UBUNTU-CVE-2023-4911 (CVE-2023-4911)

Vulnerability from osv_ubuntu – Published: 2023-10-03 17:00 – Updated: 2026-04-22 07:45 – Source website
VLAI
Details

A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "glibc-source",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc-bin",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc-dev-bin",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc-devtools",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6-amd64",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6-dev-amd64",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6-dev-i386",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6-dev-s390",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6-dev-x32",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6-i386",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6-prof",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6-s390",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "libc6-x32",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "locales",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "locales-all",
            "binary_version": "2.35-0ubuntu3.4"
          },
          {
            "binary_name": "nscd",
            "binary_version": "2.35-0ubuntu3.4"
          }
        ],
        "priority_reason": "Local privilege escalation in a package that is installed on all Ubuntu instances."
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "glibc",
        "purl": "pkg:deb/ubuntu/glibc@2.35-0ubuntu3.4?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.35-0ubuntu3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.34-0ubuntu3",
        "2.35-0ubuntu1",
        "2.35-0ubuntu3",
        "2.35-0ubuntu3.1",
        "2.35-0ubuntu3.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "glibc-source",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc-bin",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc-dev-bin",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc-devtools",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6-amd64",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6-dev-amd64",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6-dev-i386",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6-dev-s390",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6-dev-x32",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6-i386",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6-prof",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6-s390",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "libc6-x32",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "locales",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "locales-all",
            "binary_version": "2.38-1ubuntu6"
          },
          {
            "binary_name": "nscd",
            "binary_version": "2.38-1ubuntu6"
          }
        ],
        "priority_reason": "Local privilege escalation in a package that is installed on all Ubuntu instances."
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "glibc",
        "purl": "pkg:deb/ubuntu/glibc@2.38-1ubuntu6?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.38-1ubuntu6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "details": "A buffer overflow was discovered in the GNU C Library\u0027s dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.",
  "id": "UBUNTU-CVE-2023-4911",
  "modified": "2026-04-22T07:45:07Z",
  "published": "2023-10-03T17:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-4911"
    },
    {
      "type": "REPORT",
      "url": "https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6409-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-4911"
    },
    {
      "type": "REPORT",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
    }
  ],
  "related": [
    "USN-6409-1"
  ],
  "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": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "high",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-4911"
  ]
}



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