[UNIX] Multiple Vendor libwpd Multiple Buffer Overflow Vulnerabilities

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Multiple Vendor libwpd Multiple Buffer Overflow Vulnerabilities
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SUMMARY

<http://libwpd.sourceforge.net/> libwpd is a C++ library used to decode
and encode word perfect documents. It is commonly used as a plug-in in
word processing utilities such as Open Office and Abiword. For more
information please visit the following URL.

Remote exploitation of multiple buffer overflow vulnerabilities in libwpd,
as included in various vendors' operating system distributions, could
allow an attacker to execute arbitrary code.

DETAILS

Vulnerable Systems:
* libwpd version 0.8.7.
* Previous versions may also be affected.
Note: This library is used by applications such as Abiword, Kword, and
Open Office.

One problem specifically exists in the WP6GeneralTextPacket::_readContents
function. This function reads in a series of integer values and sums them.
This sum is then used to allocate a block of memory from the heap. The
function then copies data from the file into the buffer using each operand
from the addition as the number of bytes to copy. The summing operation
leads to an integer overflow, and the buffer can then be overflowed by the
copy operations.

Two additional problems exist in the WP3TablesGroup::_readContents() and
WP5DefinitionGroup_DefineTablesSubGroup::WP5DefinitionGroup_DefineTablesSubGroup() functions. These functions read an integer value from an attacker supplied file, and uses the value as a loop counter. In the loop a statically sized buffer is filled with arbitrary data from the file. This leads to an exploitable heap overflow.

Successful exploitation of these vulnerabilities requires an attacker to
persuade a user into opening a specially crafted Wordperfect (WPD)
document. If successful, the attacker could execute arbitrary code with
the permissions of the victim.

Vendor Status:
The libwpd maintainers have addressed these vulnerabilities with the
release of version 0.8.9.

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2007-0002>
CAN-2007-0002

Disclosure Timeline:
* 01/11/2007 - Initial vendor notification
* 01/12/2007 - Initial vendor response
* 03/16/2007 - 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=490>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=490



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