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Apache Standard Taglibs 1.2.1 XXE / Remote Command Execution

Apache Standard Taglibs 1.2.1 XXE / Remote Command Execution
Posted Feb 27, 2015
Authored by David Jorm

Apache Standard Taglibs version 1.2.1 suffers from XXE and remote command execution vulnerabilities via the XSL extension in JSTL XML tags.

tags | advisory, remote, vulnerability, xxe
SHA-256 | 8c2ab7316e10682e5ec4ae90bd77f5d88181ffc401373f41d68ce5954d7390c9

Apache Standard Taglibs 1.2.1 XXE / Remote Command Execution

Change Mirror Download
CVE-2015-0254 XXE and RCE via XSL extension in JSTL XML tags

Severity: Important

Vendor:
The Apache Software Foundation

Versions Affected:
Standard Taglibs 1.2.1
The unsupported 1.0.x and 1.1.x versions may also be affected.

Description:
When an application uses <x:parse> or <x:transform> tags to process untrusted XML documents, a request may utilize external entity references to access resources on the host system or utilize XSLT extensions that may allow remote execution.

Mitigation:
Users should upgrade to Apache Standard Taglibs 1.2.3 or later.

This version uses JAXP’s FEATURE_SECURE_PROCESSING to restrict XML processing. Depending on the Java runtime version in use, additional configuration may be required:
Java8: External entity access is automatically disabled if a SecurityManager is active.
Java7: JAXP properties may need to be used to disable external access. See http://docs.oracle.com/javase/tutorial/jaxp/properties/properties.html
Java6 and earlier: A new system property org.apache.taglibs.standard.xml.accessExternalEntity may be used to specify the protocols that can be used to access external entities. This defaults to “all” if no SecurityManager is present and to “” (thereby disabling access) if a SecurityManager is detected.

Credit:
David Jorm of IIX
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