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Ingres Database for Linux verifydb Insecure File Permissions Modification Vulnerability

01.08.08

BACKGROUND

Ingres Database is a database server used in several Computer Associates' products. For example, CA Directory Service uses the Ingres Database server. More information can be found on the vendor's website at the following URL.

http://ingres.com/downloads/prod-cert-download.php

DESCRIPTION

Local exploitation of a file permissions modification vulnerability in the "verifydb" utility, as included with Ingres Database 2006 Release 2 for Linux, allows attackers to modify the permissions of files owned by the Ingres database user.

The vulnerability exists within the "verifydb" utility included with Ingres. It is used to cleanup unneeded files created in the database directory. This program has the set-uid bit set, and is owned by the "ingres" user.

The "verifydb" program improperly changes the permissions on files. The program first creates a file called "iivdb.log" in the current directory, and then makes it world writable. By creating a symbolic link to a file owned by the "ingres" user, an attacker can gain write access to the target file.

ANALYSIS

Exploitation of this vulnerability allows an attacker to overwrite arbitrary files owned by the "ingres" user. By itself, this vulnerability does not have very serious consequences. However, when combined with the library loading vulnerability, it allows an attacker to execute arbitrary code with root privileges.

DETECTION

iDefense has confirmed the existence of this vulnerability in Ingres 2006 Enterprise Edition Release 2 for Linux x86 (32-bit). Other versions may also be affected.

WORKAROUND

iDefense is currently unaware of any workaround for this issue.

VENDOR RESPONSE

"This problem has been identified and resolved by Ingres in the following releases: Ingres 2006 release 2 (9.1.0), Ingres 2006 release 1 (9.0.4), and Ingres 2.6."

For more information, refer to Ingres' advisory at the following URL.

http://www.ingres.com/support/security-alert-080108.php

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-3356 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

07/20/2007 Initial vendor response
07/23/2007 Initial vendor notification
08/01/2008 Coordinated public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2008 Verisign, Inc.

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