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Vigil@nce - Cisco Unified Communications Manager: bypassing authentication of Remote Mobile Access

November 2014 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can use an X.509 certificate with a SAN field on Cisco
Unified Communications Manager, in order to access to Remote
Mobile Access.

 Impacted products: Cisco CUCM
 Severity: 2/4
 Creation date: 12/11/2014

DESCRIPTION OF THE VULNERABILITY

The Cisco Unified Communications Manager product uses TLS
certificates to authenticate Remote Mobile Access Subsystem users.

However, an attacker can use a certificate, signed by a trusted
certification authority, but with a SAN (subjectAltName) field
indicating the wanted CN, in order to bypass the authentication.

An attacker can therefore use an X.509 certificate with a SAN
field on Cisco Unified Communications Manager, in order to access
to Remote Mobile Access.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Cisco-Unified-Communications-Manager-bypassing-authentication-of-Remote-Mobile-Access-15631


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