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Vigil@nce - Apache httpd mod_nss: privilege escalation via Disabled Ciphers

March 2016 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can use an obsolete algorithm with Apache httpd
mod_nss, in order to perform a Man-in-the-Middle.

Impacted products: Apache httpd Modules not comprehensive,
Fedora.

Severity: 2/4.

Creation date: 11/01/2016.

DESCRIPTION OF THE VULNERABILITY

The mod_nss module can be installed on Apache httpd.

The NSSCipherSuite option indicates algorithms. For example :
NSSCipherSuite !eNULL:!aNULL:AESGCM+aRSA:ECDH+aRSA

However, the negation (!) operator is ignored.

An attacker can therefore use an obsolete algorithm with Apache
httpd mod_nss, in order to perform a Man-in-the-Middle.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Apache-httpd-mod-nss-privilege-escalation-via-Disabled-Ciphers-18673


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