[UNIX] IBM DB2 Universal Database Multiple Privilege Escalation Vulnerabilities



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IBM DB2 Universal Database Multiple Privilege Escalation Vulnerabilities
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SUMMARY

IBM Corp.'s <http://ibm.com/db2/> DB2 Universal Database product is a
large database server product commonly used for higher end databases.

Local exploitation of a multiple vulnerabilities in IBM Corp.'s DB2
Universal Database allow attackers to cause a denial of service condition
or elevate privileges to root.

DETAILS

Vulnerable Systems:
* IBM Corp.'s DB2 Universal Database 9.1 release installed on Linux.
* Other versions, including those installed on other architectures, are
suspected to be vulnerable as well.
* These vulnerabilities do not appear to affect DB2 Universal Database
running on the windows platform.

Several vulnerabilities exist due to unsafe file access from within
several setuid-root binaries. Specifically, when supplying certain
environment variables, the DB2 administration binaries will use the
specified filename for saving data. This allows an attacker to create or
append to arbitrary files as root.

A heap-based buffer overflow vulnerability can occur when copying data
from an environment variable. The variable contents are copied to a static
BSS segment buffer without ensuring proper NUL termination. Consequently,
this allows an attacker to cause a heap overflow in a later function call.

A stack-based buffer overflow can occur when an environment variable
contains a long string. By specifying a specially crafted value, it is
possible to overwrite the return address of a function and execute
arbitrary code.

Successful exploitation allows a local attacker to cause a denial of
service condition or potentially gain root privileges.

In some cases, the attacker does not appear to have any control over the
contents of the data written to disk. If this is true, then privilege
escalation could only occur via another bug where the existence of
specially crafted file name allows code execution. Denial of service is
trivial by writing to /etc/nologin or corrupting other system files.

Workaround:
The best defense against these vulnerabilities is to prevent untrusted
users from having code execution abilities on the respective database
server. The following workarounds also have value.

Use a more strict permissions setting for the DB2 instance directory would
prevent non-instance users from accessing the setuid-root binaries.

Remove the setuid bit from all programs included with DB2.

These configuration changes have not been tested and may cause adverse
behavior.

Vendor Status:
IBM Corp. has addressed this vulnerability within IBM Universal Database
DB2 9 Fixpack 2. For more information, consult the corresponding IBM APAR
#IY94833 by visiting the following URL.
<http://www-1.ibm.com/support/docview.wss?uid=swg21255747>
http://www-1.ibm.com/support/docview.wss?uid=swg21255747

Disclosure Timeline:
* 11/15/2006 - Initial vendor notification
* 01/29/2007 - Initial vendor response
* 02/22/2007 - Coordinated public disclosure


ADDITIONAL INFORMATION

The information has been provided by iDefense.
The original article can be found at:

<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=481>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=481



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