ubuntu-cve-2019-20373
Vulnerability from osv_ubuntu
Published
2020-01-09 23:15
Modified
2025-10-24 04:48
Summary
Details

LTSP LDM through 2.18.06 allows fat-client root access because the LDM_USERNAME variable may have an empty value if the user's shell lacks support for Bourne shell syntax. This is related to a run-x-session script.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/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": "ldm",
            "binary_version": "2:2.2.18-1"
          },
          {
            "binary_name": "ldm-server",
            "binary_version": "2:2.2.18-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "ldm",
        "purl": "pkg:deb/ubuntu/ldm@2:2.2.18-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:2.2.17-1",
        "2:2.2.18-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ldm",
            "binary_version": "2:2.2.19-1"
          },
          {
            "binary_name": "ldm-server",
            "binary_version": "2:2.2.19-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "ldm",
        "purl": "pkg:deb/ubuntu/ldm@2:2.2.19-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:2.2.18-2",
        "2:2.2.19-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ldm",
            "binary_version": "2:2.18.06-1+deb10u1build0.20.04.1"
          },
          {
            "binary_name": "ldm-server",
            "binary_version": "2:2.18.06-1+deb10u1build0.20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "ldm",
        "purl": "pkg:deb/ubuntu/ldm@2:2.18.06-1+deb10u1build0.20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:2.18.06-1+deb10u1build0.20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:2.18.06-1"
      ]
    }
  ],
  "aliases": [],
  "details": "LTSP LDM through 2.18.06 allows fat-client root access because the LDM_USERNAME variable may have an empty value if the user\u0027s shell lacks support for Bourne shell syntax. This is related to a run-x-session script.",
  "id": "UBUNTU-CVE-2019-20373",
  "modified": "2025-10-24T04:48:08Z",
  "published": "2020-01-09T23:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2019-20373"
    },
    {
      "type": "REPORT",
      "url": "https://git.launchpad.net/~ltsp-upstream/ltsp/+git/ldm/commit/?id=c351ac69ef63ed6c84221cef73e409059661b8ba"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.launchpad.net/ubuntu/+source/ldm/+bug/1839431"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4533-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2019-20373"
    }
  ],
  "related": [
    "USN-4533-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2019-20373"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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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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