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Category:   OS (UNIX)  >   IBM AIX Vendors:   IBM
IBM AIX libc MALLOCDEBUG File Overwrite Bug Lets Local Users Gain Root Privileges
SecurityTracker Alert ID:  1022261
SecurityTracker URL:  http://securitytracker.com/id/1022261
CVE Reference:   CVE-2009-1786   (Links to External Site)
Updated:  May 28 2009
Original Entry Date:  May 20 2009
Impact:   Modification of system information, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.3, 6.1
Description:   A vulnerability was reported in IBM AIX. A local user can obtain root privileges on the target system.

A local user can exploit a race condition in the MALLOCDEBUG debugging component of the malloc subsystem in the 'libc.a' library to overwrite arbitrary files on the target system.

The following libraries are affected:

/usr/ccs/lib/libc.a
/usr/ccs/lib/libp/libc.a

iDefense Labs reported this vulnerability.

Impact:   A local user can obtain root privileges on the target system.
Solution:   The vendor has issued the following APARs (with availability date):

5.3.0 IZ50500 07/01/09
5.3.7 IZ50517 07/01/09
5.3.8 IZ50447 07/01/09
5.3.9 IZ50445 07/01/09
6.1.0 IZ50139 06/03/09
6.1.1 IZ50129 06/03/09
6.1.2 IZ50121 06/03/09

The APARs are available at:

http://www.ibm.com/support/docview.wss?uid=isg1IZ50500
http://www.ibm.com/support/docview.wss?uid=isg1IZ50517
http://www.ibm.com/support/docview.wss?uid=isg1IZ50447
http://www.ibm.com/support/docview.wss?uid=isg1IZ50445
http://www.ibm.com/support/docview.wss?uid=isg1IZ50139
http://www.ibm.com/support/docview.wss?uid=isg1IZ50129
http://www.ibm.com/support/docview.wss?uid=isg1IZ50121

The vendor's advisory is available at:

http://aix.software.ibm.com/aix/efixes/security/libc_advisory.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/libc_advisory.asc (Links to External Site)
Cause:   Access control error, State error

Message History:   None.


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