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WordPress: information disclosure via Advanced XML Reader
Synthesis of the vulnerability
An attacker can use an external XML entity in Advanced XML Reader of WordPress, in order to obtain sensitive information.
Impacted products: WordPress Plugins.
Creation date: 03/05/2013.
Identifiers: BID-59618, VIGILANCE-VUL-12750.
Description of the vulnerability
XML data can contain external entities (DTD):
<!ENTITY name SYSTEM "file">
<!ENTITY name SYSTEM "http://server/file">
A program which reads these XML data can replace these entities by data coming from the indicated file. When the program uses XML data coming from an untrusted source, this behavior leads to:
- content disclosure from files of the server
- private web site scan
- a denial of service by opening a blocking file
This feature thus must be disabled to process XML data coming from an untrusted source.
However, the Advanced XML Reader plugin allows external entities.
An attacker can therefore transmit malicious XML data to Advanced XML Reader, in order to force it to include a file, which can then be returned to the attacker.
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