ubuntu-cve-2021-46823
Vulnerability from osv_ubuntu
Published
2022-06-18 16:15
Modified
2025-09-08 16:47
Summary
Details

python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/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": "python-ldap",
            "binary_version": "3.0.0-1ubuntu0.2"
          },
          {
            "binary_name": "python-pyldap",
            "binary_version": "3.0.0-1ubuntu0.2"
          },
          {
            "binary_name": "python3-ldap",
            "binary_version": "3.0.0-1ubuntu0.2"
          },
          {
            "binary_name": "python3-pyldap",
            "binary_version": "3.0.0-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-ldap",
        "purl": "pkg:deb/ubuntu/python-ldap@3.0.0-1ubuntu0.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.0-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.41-1",
        "2.5.2-1",
        "3.0.0~b4-1",
        "3.0.0-1",
        "3.0.0-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-ldap",
            "binary_version": "3.2.0-4ubuntu2.1"
          },
          {
            "binary_name": "python3-pyldap",
            "binary_version": "3.2.0-4ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-ldap",
        "purl": "pkg:deb/ubuntu/python-ldap@3.2.0-4ubuntu2.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.0-4ubuntu2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.0-2build1",
        "3.1.0-2build2",
        "3.2.0-3",
        "3.2.0-3ubuntu1",
        "3.2.0-3ubuntu2",
        "3.2.0-3ubuntu3",
        "3.2.0-4ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "python3-ldap",
            "binary_version": "3.2.0-4ubuntu7.1"
          },
          {
            "binary_name": "python3-pyldap",
            "binary_version": "3.2.0-4ubuntu7.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-ldap",
        "purl": "pkg:deb/ubuntu/python-ldap@3.2.0-4ubuntu7.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.0-4ubuntu7.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.0-4ubuntu5",
        "3.2.0-4ubuntu6",
        "3.2.0-4ubuntu7"
      ]
    }
  ],
  "aliases": [],
  "details": "python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.",
  "id": "UBUNTU-CVE-2021-46823",
  "modified": "2025-09-08T16:47:28Z",
  "published": "2022-06-18T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-46823"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/python-ldap/python-ldap/security/advisories/GHSA-r8wq-qrxc-hmcm"
    },
    {
      "type": "REPORT",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/221507"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5508-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-46823"
    }
  ],
  "related": [
    "USN-5508-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-46823"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.