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Linux Kernel ptrace Single Step "CS" Null Pointer Dereference Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA26935  
Release Date: 2007-09-25

Critical:
Not critical
Impact: DoS
Where: Local system
Solution Status: Vendor Workaround

OS:Linux Kernel 2.6.x


CVE reference:CVE-2007-3731 (Secunia mirror)



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...b51101c02df517ca64ec472d7501127ad1da8
http://git.kernel.org/?p=linux/kernel...d9a71bafd3a283da240d2868e71346d2aef6f

Provided and/or discovered by:
Evan Teran

Original Advisory:
http://bugzilla.kernel.org/show_bug.cgi?id=8765



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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