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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel uselib() Race Condition Lets Local Users Obtain Root Level Privileges
SecurityTracker Alert ID:  1012810
SecurityTracker URL:  http://securitytracker.com/id/1012810
CVE Reference:   CVE-2004-1235   (Links to External Site)
Date:  Jan 7 2005
Impact:   Root access via local system
Exploit Included:  Yes  
Version(s): 2.4 up to and including 2.4.29-rc2, 2.6 up to and including 2.6.10
Description:   A vulnerability was reported in the Linux kernel in the uselib() functions. A local user can obtain root privileges.

Paul Starzetz of iSEC Security Research reported that the Linux binary format loader load_elf_library() function in 'binfmt_elf.c' does not properly process memory segments. A do_brk() call is made without holding the relevant mmap semaphore. As a result, a local user can exploit a race condition to inject a virtual memory address descriptor into the wrong location and cause arbitrary code to be executed with root privileges.

The binfmt_aout binary format loader contains a similar flaw.

The original advisory is available at:

http://www.isec.pl/vulnerabilities/isec-0021-uselib.txt

Impact:   A local user can obtain root privileges.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error

Message History:   None.


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