Arch Linux: ASA-201411-27 Medium Severity Glibc Command Execution

Arch Linux Security Advisory ASA-201411-27
=========================================
Severity: Medium
Date    : 2014-11-21
CVE-ID  : CVE-2014-7817
Package : glibc
Type    : command execution
Remote  : No
Link    : https://wiki.archlinux.org/title/CVE-2014

Summary
======
The package glibc before version 2.20-3 is vulnerable to command execution.

Resolution
=========
Upgrade to 2.20-3.

# pacman -Syu "glibc>=2.20-3"

The problem has been fixed upstream but there has been no new release yet.

Workaround
=========
None.

Description
==========
The wordexp function could ignore the WRDE_NOCMD flag under certain
input conditions resulting in the execution of a shell for command
substitution when the application did not request it. The implementation
now checks WRDE_NOCMD immediately before executing the shell and returns
the error WRDE_CMDSUB as expected.

Impact
=====
An attacker may be able to force arbitrary commands to be executed by an
application using the wordexp function.

References
=========
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-7817
https://sourceware.org/bugzilla/show_bug.cgi?id=17625
https://seclists.org/oss-sec/2014/q4/730