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Category:   Application (Generic)  >   Apache OpenOffice Vendors:   OpenOffice.org
(OpenOffice Issues Fix) ICU Regular Expression Processing Bug May Let Users Execute Arbitrary Code
SecurityTracker Alert ID:  1019903
SecurityTracker URL:  http://securitytracker.com/id/1019903
CVE Reference:   CVE-2007-4770, CVE-2007-4771   (Links to External Site)
Date:  Apr 18 2008
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Two vulnerabilities were reported in ICU. A user may be able to cause arbitrary code to be executed on the target system. OpenOffice is affected.

A user can create a specially crafted regular expression that, when processed by an application that uses ICU, will trigger a memory corruption error and potentially execute arbitrary code on the target system. The code will run with the privileges of the target application.

If an application allows a remote user to submit arbitrary regular expressions, then a remote user may be able to exploit this flaw.

A regular expression pattern that contains a back reference to capture group zero (\0), which does not exist, may establish references to random memory addresses [CVE-2007-4770].

The doInterval() function in 'regexcmp.cpp' does not properly limit the size of the backtracking stack, allowing a heap overflow to be triggered [CVE-2007-4771].

Will Drewry reported these vulnerabilities.

Impact:   A user can create a regular expression that, when processed by the target application, may execute arbitrary code on the target system.
Solution:   OpenOffice.org has issued a fix for OpenOffice, which is affected by this vulnerability.

The OpenOffice advisory is available at:

http://www.openoffice.org/security/cves/CVE-2007-4770.html

Cause:   Boundary error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry is a follow-up to the message listed below.
Jan 25 2008 ICU Regular Expression Processing Bug May Let Users Execute Arbitrary Code



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