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Category:   Application (Generic)  >   ICU Vendors:   icu-project.org
ICU Regular Expression Processing Bug May Let Users Execute Arbitrary Code
SecurityTracker Alert ID:  1019269
SecurityTracker URL:  http://securitytracker.com/id/1019269
CVE Reference:   CVE-2007-4770, CVE-2007-4771   (Links to External Site)
Date:  Jan 25 2008
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.8.1 and prior versions
Description:   Two vulnerabilities were reported in ICU. A user may be able to cause arbitrary code to be executed on the target system.

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:   The vendor has issued a source code fix, available via SVN.

The ICU advisory is available at:

http://sourceforge.net/mailarchive/message.php?msg_name=d03a2ffb0801221538x68825e42xb4a4aaf0fcccecbd%40mail.gmail.com

Vendor URL:  icu-project.org/ (Links to External Site)
Cause:   Boundary error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 25 2008 (Red Hat Issues Fix) ICU Regular Expression Processing Bug May Let Users Execute Arbitrary Code
Red Hat has released a fix for Red Hat Enterprise Linux 5.
Mar 11 2008 (Sun Issues Fix) ICU Regular Expression Processing Bug May Let Users Execute Arbitrary Code
Sun has issued a fix for Solaris 9 and 10.
Apr 18 2008 (OpenOffice Issues Fix) ICU Regular Expression Processing Bug May Let Users Execute Arbitrary Code
OpenOffice.org has issued a fix for OpenOffice



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