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Category:   Application (Generic)  >   BIND Vendors:   ISC (Internet Software Consortium)
(ISC Issues Fix for BIND) 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:  1017158
SecurityTracker URL:  http://securitytracker.com/id/1017158
CVE Reference:   CVE-2006-2937, CVE-2006-2940   (Links to External Site)
Date:  Nov 4 2006
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 9.x
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. BIND is affected.

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:   BIND is affected by the CVE-2006-2937 and CVE-2006-2940 OpenSSL vulnerabilities (OpenSSL is required to use DNSSEC with BIND and had been included in earlier versions the BIND distribution).

The vendor has issued the following fixed versions: BIND 9.2.6-P2, BIND 9.3.2-P2, BIND 9.2.7rc3, BIND 9.3.3rc3, and BIND 9.4.0b3.

Upgrade and then generate new RSASHA1 and RSAMD5 keys for all old keys that were using the old default exponent and perform a key rollover to the new keys.

Cause:   Boundary error, Exception handling error, State error
Underlying OS:  Linux (Any), UNIX (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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