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Symfony2 Local File Disclosure - Security Advisory - SOS-12-002
Sense of Security - Security Advisory - SOS-12-002
Release Date. 05-Mar-2012
Last Update. -
Vendor Notification Date. 24-Feb-2012
Affected versions. 2.0.x - 2.0.10
Severity Rating. Medium
Impact. Exposure of sensitive information
Attack Vector. Remote without authentication
Solution Status. Vendor patch / Upgrade to 2.0.11
CVE reference. CVE - not yet assigned
The XMLEncoder component of Symfony 2.0.x fails to disable external
entities when parsing XML. In the Symfony2 framework the XML class
may be used to deserialize objects or as part of a client/server
API. By using external entities it is possible to include arbitrary
files from the file system. Any application written in Symfony2
that parses user supplied XML is affected.
Proof of Concept.
$serializer = new Serializer(array(), array(
'xml' => new \Symfony\Component\Serializer\Encoder\XmlEncoder()
$x = $serializer->decode('<?xml version="1.0"?><!DOCTYPE scan
[<!ENTITY test SYSTEM
// $x will now contain a copy of /etc/passwd base64 encoded.
Upgrade to Symfony 2.0.11 or apply the vendor provided patch.
Phil Taylor from Sense of Security Labs.
Sense of Security is a leading provider of information security and
risk management solutions. Our team has expert skills in assessment
and assurance, strategy and architecture, and deployment through to
ongoing management. We are Australia's premier application penetration
testing firm and trusted IT security advisor to many of the country's
Sense of Security Pty Ltd
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Sydney NSW 2000
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