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Vigil@nce - Raptor: file reading via RDF with an XML external entity

April 2012 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can invite the victim to open a malicious RDF file
with an application linked to Raptor, in order to obtain a copy of
victim’s files.

Severity: 2/4

Creation date: 23/03/2012

IMPACTED PRODUCTS

 Debian Linux
 Red Hat Enterprise Linux
 SUSE Linux Enterprise Desktop
 SUSE Linux Enterprise Server
 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The RDF (Resource Description Framework) format is used to
represent data. It is based on XML.

XML data can contain external entities (DTD):



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 data coming from an
untrusted source.

The Raptor library implements RDF. However, Raptor does not
disable this feature for RDF files.

An attacker can therefore invite the victim to open a malicious
RDF file with an application linked to Raptor, in order to obtain
a copy of victim’s files.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Raptor-file-reading-via-RDF-with-an-XML-external-entity-11484


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