[ GLSA 201309-21 ] klibc: Command Injection

[GLSA]

Gentoo Linux Security Advisory

Title: klibc: Command Injection (GLSA 201309-21)
Severity: normal
Exploitable: remote
Date: September 26, 2013
Bug(s): #369075
ID: 201309-21

Synopsis

A vulnerability in klibc could allow remote attackers to execute
arbitrary shell code.


Background

klibc is a minimalistic libc used for making an initramfs.

Affected Packages

Package: dev-libs/klibc
Vulnerable: < 1.5.25
Unaffected: >= 1.5.25
Architectures: All supported architectures


Description

The ipconfig utility in klibc writes DHCP options to
/tmp/net-$DEVICE.conf, and this file is later sourced by other scripts to
get defined variables. The options written to this file are not properly
escaped.


Impact

A remote attacker could send a specially crafted DHCP reply, which could
execute arbitrary shell code with the privileges of any process which
sources DHCP options.


Workaround

There is no known workaround at this time.

Resolution

All klibc users should upgrade to the latest version: