Public Vulnerability Reports

Multiple Vendor OpenOffice QPRO Multiple Heap Overflow Vulnerabilities

17.04.08

BACKGROUND

OpenOffice is an open-source desktop office suite for many of today's popular operating systems. One of the file formats that OpenOffice supports is Quattro Pro (QPRO). This format is used by Corel's QuattroPro spreadsheet application. More information is available from the following URL.

http://www.openoffice.org/

DESCRIPTION

Remote exploitation of multiple buffer overflow vulnerabilities in OpenOffice, as included in various vendors' operating system distributions, allows attackers to execute arbitrary code with the privileges of the logged in user.

The first vulnerability occurs when parsing "Attribute" records from the file. Due to a lack of bounds checking during a loop that reads these records, an attacker can trigger a heap overflow by inserting more than 256 records.

The second vulnerability is nearly identical to the first one, but involves the "Font Description" record instead of the "Attribute" record.

ANALYSIS

Exploitation of these vulnerabilities results in the execution of arbitrary code with the privileges of the user opening the file. In order to exploit this vulnerability, an attacker must persuade a user to open a malicious file.

DETECTION

iDefense confirmed the existence of these vulnerabilities in OpenOffice version 2.3. Other versions may also be affected.

WORKAROUND

Renaming the shared library that contains the vulnerable code will prevent OpenOffice from opening QPRO files. On Fedora Core 7, the library can be found at:

 /usr/lib/openoffice.org/program/libsc680li.so 

Renaming this file to libsc680li.so.bak will prevent it from being loaded. In addition to preventing the use of QPRO files, this also prevents users from opening various other file formats.

VENDOR RESPONSE

The OpenOffice.org team has addressed these vulnerabilities with the release of version 2.4. For more information, consult the OOo Security Bulletin at the following URL.

http://www.openoffice.org/security/cves/CVE-2007-5745.html

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-5745 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

10/29/2007 Initial vendor notification
10/30/2007 Initial vendor response
04/17/2008 Coordinated public disclosure

CREDIT

These vulnerabilities were discovered by Sean Larsson (iDefense Labs) and an anonymous researcher.

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LEGAL NOTICES

Copyright © 2008 Verisign, Inc.

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