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Category:   Application (VPN)  >   OpenSSL Vendors:
(IBM Issues Fix) OpenSSL CMS_verify() Error Handling Flaw Lets Users Bypass Security Checks
SecurityTracker Alert ID:  1022200
SecurityTracker URL:
CVE Reference:   CVE-2009-0591   (Links to External Site)
Date:  May 11 2009
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.9.8h - 0.9.8j
Description:   A vulnerability was reported in OpenSSL. A remote user can bypass certain security checks.

A remote user with access to a signer's private key can generate a specially crafted signature that is not valid but will be detected as valid. The vulnerability resides in the CMS_verify() function in the handling of an error condition with specially crafted signed attributes.

Only CMS users are affected.

Ivan Nestlerode reported this vulnerability.

Impact:   A remote user can create an invalid signature that will be determined to be a valid signature.
Solution:   IBM has issued a fix for AIX (OpenSSL AIX version, available at:

The IBM advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Authentication error, State error
Underlying OS:  UNIX (AIX)
Underlying OS Comments:  5.2, 5.3, 6.1

Message History:   This archive entry is a follow-up to the message listed below.
Mar 25 2009 OpenSSL CMS_verify() Error Handling Flaw Lets Users Bypass Security Checks

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