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vulnerability announce CVE-2013-4286

Apache Tomcat: data injection via Content-Length

Synthesis of the vulnerability

An attacker can use two Content-Length headers in order to alter behaviour of HTTP data analysis.
Impacted products: Tomcat, Debian, Solaris, RHEL, JBoss Enterprise, Ubuntu.
Severity: 1/4.
Creation date: 25/02/2014.
Identifiers: BID-65773, CERTFR-2014-AVI-244, CVE-2013-4286, DSA-2897-1, RHSA-2014:0343-01, RHSA-2014:0344-01, RHSA-2014:0345-01, RHSA-2014:0373-01, RHSA-2014:0374-01, RHSA-2014:0429-01, RHSA-2014:0458-01, RHSA-2014:0459-01, RHSA-2014:0511-01, RHSA-2014:0525-01, RHSA-2014:0526-01, RHSA-2014:0527-01, RHSA-2014:0528-01, RHSA-2014:0686-01, USN-2130-1, VIGILANCE-VUL-14307.

Description of the vulnerability

The Content-Length header indicates size of HTTP data.

When two or several Content-Length headers are present, each entity (client, proxy, server) can take a different decision:
 - use first value
 - use last value
 - etc.
These different behaviors for example permit to inject data to corrupt a cache or obtain sensitive information (VIGILANCE-VUL-4047, VIGILANCE-VUL-6675).

The HTTP and AJP connectors of Tomcat server do not ignore these multiple headers, and are thus impacted by this attack family.
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