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TITLE:
Linux Kernel IA32 Compatibility "execve()" Buffer Overflow

SECUNIA ADVISORY ID:
SA15980

VERIFY ADVISORY:
http://secunia.com/advisories/15980/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/
Linux Kernel 2.4.x
http://secunia.com/product/763/

DESCRIPTION:
Ilja van Sprundel has reported a vulnerability in the Linux kernel,
which can be exploited by malicious, local users to cause a DoS
(Denial of Service) or potentially gain escalated privileges.

The vulnerability is caused due to a race condition in the
compatibility code for "execve()" on the IA64 and AMD64 platforms
that occurs when counting and copying arguments from user-space to
kernel-space.

Successful exploitation crashes the kernel and may allow execution of
arbitrary code with escalated privileges.

The vulnerability has been reported in versions 2.4.31 and prior, and
in versions 2.6.6 and prior.

SOLUTION:
The vulnerability has been fixed in versions 2.4.32-pre1 and 2.6.7.

PROVIDED AND/OR DISCOVERED BY:
Ilja van Sprundel, Suresec.

ORIGINAL ADVISORY:
Kernel.org:
http://www.kernel.org/pub/linux/kernel/v2.4/testing/patch-2.4.32.log

Suresec:
http://www.suresec.org/advisories/adv4.pdf

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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http://secunia.com/about_secunia_advisories/


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