ubuntu-cve-2021-44512
Vulnerability from osv_ubuntu
Published
2021-12-07 03:15
Modified
2026-05-20 14:53
Summary
Details

World-writable permissions on the /tmp/tmate/sessions directory in tmate-ssh-server 2.3.0 allow a local attacker to compromise the integrity of session handling, or obtain the read-write session ID from a read-only session symlink in this directory.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tmate-ssh-server",
            "binary_version": "2.3.0-49-g97d20249-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "tmate-ssh-server",
        "purl": "pkg:deb/ubuntu/tmate-ssh-server@2.3.0-49-g97d20249-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.0-49-g97d20249-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tmate-ssh-server",
            "binary_version": "2.3.0-68-gd7334ee4-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "tmate-ssh-server",
        "purl": "pkg:deb/ubuntu/tmate-ssh-server@2.3.0-68-gd7334ee4-1build1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.0-68-gd7334ee4-1",
        "2.3.0-68-gd7334ee4-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tmate-ssh-server",
            "binary_version": "2.3.0-68-gd7334ee4-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "tmate-ssh-server",
        "purl": "pkg:deb/ubuntu/tmate-ssh-server@2.3.0-68-gd7334ee4-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.0-68-gd7334ee4-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tmate-ssh-server",
            "binary_version": "2.3.0-68-gd7334ee4-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "tmate-ssh-server",
        "purl": "pkg:deb/ubuntu/tmate-ssh-server@2.3.0-68-gd7334ee4-2build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.0-68-gd7334ee4-2",
        "2.3.0-68-gd7334ee4-2build1"
      ]
    }
  ],
  "aliases": [],
  "details": "World-writable permissions on the /tmp/tmate/sessions directory in tmate-ssh-server 2.3.0 allow a local attacker to compromise the integrity of session handling, or obtain the read-write session ID from a read-only session symlink in this directory.",
  "id": "UBUNTU-CVE-2021-44512",
  "modified": "2026-05-20T14:53:37Z",
  "published": "2021-12-07T03:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-44512"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2021/12/06/2"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1189388"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tmate-io/tmate-ssh-server/commit/1c020d1f5ca462f5b150b46a027aaa1bbe3c9596"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-44512"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-44512"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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