[ GLSA 200707-04 ] GNU C Library: Integer overflow

2007-07-0400:00:00

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Gentoo Linux Security Advisory GLSA 200707-04

                                        http://security.gentoo.org/

Severity: Normal
Title: GNU C Library: Integer overflow
Date: July 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
-------------------------------------------------------------------

1 sys-libs/glibc < 2.5-r4 >= 2.5-r4
-------------------------------------------------------------------
# Package 1 only applies to x86 users.

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 &quot;&gt;=sys-libs/glibc-2.5-r4&quot;

References

[ 1 ] CVE-2007-3508
http://cve.mitre.org/cgi-bin/cvename.cgi?name=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
[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.