pep-0476/"
    },
    {
      "type": "WEB",
      "url": "https://docs.python.org/3/library/ssl.html?highlight=ssl#security-considerations"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/matrix-org/sydent/pull/574"
    },
    {
      "type": "FIX",
      "url": "https://github.com/matrix-org/sydent/pull/574"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.