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Category:   Application (Security)  >   Citrix Secure Gateway Vendors:   Citrix
(Citrix Issues Fix for Secure Gateway) OpenSSL SSL/TLS Handshade Flaws May Let Remote Users Crash OpenSSL-based Applications
SecurityTracker Alert ID:  1010891
SecurityTracker URL:  http://securitytracker.com/id/1010891
CVE Reference:   CVE-2004-0079   (Links to External Site)
Date:  Aug 7 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.14
Description:   Some vulnerabilities were reported in OpenSSL, primarily involving the processing of SSL/TLS protocol handshakes. A remote user can cause OpenSSL to crash. Citrix Secure Gateway is affected.

It is reported that there is a null-pointer assignment in the do_change_cipher_spec() function [CVE: CVE-2004-0079]. A remote user can perform a specially crafted SSL/TLS handshake with a target server to cause OpenSSL to crash on the target system. This may cause the application using OpenSSL to crash.

All versions of OpenSSL from 0.9.6c to 0.9.6k inclusive and from 0.9.7a to 0.9.7c inclusive are reportedly vulnerable to this null-pointer bug.

It is also reported that there is a flaw in performing SSL/TLS handshakes using Kerberos ciphersuites [CVE: CVE-2004-0112]. A remote user can perform a specially crafted SSL/TLS handshake against a server that is using Kerberos ciphersuites to cause OpenSSL to crash on the target system.

OpenSSL versions 0.9.7a, 0.9.7b, and 0.9.7c are reported to be vulnerable to this Kerberos handshake bug.

It is also reported that a remote user may be able to cause OpenSSL to enter an infinite loop due to a flaw in a patch introduced in 0.9.6d [CVE: CVE-2004-0081].

The vendor credits Dr. Stephen Henson of the OpenSSL core team as well as Codenomicon for supplying their TLS Test Tool and Joe Orton of Red Hat for performing the majority of the testing.

Impact:   A remote user can cause OpenSSL to crash, which may cause an application using OpenSSL to crash. The specific impact depends on the application that uses the OpenSSL library.
Solution:   Citrix has issued a fixed version (1.14) of Citrix Secure Gateway, which is affected by the OpenSSL vulnerability. The fix is available at:

https://secureportal.citrix.com/MyCitrix/Portal/login.aspx

Vendor URL:  support.citrix.com/kb/entry.jspa?externalID=CTX104696 (Links to External Site)
Cause:   Boundary error, Exception handling error, State error
Underlying OS:  UNIX (Solaris - SunOS)

Message History:   This archive entry is a follow-up to the message listed below.
Mar 17 2004 OpenSSL SSL/TLS Handshade Flaws May Let Remote Users Crash OpenSSL-based Applications



 Source Message Contents

Subject:  http://support.citrix.com/kb/entry.jspa?externalID=CTX104696


http://support.citrix.com/kb/entry.jspa?externalID=CTX104696

 > CTX104696 - A specially crafted SSL/TLS handshake can be used to crash
 > the Secure Gateway Service

 > Document ID: CTX104696, Created on: Aug 5, 2004, Updated: Aug 6, 2004

 > Products: Secure Gateway for Solaris 1.12, Secure Gateway for Solaris 1.13

 > Severity: Medium

A denial of service vulnerability was reported in Secure Gateway for Solaris in versions 
prior to 1.14.  A remote user can send a specially crafted SSL/TLS handshake to cause the 
Secure Gateway Service to crash.  This is due to an underlying flaw in OpenSSL [CVE: 
CAN-2004-0079].

A fixed version (1.14) of Secure Gateway for Solaris is available at:

https://secureportal.citrix.com/MyCitrix/Portal/login.aspx



 
 


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