PYSEC-2023-139

Vulnerability from pysec - Published: 2023-08-04 16:15 - Updated: 2023-08-17 03:22
VLAI?
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.

Severity ?
5.3 (Medium)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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"
    }
  ]
}


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  • 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.
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  • 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.