GLSA 200707-04: GNU C Library: Integer overflow

http://security.gentoo.org/

Severity:	normal
Title:	GNU C Library: Integer overflow
Date:	07/03/2007
Bugs:	#183844
ID:	200707-04

Synopsis

An integer overflow in the dynamic loader, ld.so, could result in the execution of arbitrary code with escalated privileges.

Background

The GNU C library is the standard C library used by Gentoo Linux systems. It provides programs with basic facilities and interfaces to system calls. ld.so is the dynamic linker which prepares dynamically linked programs for execution by resolving runtime dependencies and related functions.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
sys-libs/glibc	< 2.5-r4	>= 2.5-r4	x86

Description

Tavis Ormandy of the Gentoo Linux Security Team discovered a flaw in the handling of the hardware capabilities mask by the dynamic loader. If a mask is specified with a high population count, an integer overflow could occur when allocating memory.

Impact

As the hardware capabilities mask is honored by the dynamic loader during the execution of suid and sgid programs, in theory this vulnerability could result in the execution of arbitrary code with root privileges. This update is provided as a precaution against currently unknown attack vectors.

Workaround

There is no known workaround at this time.

Resolution

All users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-libs/glibc-2.5-r4"

References

CVE-2007-3508

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200707-04.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.