59737 : Expat libexpat lib/xmltok_impl.c updatePosition Function UTF-8 XML Document Handling Overflow DoS
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
4	907	over 3 years ago	5 months ago	13 times	100%

Timeline

Disclosure Date
2009-01-17

Time to Patch	Time to Vendor Response
2 days	1 days

Description

Expat contains a flaw in the handling XML files that may allow a remote denial of service. The issue is due to the 'updatePosition()' function in lib/xmltok_impl.c. With a specially crafted XML file containing malformed UTF-8 sequences, a context-dependent attacker can cause the service to crash.

Classification

Location: Context Dependent
Attack Type: Denial of Service
Impact: Loss of Availability
Solution: Patch / RCS
Exploit: Exploit Public
Disclosure: Vendor Verified
OSVDB: Web Related

Solution

Currently, there are no known workarounds or upgrades to correct this issue. However, a patch has been committed to the source code repository (e.g. GIT, CVS, SVN) that addresses this vulnerability. Until it is incorporated into the next release of the software, manually patching an existing installation is the only known available solution. Check the vendor links in the references section for more information.

Products

Expat

2.0.1

References

Tools & Filters

	50070

Credit

Peter Valchev

CVSSv2 Score

CVSSv2 Base Score = 5.0
Source: nvd.nist.gov | Generated: 2009-11-04 | Disagree?

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