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TITLE:
Linux Kernel "vmi_write_ldt_entry()" Privilege Escalation

SECUNIA ADVISORY ID:
SA32124

VERIFY ADVISORY:
http://secunia.com/advisories/32124/

CRITICAL:
Less critical

IMPACT:
Privilege escalation, DoS

WHERE:
Local system

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

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

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

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