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IBM DB2 Universal Database Administration Server File Creation Vulnerability
iDefense Security Advisory 04.09.08: IBM DB2 Universal Database Administration Server File Creation Vulnerability
iDefense Security Advisory 04.09.08: IBM DB2 Universal Database Administration Server File Creation Vulnerability

iDefense Security Advisory 04.09.08 
Apr 09, 2008


IBM Corp.'s DB2 Universal Database product is a large database server
product commonly used for high-end databases. The DB2 Administration
Server (DAS) implements the server component to which the Java-based
DB2 Control Center GUI connects. For more information, visit the
product website at the following URL. 


Local exploitation of a file creation vulnerability in the
Administration Server of IBM Corp.'s DB2 Universal Database allows
attackers to elevate privileges to root.

This vulnerability exists due to unsafe file access from within the
db2dasrrm program. When a user starts the DAS, the "db2dasrrm" process
is started with root privileges. As part of the initialization, the
"dasRecoveryIndex", "dasRecoveryIndex.tmp", ".dasRecoveryIndex.lock",
and "dasRecoveryIndex.cor" files are created with root privileges. By
removing and re-creating these files as symbolic links, an attacker can
create arbitrary files as root.


Exploitation allows local attackers to gain root privileges. In order to
exploit this vulnerability, an attacker must have access to an account
that is allowed to start and stop the DB2 Administration Server. For
example, the "dasusr1" account or an account with access to the
"db2adm1" group.

It should be noted that an attacker does not appear to any control over
the contents of the data written. However, this does not significantly
impact exploitation since the file is created using the user's umask
and group.


iDefense has confirmed the existence of this vulnerability in IBM
Corp.'s DB2 Universal Database 9.1 release with Fix Pack 3 installed on
Linux. Other versions are also suspected to be vulnerable.


iDefense is currently unaware of any effective workaround for this


IBM Corp. has addressed this vulnerability with the release of V9.1 Fix
Pack 4a, V8 FixPak 16, and V9.5 Fix Pack 1 of its Universal Database
product. More information can be found at the following URLs.





The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-5664 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for 
security problems.


10/03/2007  Initial vendor notification
10/16/2007  Initial vendor response
04/09/2008  Coordinated public disclosure


This vulnerability was discovered by Joshua J. Drake (iDefense Labs).

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Copyright =A9 2008 iDefense, Inc.

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Disclaimer: The information in the advisory is believed to be accurate
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