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Xerces (named after the Xerces Blue butterfly) provides world-class XML parsing and generation. Fully-validating parsers are available for both Java and C++, implementing the W3C XML and DOM (Level 1 and 2) standards, as well as the de facto SAX (version 2) standard. The parsers are highly modular and configurable. Initial support for XML Schema (draft W3C standard) is also provided.
A parsing problem has been found in the Xerces C++ library when handling a specially crafted XML document. The bug will cause the parses to consume all available CPU resources and effectively cause a denial of service. |
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Credit:
The information has been provided by Amit Klein (AKsecurity).
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Vulnerable Systems:
* Xerces-C++ library version 2.5.0
Immune Systems:
* Xerces-C++ library version 2.6.0
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. 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 order to obtain a DoS for several minutes payloads should be about a few hundred KBs in magnitude.
Vendor Status:
The developers at the Apache XML project have been contacted and a new version containing a fix is available. Upgrade to version 2.6.0.
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