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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel execve() Bug May Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1022960
SecurityTracker URL:  http://securitytracker.com/id/1022960
CVE Reference:   CVE-2009-2848   (Links to External Site)
Date:  Sep 30 2009
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.6.32-rc1
Description:   A vulnerability was reported in the Linux Kernel. A local user may be able to obtain elevated privileges on the target system.

The execve() function does not properly clear the current->clear_child_tid pointer. A local user can exploit this by issuing a clone system call with CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID enabled to trigger a memory corruption error.

Impact:   A local user may be able to obtain elevated privileges on the target system.
Solution:   The vendor has issued a fix, available at:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=9c8a8228d0827e0d91d28527209988f672f97d28

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 30 2009 (Red Hat Issues Fix) Linux Kernel execve() Bug May Let Local Users Gain Elevated Privileges
Red Hat has released a fix for Red Hat Enterprise Linux 5.3 Extended Update Support.
Nov 4 2009 (Red Hat Issues Fix) Linux Kernel execve() Bug May Let Local Users Gain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 3.



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