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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
OpenSSL ECDH Ciphersuite and CRL Update Bugs Lets Remote Users Deny Service and Bypass CRL Updates
SecurityTracker Alert ID:  1026012
SecurityTracker URL:  http://securitytracker.com/id/1026012
CVE Reference:   CVE-2011-3207, CVE-2011-3210   (Links to External Site)
Date:  Sep 6 2011
Impact:   Denial of service via network, Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.9.8 through 0.9.8s, 1.0.0 through 1.0.0d
Description:   Two vulnerabilities were reported in OpenSSL. A remote user can cause denial of service conditions. A remote user may be able to bypass CRL updates.

The internal certificate verification routines may incorrectly accept a certificate revocation list (CRL) with a nextUpdate field value that is in the past [CVE-2011-3207]. Applications that enable the internal CRL checking [not the default setting] are affected. Only versions 1.0.0 through 1.0.0d are affected.

Kaspar Brand reported this vulnerability.

A remote user can send a specially crafted, out of order handshake message to exploit a flaw in the ephemeral ECDH ciphersuite code and cause the service to crash [CVE-2011-3210].

Adam Langley reported this vulnerability.

Impact:   A remote user can cause the target service to crash.

A remote user may be able to bypass CRL updates.

Solution:   The vendor has issued a fix (1.0.0e).

The vendor's advisory is available at:

http://openssl.org/news/secadv_20110906.txt

Vendor URL:  openssl.org/news/secadv_20110906.txt (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 26 2011 (Red Hat Issues Fix) OpenSSL ECDH Ciphersuite and CRL Update Bugs Lets Remote Users Deny Service and Bypass CRL Updates
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Jan 25 2012 (HP Issues Fix for HP-UX) OpenSSL ECDH Ciphersuite and CRL Update Bugs Lets Remote Users Deny Service and Bypass CRL Updates
HP has issued a fix for HP-UX 11.11, 11.23, and 11.31.



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