full-disclosure - [CVE-2012-3446] Apache Libcloud - possible SSL MITM due to invalid regular expression used to validate the target server hostname

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Date: Wed, 1 Aug 2012 23:53:32 -0700
From: Tomaž Muraus <tomaz@...che.org>
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: [CVE-2012-3446] Apache Libcloud - possible SSL
 MITM due to invalid regular expression used to validate the target server
 hostname

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Hash: SHA1

CVE-2012-3446: Apache Libcloud - possible MITM due to invalid regular
expression used to validate the target server hostname

Severity: Medium

Vendor:

The Apache Software Foundation

Versions Affected:

Apache Libcloud 0.4.2 to 0.11.1

Versions prior to 0.4.2 don't perform any target server SSL certificate
validation.

Description:

When establishing a secure (SSL / TLS) connection to a target server an
invalid regular expression has been used for performing the hostname
verification. Subset instead of the full target server hostname has been
marked an an acceptable match for the given hostname.

For example, certificate with a hostname field of "aexample.com" was
considered
a valid certificate for domain "example.com".

Mitigation:

Users should upgrade to the latest version (0.11.1) which includes a fix.

Credit:

This issue was discovered by researchers from the University of Texas at
Austin
(Martin Georgiev, Suman Jana and Vitaly Shmatikov).

References:

http://libcloud.apache.org/security.html
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