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Category:   Application (VPN)  >   OpenSSL Vendors:
OpenSSL EVP_PKEY_verify_recover() May Cause Improper Key Validation
SecurityTracker Alert ID:  1024052
SecurityTracker URL:
CVE Reference:   CVE-2010-1633   (Links to External Site)
Date:  Jun 2 2010
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0.0 only
Description:   A vulnerability was reported in OpenSSL. A remote or local user may be able to bypass key validation in certain cases.

The EVP_PKEY_verify_recover() function may fail to return the proper error code when verification recovery fails for RSA keys. Applications that use the vulnerable function may incorrectly validate an invalid key.

The OpenSSL utility application 'pkeyutl' uses the vulnerable function and is affected.

Peter-Michael Hager reported this vulnerability.

Impact:   A user may be able to bypass key validation.
Solution:   The vendor has issued a fix (1.0.0a).

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:   Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

Date:  Wed, 02 Jun 2010 14:19:03 +0000
Subject:  OpenSSL

OpenSSL Security Advisory [01-Jun-2010]

Two security flaws have been fixed in OpenSSL 0.9.8o and OpenSSL 1.0.0a.

Invalid ASN1 module definition for CMS.

CMS structures containing OriginatorInfo are mishandled this can write to
invalid memory addresses or free up memory twice

This bug is only present in the CMS code: the older PKCS#7 code is not affected.

CMS is only present in OpenSSL 0.9.8h and later where it is disabled by
default and 1.0.0 where it is enabled by default.

Users of OpenSSL CMS code should update to 0.9.8o or 1.0.0a which contains a
patch to correct this issue.

Thanks to Ronald Moesbergen for reporting this issue.

Invalid Return value check in pkey_rsa_verifyrecover

When verification recovery fails for RSA keys an uninitialised buffer with an
undefined length is returned instead of an error code (CVE-2010-1633).

This bug is only present in OpenSSL 1.0.0 and only affects applications that
call the function EVP_PKEY_verify_recover(). As this function is not present
in previous versions of OpenSSL and not used by OpenSSL internal code very few
applications should be affected. The OpenSSL utility application "pkeyutl" does 
use this function.

Affected users should update to 1.0.0a which contains a patch to correct this

Thanks to Peter-Michael Hager for reporting this issue.


URL for this Security Advisory:


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