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Linux Kernel Denial of Service and Privilege Escalation Vulnerabilities

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Release Date:  2010-10-14    Last Update:  2010-10-21    Views:  3,247

Secunia Advisory SA41693

Where:

Local system

Impact:

Privilege escalation, DoS

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

Description


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

1) An error in the i915 GEM ioctl interface can be exploited to write to an arbitrary kernel memory location.

2) An error within the "get_microcode32()" function in drivers/media/video/v4l2-compat-ioctl32.c can be exploited to gain escalated privileges via specially crafted IOCTLs.

Note: Successful exploitation requires a 64bit system and access to a video device.

3) KVM loads the host's FS and GS registers without additional verification, which can be exploited to e.g. cause a kernel panic by modifying the LDT and sending a KVM_RUN IOCTL.


Solution:
Update to version 2.6.36.

Provided and/or discovered by:
1, 2) Kees Cook
3) Disclosed in a GIT commit.

Original Advisory:
1)http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.36-rc7
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ce9d419dbecc292cc3e06e8b1d6d123d3fa813a4
2) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=3e645d6b485446c54c6745c5e2cf5c528fe4deec
http://www.outflux.net/blog/archives/2010/10/19/cve-2010-2963-v4l-compat-exploit/
3) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=9581d442b9058d3699b4be568b6e5eae38a41493

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 Denial of Service and Privilege Escalation Vulnerabilities

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