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TITLE:
Linux Kernel ptrace Local Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA26934

VERIFY ADVISORY:
http://secunia.com/advisories/26934/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

REVISION:
1.1 originally posted 2007-09-24

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

DESCRIPTION:
Wojciech Purczynski has reported a vulnerability in the Linux kernel,
which can be exploited by malicious, local users to gain escalated
privileges.

The vulnerability is caused due to the kernel not zero-extending
x86_64 registers after ptrace in the 32bit entry path in 
arch/x86_64/ia32/ia32entry.S on x86_64 platforms.

The vulnerability is reported in versions prior to 2.4.35.3 and
2.6.22.7.

Note: A problem in the ATM module, which can cause a kernel panic,
has also been reported by Gilles Espinasse.

SOLUTION:
Update to version 2.4.35.3 or 2.6.22.7.

PROVIDED AND/OR DISCOVERED BY:
Wojciech Purczynski

CHANGELOG:
2007-09-24: Updated "Description".

ORIGINAL ADVISORY:
http://kernel.org/pub/linux/kernel/v2.4/ChangeLog-2.4.35.3
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.22.7

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