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Vigil@nce - Apache Subversion: wrong validation of SSL certificate

August 2014 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can use a certificate with wildcard to spoof a
Subversion server.

Impacted products: Subversion, openSUSE, Ubuntu

Severity: 2/4

Creation date: 12/08/2014

DESCRIPTION OF THE VULNERABILITY

In order to access to WebDAV servers, the Subversion client
library may use the library serf.

To check whether a wildcard DNS name from an SSL certificate
matches the targeted server name, the serf library use a C
function that is designed for filename matching. However, rules
for matching certificate names are stricter. So, the library
accepts some SSL certificates for a given targeted SVN server that
it should reject.

An attacker can therefore use a certificate with wildcard to spoof
a Subversion server.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Apache-Subversion-wrong-validation-of-SSL-certificate-15163


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