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Secunia Security Advisory 26935

Secunia Security Advisory 26935
Posted Sep 25, 2007
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Evan Teran has reported a security issue in the Linux kernel, which potentially can be exploited by malicious, local users to cause a DoS (Denial of Service).

tags | advisory, denial of service, kernel, local
systems | linux
SHA-256 | 08ea98b81e84063950469d328e2cb4c952221fcd083d25b07a1ee164cbfa7120

Secunia Security Advisory 26935

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TITLE:
Linux Kernel ptrace Single Step "CS" Null Pointer Dereference

SECUNIA ADVISORY ID:
SA26935

VERIFY ADVISORY:
http://secunia.com/advisories/26935/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

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

DESCRIPTION:
Evan Teran has reported a security issue in the Linux kernel, which
potentially can be exploited by malicious, local users to cause a DoS
(Denial of Service).

The vulnerability is caused due to an error in ptrace when
single-stepping a debugged child process with invalid values in the
"CS" register, which can be exploited to cause a kernel oops.

SOLUTION:
Fixed in the GIT repository.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=29eb51101c02df517ca64ec472d7501127ad1da8
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a10d9a71bafd3a283da240d2868e71346d2aef6f

PROVIDED AND/OR DISCOVERED BY:
Evan Teran

ORIGINAL ADVISORY:
http://bugzilla.kernel.org/show_bug.cgi?id=8765

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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.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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