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Category:   Application (Generic)  >   Apache Xerces Vendors:   Apache Software Foundation
Xerces-C++ XML Attribute Processing Error Lets Remote Users Deny Service
SecurityTracker Alert ID:  1011507
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Oct 2 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.5.0
Description:   A denial of service vulnerability was reported in Xerces-C++. A remote user can cause excessive CPU consumption on the target system.

Amit Klein reported that a remote user can create a specially crafted XML document that, when parsed by the target user with Xerces-C++, will cause the target application to consume all available CPU resources on the target system. The duration may range from seconds to a few minutes, depending on the size of the XML document.

Specially crafted XML attributes will trigger the flaw.

Impact:   A remote user can cause excessive CPU consumption on the target system for a temporary period of time.
Solution:   The vendor has released a fixed version (2.6.0), available at:

Vendor URL: (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  Security advisory - Xerces-C++ 2.5.0: Attribute blowup

*** Security Advisory

*** Xerces-C++ 2.5.0: Attribute blowup denial-of-service

*** Author: Amit Klein

*** Release Date: October 2nd, 2004

*** Description:
An attacker can craft a malicious XML document, which uses XML 
attributes in a way that inflicts a denial of service condition 
on the target machine (XML parser).
The result of this attack is that the XML parser consumes all the CPU 

resources for a long period of time (from seconds to minutes, 
depending on the size of the payload).
In our experiments, we were able to send attacks (of few hunderd KBs) 

that caused the target machines to consume 100% CPU for several 

*** Vendor status
Vendor was contacted, and a fix was included for the newly released 
version of Xerces-C++ (2.6.0).

*** Solution:
Upgrade to Xerces-C++ 2.6.0


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