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 Windows Enhanced Metafile (EMF). EMF files are used to render images. More information is available from the following URL.
Remote exploitation of an integer overflow vulnerability 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 vulnerability exists within the code responsible for parsing the EMR_STRETCHBLT record in an EMF file. This code reads in two 32-bit integers from the file, and then uses them in an arithmetic operation that calculates the number of bytes to allocate for a dynamic buffer. This calculation can overflow, resulting in an insufficiently sized buffer being allocated. Subsequently, this buffer is overflowed with data from the file.
Exploitation of this vulnerability 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.
iDefense confirmed the existence of this vulnerability in OpenOffice version 2.3. Other versions may also be affected.
iDefense is currently unaware of any workarounds for this issue.
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.
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-5746 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.
10/29/2007 Initial vendor notification
10/30/2007 Initial vendor response
04/17/2008 Coordinated public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
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