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Linux Kernel "vmi_write_ldt_entry()" Privilege Escalation

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Release Date:  2008-10-03    Last Update:  2008-10-09    Views:  7,737

Secunia Advisory SA32124

Where:

Local system

Impact:

Privilege escalation, DoS

Solution Status:

Vendor Workaround

Operating System:

CVE Reference(s):

Description


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

The vulnerability is caused due to an error within the "vmi_write_ldt_entry()" function in arch/x86/kernel/vmi_32.c. This can be exploited to write values into the IDT by e.g. calling "sys_modify_ldt()".

Successful exploitation requires that the kernel is running as VMI guest on a x86 system.


Solution:
Fixed in the GIT repository.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Eugene Teo, Red Hat

Original Advisory:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=de59985e3a623d4d5d6207f1777398ca0606ab1c

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 "vmi_write_ldt_entry()" Privilege Escalation

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