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Category:   Application (VPN)  >   GnuTLS Vendors:
GnuTLS Invalid Hash Algorithm Null Pointer Dereference Lets Remote Users Deny Service
SecurityTracker Alert ID:  1024020
SecurityTracker URL:
CVE Reference:   CVE-2006-7239   (Links to External Site)
Date:  May 25 2010
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.4.2
Description:   A vulnerability was reported in GnuTLS. A remote user can cause denial of service conditions.

A remote user can send a specially crafted X.509 certificate that uses a hash algorithm not supported by GnuTLS to trigger a null pointer dereference and cause the target application to crash.

The vulonerability resides in the _gnutls_x509_oid2mac_algorithm() function in 'lib/gnutls_algorithms.c'.

satyakumar reported this vulnerability.

[Editor's note: This vulnerability was originally reported in 2006 but a CVE number was just assigned in May 2010.]

Impact:   A remote user can cause the target application to crash.
Solution:   The vendor has issued a fix (1.4.2).

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  Linux (Any)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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