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Category:   Application (VPN)  >   GnuTLS Vendors:   gnutls.org
(Ubuntu Issues Fix for GnuTLS) Mozilla Firefox MD5 Signature Support in TLS ServerKeyExchange Messages Exposes Users to Hash Collision Forgery Attacks
SecurityTracker Alert ID:  1034623
SecurityTracker URL:  http://securitytracker.com/id/1034623
CVE Reference:   CVE-2015-7575   (Links to External Site)
Date:  Jan 8 2016
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Mozilla Firefox. A remote user can conduct hash collision forgery attacks. GnuTLS is affected.

The system allows the use of MD5 server signatures in a TLS 1.2 ServerKeyExchange message. As a result, the system may be subject to hash collision forgery attacks.

Karthikeyan Bhargavan reported this vulnerability.

Impact:   A remote user can conduct hash collision forgery attacks.
Solution:   Ubuntu has issued a fix for GnuTLS.

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-2865-1

Vendor URL:  www.ubuntu.com/usn/usn-2865-1 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 LTS, 14.04 LTS, 15.04

Message History:   This archive entry is a follow-up to the message listed below.
Dec 28 2015 Mozilla Firefox MD5 Signature Support in TLS ServerKeyExchange Messages Exposes Users to Hash Collision Forgery Attacks



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