ubuntu-cve-2021-33910
Vulnerability from osv_ubuntu
Published
2021-07-20 12:00
Modified
2026-04-22 07:40
Summary
Details

basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
high
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libnss-myhostname",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "libnss-mymachines",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "libnss-resolve",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "libpam-systemd",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "libsystemd0",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "libudev1",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "systemd",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "systemd-container",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "systemd-coredump",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "systemd-journal-remote",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "systemd-sysv",
            "binary_version": "229-4ubuntu21.31+esm1"
          },
          {
            "binary_name": "udev",
            "binary_version": "229-4ubuntu21.31+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "systemd",
        "purl": "pkg:deb/ubuntu/systemd@229-4ubuntu21.31+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "229-4ubuntu21.31+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "225-1ubuntu9",
        "227-2ubuntu1",
        "227-2ubuntu2",
        "228-1ubuntu2",
        "228-2ubuntu1",
        "228-2ubuntu2",
        "228-3ubuntu1",
        "228-4ubuntu1",
        "228-4ubuntu2",
        "228-5ubuntu1",
        "228-5ubuntu2",
        "228-5ubuntu3",
        "228-6ubuntu1",
        "229-1ubuntu2",
        "229-1ubuntu4",
        "229-2ubuntu1",
        "229-3ubuntu1",
        "229-3ubuntu2",
        "229-4ubuntu1",
        "229-4ubuntu4",
        "229-4ubuntu5",
        "229-4ubuntu6",
        "229-4ubuntu7",
        "229-4ubuntu8",
        "229-4ubuntu10",
        "229-4ubuntu11",
        "229-4ubuntu12",
        "229-4ubuntu13",
        "229-4ubuntu16",
        "229-4ubuntu17",
        "229-4ubuntu19",
        "229-4ubuntu20",
        "229-4ubuntu21",
        "229-4ubuntu21.1",
        "229-4ubuntu21.2",
        "229-4ubuntu21.3",
        "229-4ubuntu21.4",
        "229-4ubuntu21.5",
        "229-4ubuntu21.6",
        "229-4ubuntu21.8",
        "229-4ubuntu21.9",
        "229-4ubuntu21.10",
        "229-4ubuntu21.15",
        "229-4ubuntu21.16",
        "229-4ubuntu21.17",
        "229-4ubuntu21.19",
        "229-4ubuntu21.21",
        "229-4ubuntu21.22",
        "229-4ubuntu21.23",
        "229-4ubuntu21.27",
        "229-4ubuntu21.28",
        "229-4ubuntu21.29",
        "229-4ubuntu21.31"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss-myhostname",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "libnss-mymachines",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "libnss-resolve",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "libnss-systemd",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "libpam-systemd",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "libsystemd0",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "libudev1",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "systemd",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "systemd-container",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "systemd-coredump",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "systemd-journal-remote",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "systemd-sysv",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "systemd-tests",
            "binary_version": "237-3ubuntu10.49"
          },
          {
            "binary_name": "udev",
            "binary_version": "237-3ubuntu10.49"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "systemd",
        "purl": "pkg:deb/ubuntu/systemd@237-3ubuntu10.49?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "237-3ubuntu10.49"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "234-2ubuntu12",
        "235-2ubuntu3",
        "235-3ubuntu2",
        "235-3ubuntu3",
        "237-3ubuntu3",
        "237-3ubuntu4",
        "237-3ubuntu6",
        "237-3ubuntu7",
        "237-3ubuntu8",
        "237-3ubuntu10",
        "237-3ubuntu10.2",
        "237-3ubuntu10.3",
        "237-3ubuntu10.4",
        "237-3ubuntu10.6",
        "237-3ubuntu10.9",
        "237-3ubuntu10.11",
        "237-3ubuntu10.12",
        "237-3ubuntu10.13",
        "237-3ubuntu10.15",
        "237-3ubuntu10.17",
        "237-3ubuntu10.19",
        "237-3ubuntu10.20",
        "237-3ubuntu10.21",
        "237-3ubuntu10.22",
        "237-3ubuntu10.23",
        "237-3ubuntu10.24",
        "237-3ubuntu10.25",
        "237-3ubuntu10.26",
        "237-3ubuntu10.28",
        "237-3ubuntu10.29",
        "237-3ubuntu10.31",
        "237-3ubuntu10.33",
        "237-3ubuntu10.38",
        "237-3ubuntu10.39",
        "237-3ubuntu10.40",
        "237-3ubuntu10.41",
        "237-3ubuntu10.42",
        "237-3ubuntu10.43",
        "237-3ubuntu10.44",
        "237-3ubuntu10.45",
        "237-3ubuntu10.46",
        "237-3ubuntu10.47",
        "237-3ubuntu10.48"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss-myhostname",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "libnss-mymachines",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "libnss-resolve",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "libnss-systemd",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "libpam-systemd",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "libsystemd0",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "libudev1",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "systemd",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "systemd-container",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "systemd-coredump",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "systemd-journal-remote",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "systemd-sysv",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "systemd-tests",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "systemd-timesyncd",
            "binary_version": "245.4-4ubuntu3.10"
          },
          {
            "binary_name": "udev",
            "binary_version": "245.4-4ubuntu3.10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "systemd",
        "purl": "pkg:deb/ubuntu/systemd@245.4-4ubuntu3.10?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "245.4-4ubuntu3.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "242-7ubuntu3",
        "243-2ubuntu1",
        "243-3ubuntu1",
        "244-3ubuntu1",
        "244.1-0ubuntu2",
        "244.1-0ubuntu3",
        "244.2-1ubuntu1",
        "244.3-1ubuntu1",
        "245.2-1ubuntu1",
        "245.2-1ubuntu2",
        "245.4-2ubuntu1",
        "245.4-4ubuntu1",
        "245.4-4ubuntu3",
        "245.4-4ubuntu3.1",
        "245.4-4ubuntu3.2",
        "245.4-4ubuntu3.3",
        "245.4-4ubuntu3.4",
        "245.4-4ubuntu3.5",
        "245.4-4ubuntu3.6",
        "245.4-4ubuntu3.7"
      ]
    }
  ],
  "aliases": [],
  "details": "basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.",
  "id": "UBUNTU-CVE-2021-33910",
  "modified": "2026-04-22T07:40:05Z",
  "published": "2021-07-20T12:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33910"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5013-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5013-2"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-33910"
    }
  ],
  "related": [
    "USN-5013-1",
    "USN-5013-2"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "high",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-33910"
  ]
}



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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

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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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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.