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CVE-2012-6711

Published: 18 June 2019

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().

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
bash
Launchpad, Ubuntu, Debian
cosmic Not vulnerable

bionic Not vulnerable
(4.4.18-2ubuntu1.1)
disco Not vulnerable

eoan Not vulnerable

trusty Not vulnerable
(4.3.7ubuntu1.8)
upstream
Released (4.3-1)
xenial Not vulnerable
(4.3-14ubuntu1.3)
Patches:
upstream: http://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=863d31ae775d56b785dc5b0105b6d251515d81d5

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H