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Linux Kernel "tun_char_poll()" NULL Pointer Dereference

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Release Date:  2009-07-17    Last Update:  2009-07-20    Views:  4,913

Secunia Advisory SA35839

Where:

Local system

Impact:

Privilege escalation, DoS

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

Description


A vulnerability has been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and potentially gain escalated privileges.

The vulnerability is caused due to a potential NULL pointer dereference within the "tun_chr_poll()" function in drivers/net/tun.c. This can be exploited to cause a crash and potentially execute arbitrary code with root privileges by opening and polling a tun device.

Successful exploitation requires that the kernel was e.g. compiled with GCC's "-fdelete-null-pointer-checks" optimisation.

The vulnerability is reported in version 2.6.30.


Solution:
Update to version 2.6.30.2.

Provided and/or discovered by:
Eugene Kapun.

Additional information provided by Brad Spengler.

Original Advisory:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.30.2

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Linux Kernel "tun_char_poll()" NULL Pointer Dereference

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