CVE-2012-6711 Information

Description

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().

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://git.savannah.gnu.org/cgit/bash.git/commit/?h=devel&id=863d31ae775d56b785dc5b0105b6d251515d81d5 http://www.securityfocus.com/bid/108824 https://bugzilla.redhat.com/show_bug.cgi?id=1721071 https://support.f5.com/csp/article/K05122252 https://support.f5.com/csp/article/K05122252?utm_source=f5support&utm_medium=RSS https://usn.ubuntu.com/4180-1/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8