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Category:   Application (Security)  >   F-Secure Anti-Virus Vendors:   F-Secure
(F-Secure Issues Fix) OpenSSL ASN.1 Bugs, SSL_get_shared_ciphers() Buffer Overflow, and SSLv2 Client Error Lets Remote Users Denial of Service or Execute Arbitrary Code
SecurityTracker Alert ID:  1017312
SecurityTracker URL:  http://securitytracker.com/id/1017312
CVE Reference:   CVE-2006-2937   (Links to External Site)
Date:  Nov 29 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.40, 6.60
Description:   Several vulnerabilities were reported in OpenSSL. A remote user can cause denial of service conditions. A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted, invalid ASN.1 structures to trigger an infinite loop [CVE-2006-2937]. As a result, the process will consume excessive system memory. Versions prior to 0.9.7 are not affected.

A remote user can use certain types of public keys to cause the target system to take a disproportionate amount of time to process [CVE-2006-2940].

Dr. S. N. Henson developed the ASN.1 test suite for NISCC that uncovered these denial of service vulnerabilities.

A user can send a specially crafted list of ciphers to an application that uses the SSL_get_shared_ciphers() function to trigger a buffer overflow and potentially execute arbitrary code [CVE-2006-3738]. The vendor credits Tavis Ormandy and Will Drewry of the Google Security Team with reporting this vulnerability.

A remote server can cause a connected SSLv2 client to crash [CVE-2006-4343]. The vendor credits Tavis Ormandy and Will Drewry of the Google Security Team with reporting this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system.

A remote user can cause denial of service conditions.

Solution:   F-Secure has issued a fixed version of F-Secure Anti-Virus for Microsoft Exchange (6.61), which is affected by the OpenSSL ASN.1 denial of service vulnerability CVE-2006-2937. Also, a patch for version 6.40 is available at:

ftp://ftp.f-secure.com/support/hotfix/fsav-mse/fsavmse640-06.zip

The F-Secure advisory is available at:

http://www.f-secure.com/security/fsc-2006-6.shtml

Cause:   State error
Underlying OS:  Windows (Any)

Message History:   This archive entry is a follow-up to the message listed below.
Sep 29 2006 OpenSSL ASN.1 Bugs, SSL_get_shared_ciphers() Buffer Overflow, and SSLv2 Client Error Lets Remote Users Denial of Service or Execute Arbitrary Code



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