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Bug 399247 (CVE-2012-0057) - <dev-lang/php-5.3.9 : xslt file writing vulnerability (CVE-2012-0057)
Summary: <dev-lang/php-5.3.9 : xslt file writing vulnerability (CVE-2012-0057)
Alias: CVE-2012-0057
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
Whiteboard: B3 [glsa]
Depends on:
Reported: 2012-01-18 04:03 UTC by Viorel Tabara
Modified: 2012-09-24 00:27 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---


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Description Viorel Tabara 2012-01-18 04:03:09 UTC
Nicolas Grégoire

Please find attached the "php539-xslt.php" script.

This script displays by default a pre-filled HTML form including some
XML data and XSLT code. When the form is submitted, the user-controlled
XML data is transformed using the user-controlled XSLT code. Then, the
output of this transformation is displayed in the browser.

When executed, the pre-filled XSLT code will write
to /var/www/xxx/backdoor.php this content :

<h1><font color="red">I'm a (very) malicious PHP file !!!</font></h1>
<?php phpinfo()?>

Note : the payload is encrypted with RC4. A static key ("simple_demo")
embedded in the XSLT code is used to decrypt it.


Reproducible: Always
Comment 1 Agostino Sarubbo gentoo-dev 2012-01-18 09:38:40 UTC
@security, is already fixed in 5.3.9, please choise if it can goes into existing glsa
Comment 2 Sean Amoss (RETIRED) gentoo-dev Security 2012-01-21 13:45:47 UTC
Added to existing GLSA.
Comment 3 GLSAMaker/CVETool Bot gentoo-dev 2012-02-21 04:11:20 UTC
CVE-2012-0057 (
  PHP before 5.3.9 has improper libxslt security settings, which allows remote
  attackers to create arbitrary files via a crafted XSLT stylesheet that uses
  the libxslt output extension.
Comment 4 GLSAMaker/CVETool Bot gentoo-dev 2012-09-24 00:27:32 UTC
This issue was resolved and addressed in
 GLSA 201209-03 at
by GLSA coordinator Sean Amoss (ackle).