ubuntu-cve-2012-6711
Vulnerability from osv_ubuntu
Published
2019-06-18 18:15
Modified
2025-07-16 04:50
Summary
Details

A heap-based buffer overflow exists in GNU Bash before 4.3 when wide characters, not supported by the current locale set in the LC_CTYPE environment variable, are printed through the echo built-in function. A local attacker, who can provide data to print through the "echo -e" built-in function, may use this flaw to crash a script or execute code with the privileges of the bash process. This occurs because ansicstr() in lib/sh/strtrans.c mishandles u32cconv().

Severity
7.8 (High)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0 (High)
CVSS:3.0/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": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bash",
            "binary_version": "4.3-14ubuntu1.3"
          },
          {
            "binary_name": "bash-builtins",
            "binary_version": "4.3-14ubuntu1.3"
          },
          {
            "binary_name": "bash-dbgsym",
            "binary_version": "4.3-14ubuntu1.3"
          },
          {
            "binary_name": "bash-doc",
            "binary_version": "4.3-14ubuntu1.3"
          },
          {
            "binary_name": "bash-static",
            "binary_version": "4.3-14ubuntu1.3"
          },
          {
            "binary_name": "bash-static-dbgsym",
            "binary_version": "4.3-14ubuntu1.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "bash",
        "purl": "pkg:deb/ubuntu/bash@4.3-14ubuntu1.3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3-14ubuntu1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3-14ubuntu1",
        "4.3-14ubuntu1.1",
        "4.3-14ubuntu1.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bash",
            "binary_version": "4.4.18-2ubuntu1.1"
          },
          {
            "binary_name": "bash-builtins",
            "binary_version": "4.4.18-2ubuntu1.1"
          },
          {
            "binary_name": "bash-builtins-dbgsym",
            "binary_version": "4.4.18-2ubuntu1.1"
          },
          {
            "binary_name": "bash-dbgsym",
            "binary_version": "4.4.18-2ubuntu1.1"
          },
          {
            "binary_name": "bash-doc",
            "binary_version": "4.4.18-2ubuntu1.1"
          },
          {
            "binary_name": "bash-static",
            "binary_version": "4.4.18-2ubuntu1.1"
          },
          {
            "binary_name": "bash-static-dbgsym",
            "binary_version": "4.4.18-2ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "bash",
        "purl": "pkg:deb/ubuntu/bash@4.4.18-2ubuntu1.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.4.18-2ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.4-5ubuntu1",
        "4.4.18-1ubuntu1",
        "4.4.18-2ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "A heap-based buffer overflow exists in GNU Bash before 4.3 when wide characters, not supported by the current locale set in the LC_CTYPE environment variable, are printed through the echo built-in function. A local attacker, who can provide data to print through the \"echo -e\" built-in function, may use this flaw to crash a script or execute code with the privileges of the bash process. This occurs because ansicstr() in lib/sh/strtrans.c mishandles u32cconv().",
  "id": "UBUNTU-CVE-2012-6711",
  "modified": "2025-07-16T04:50:11Z",
  "published": "2019-06-18T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2012-6711"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4180-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2012-6711"
    }
  ],
  "related": [
    "USN-4180-1"
  ],
  "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": "CVSS:3.0/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-2012-6711"
  ],
  "withdrawn": "2025-07-18T16:42:48Z"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.