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CVE-2017-12627: Apache Xerces-C DTD vulnerability processing external paths

Severity: Medium

Vendor: The Apache Software Foundation

Versions Affected: Apache Xerces-C XML Parser library versions
prior to V3.2.1

Description: The Xerces-C XML parser mishandles certain kinds of external
DTD references, resulting in dereference of a NULL pointer while processing
the path to the DTD. The bug allows for a denial of service attack in
applications that allow DTD processing and do not prevent external DTD
usage, and could conceivably result in remote code execution.

Mitigation: Applications that are using library versions older than
V3.2.1 should upgrade as soon as possible. Distributors of older versions
should apply the patch from this subversion revision:

http://svn.apache.org/viewvc?view=revision&revision=1819998

Applications should strongly consider blocking remote entity resolution
and/or outright disabling of DTD processing in light of the continued
identification of bugs in this area of the library.

Credit: This issue was reported by Alberto Garcia, Francisco Oca,
and Suleman Ali of Offensive Research at Salesforce.com.

References:
http://xerces.apache.org/xerces-c/secadv/CVE-2017-12627.txt

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