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Category:   Application (VPN)  >   OpenSSL Vendors:
(OpenBSD Issues Fix) OpenSSL Signature Validation Flaw Lets Remote Users Bypass Validation Checks
SecurityTracker Alert ID:  1021550
SecurityTracker URL:
CVE Reference:   CVE-2008-5077   (Links to External Site)
Date:  Jan 9 2009
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 0.9.8j
Description:   A vulnerability was reported in OpenSSL. A remote user can bypass digital signature validation.

The software does not properly check the results of the 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.

The Google Security Team reported this vulnerability.

Impact:   A remote user can bypass certificate validation.
Solution:   OpenBSD has issued source code patches.

The OpenBSD advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Authentication error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  4.3, 4.4

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

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