ubuntu-cve-2021-31826
Vulnerability from osv_ubuntu
Published
2021-04-27 04:15
Modified
2026-04-22 07:40
Summary
Details

Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libapache2-mod-shib",
            "binary_version": "3.0.4+dfsg1-1ubuntu0.2"
          },
          {
            "binary_name": "libapache2-mod-shib2",
            "binary_version": "3.0.4+dfsg1-1ubuntu0.2"
          },
          {
            "binary_name": "libshibsp-plugins",
            "binary_version": "3.0.4+dfsg1-1ubuntu0.2"
          },
          {
            "binary_name": "libshibsp8",
            "binary_version": "3.0.4+dfsg1-1ubuntu0.2"
          },
          {
            "binary_name": "shibboleth-sp-common",
            "binary_version": "3.0.4+dfsg1-1ubuntu0.2"
          },
          {
            "binary_name": "shibboleth-sp-utils",
            "binary_version": "3.0.4+dfsg1-1ubuntu0.2"
          },
          {
            "binary_name": "shibboleth-sp2-common",
            "binary_version": "3.0.4+dfsg1-1ubuntu0.2"
          },
          {
            "binary_name": "shibboleth-sp2-utils",
            "binary_version": "3.0.4+dfsg1-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "shibboleth-sp",
        "purl": "pkg:deb/ubuntu/shibboleth-sp@3.0.4+dfsg1-1ubuntu0.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.4+dfsg1-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.4+dfsg1-1",
        "3.0.4+dfsg1-1build1",
        "3.0.4+dfsg1-1ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.",
  "id": "UBUNTU-CVE-2021-31826",
  "modified": "2026-04-22T07:40:02Z",
  "published": "2021-04-27T04:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-31826"
    },
    {
      "type": "REPORT",
      "url": "https://shibboleth.net/community/advisories/secadv_20210426.txt"
    },
    {
      "type": "REPORT",
      "url": "https://issues.shibboleth.net/jira/browse/SSPCPP-927"
    },
    {
      "type": "REPORT",
      "url": "https://git.shibboleth.net/view/?p=cpp-sp.git;a=commit;h=5a47c3b9378f4c49392dd4d15189b70956f9f2ec"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.debian.org/987608"
    },
    {
      "type": "REPORT",
      "url": "https://www.debian.org/security/2021/dsa-4905"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-31826"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-31826"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.