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Apache Tomcat Information Disclosure

Apache Tomcat Information Disclosure
Posted Feb 25, 2014
Authored by Mark Thomas | Site tomcat.apache.org

Apache Tomcat versions 8.0.0-RC1, 7.0.0 through 7.0.42, and 6.0.0 through 6.0.37 suffer from an information disclosure vulnerability due to an incomplete fix for CVE-2005-2090.

tags | advisory, info disclosure
advisories | CVE-2005-2090, CVE-2013-4286
SHA-256 | 85aca72a0ab50801bdc11f8b35cd76f7c8566b582f96d36c721332941fd2bdcc

Apache Tomcat Information Disclosure

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Hash: SHA1

CVE-2013-4286 Incomplete fix for CVE-2005-2090 (Information disclosure)

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
- - Apache Tomcat 8.0.0-RC1
- - Apache Tomcat 7.0.0 to 7.0.42
- - Apache Tomcat 6.0.0 to 6.0.37

Description:
The fix for CVE-2005-2090 was not complete. It did not cover the
following cases:
- - content-length header with chunked encoding over any HTTP connector
- - multiple content-length headers over any AJP connector

Requests with multiple content-length headers or with a content-length
header when chunked encoding is being used should be rejected as
invalid. When multiple components (firewalls, caches, proxies and
Tomcat) process a sequence of requests where one or more requests
contain either multiple content-length headers or a content-length
header when chunked encoding is being used and several components do not
reject the request and make different decisions as to which
content-length header to use an attacker can poison a web-cache, perform
an XSS attack and obtain sensitive information from requests other then
their own. Tomcat now rejects requests with multiple content-length
headers or with a content-length header when chunked encoding is being
used.

Mitigation:
Users of affected versions should apply one of the following mitigations
- - Upgrade to Apache Tomcat 8.0.0-RC3 or later
(8.0.0-RC2 contains the fix but was not released)
- - Upgrade to Apache Tomcat 7.0.47 or later
(7.0.43 to 7.0.46 contain the fix but were not released)
- - Upgrade to Apache Tomcat 6.0.39 or later
(6.0.38 contains the fix but was not released)

Credit:
This issue was identified by the Apache Tomcat security team while
investigating an invalid report related to CVE-2005-2090.

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