ubuntu-cve-2018-7738
Vulnerability from osv_ubuntu
Published
2018-03-07 02:29
Modified
2026-04-22 07:38
Summary
Details

In util-linux before 2.32-rc1, bash-completion/umount allows local users to gain privileges by embedding shell commands in a mountpoint name, which is mishandled during a umount command (within Bash) by a different user, as demonstrated by logging in as root and entering umount followed by a tab character for autocompletion.

Severity
7.8 (High)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
negligible
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bsdutils",
            "binary_version": "1:2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "fdisk",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "libblkid1",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "libfdisk1",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "libmount1",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "libsmartcols1",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "libuuid1",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "mount",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "rfkill",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "setpriv",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "util-linux",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "util-linux-locales",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          },
          {
            "binary_name": "uuid-runtime",
            "binary_version": "2.31.1-0.4ubuntu3.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "util-linux",
        "purl": "pkg:deb/ubuntu/util-linux@2.31.1-0.4ubuntu3.7?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.31.1-0.4ubuntu3.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.30.1-0ubuntu4",
        "2.30.2-0.1ubuntu1",
        "2.30.2-0.1ubuntu2",
        "2.30.2-0.1ubuntu3",
        "2.31.1-0.4ubuntu2",
        "2.31.1-0.4ubuntu3",
        "2.31.1-0.4ubuntu3.1",
        "2.31.1-0.4ubuntu3.2",
        "2.31.1-0.4ubuntu3.3",
        "2.31.1-0.4ubuntu3.4",
        "2.31.1-0.4ubuntu3.5",
        "2.31.1-0.4ubuntu3.6"
      ]
    }
  ],
  "aliases": [],
  "details": "In util-linux before 2.32-rc1, bash-completion/umount allows local users to gain privileges by embedding shell commands in a mountpoint name, which is mishandled during a umount command (within Bash) by a different user, as demonstrated by logging in as root and entering umount followed by a tab character for autocompletion.",
  "id": "UBUNTU-CVE-2018-7738",
  "modified": "2026-04-22T07:38:34Z",
  "published": "2018-03-07T02:29:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-7738"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4512-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2018-7738"
    }
  ],
  "related": [
    "USN-4512-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "negligible",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2018-7738"
  ]
}



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