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Apache Tomcat Security Manager Persistence Bypass

Apache Tomcat Security Manager Persistence Bypass
Posted Feb 22, 2016
Authored by Mark Thomas | Site tomcat.apache.org

Apache Tomcat provides several session persistence mechanisms. The StandardManager persists session over a restart. The PersistentManager is able to persist sessions to files, a database or a custom Store. The Cluster implementation persists sessions to one or more additional nodes in the cluster. All of these mechanisms could be exploited to bypass a security manager. Session persistence is performed by Tomcat code with the permissions assigned to Tomcat internal code. By placing a carefully crafted object into a session, a malicious web application could trigger the execution of arbitrary code. Apache Tomcat versions 6.0.0 through 6.0.44, 7.0.0 through 7.0.67, 8.0.0.RC1 through 8.0.30, and 9.0.0.M1 are affected.

tags | advisory, web, arbitrary
advisories | CVE-2016-0714
MD5 | 0161201165f0e16b92a808ed998fb0e6

Apache Tomcat Security Manager Persistence Bypass

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Hash: SHA256

CVE-2016-0714 Apache Tomcat Security Manager Bypass

Severity: Moderate

Vendor: The Apache Software Foundation

Versions Affected:
- - Apache Tomcat 6.0.0 to 6.0.44
- - Apache Tomcat 7.0.0 to 7.0.67
- - Apache Tomcat 8.0.0.RC1 to 8.0.30
- - Apache Tomcat 9.0.0.M1
- - Earlier, unsupported Tomcat versions may be affected

Description:
Tomcat provides several session persistence mechanisms. The
StandardManager persists session over a restart. The PersistentManager
is able to persist sessions to files, a database or a custom Store. The
Cluster implementation persists sessions to one or more additional nodes
in the cluster. All of these mechanisms could be exploited to bypass a
security manager. Session persistence is performed by Tomcat code with
the permissions assigned to Tomcat internal code. By placing a carefully
crafted object into a session, a malicious web application could trigger
the execution of arbitrary code.

Mitigation:
Users of affected versions should apply one of the following mitigations
- - Upgrade to Apache Tomcat 9.0.0.M3 or later
(9.0.0.M2 has the fix but was not released)
- - Upgrade to Apache Tomcat 8.0.32 or later
(8.0.31 has the fix but was not released)
- - Upgrade to Apache Tomcat 7.0.68 or later
- - Upgrade to Apache Tomcat 6.0.45 or later


Credit:
This issue was discovered by The Apache Tomcat Security Team.

References:
[1] http://tomcat.apache.org/security-9.html
[2] http://tomcat.apache.org/security-8.html
[3] http://tomcat.apache.org/security-7.html
[4] http://tomcat.apache.org/security-6.html

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