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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/R...




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