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Category:   Device (Embedded Server/Appliance)  >   McAfee Email and Web Security Appliance Vendors:   McAfee
(McAfee Issues Fix for McAfee Email and Web Security Appliance) NTP Signature Validation Flaw Lets Remote Users Bypass Validation Checks
SecurityTracker Alert ID:  1027723
SecurityTracker URL:  http://securitytracker.com/id/1027723
CVE Reference:   CVE-2009-0021   (Links to External Site)
Date:  Nov 5 2012
Impact:   Disclosure of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.6
Description:   A vulnerability was reported in NTP. A remote user can bypass digital signature validation. McAfee Email and Web Security Appliance is affected.

The software does not properly check the results of the OpenSSL EVP_VerifyFinal() function. As a result, a remote server can supply a specially crafted invalid signature on a certificate that will be detected as a valid certificate. Signature checks on DSA and ECDSA keys used with SSL/TLS are affected.

Clients that connect to servers using RSA keys are not affected.

Client certificate validation is not affected.

Impact:   A remote user can bypass certificate validation.
Solution:   McAfee has issued a fix for McAfee Email and Web Security Appliance (5.6 Patch 5; pending).

The McAfee advisory is available at:

https://kc.mcafee.com/corporate/index?page=content&id=KB76646

Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Jan 7 2009 NTP Signature Validation Flaw Lets Remote Users Bypass Validation Checks



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