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Category:   Application (Security)  >   OpenSSL Vendors:   OpenSSL.org
(OpenBSD 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:  1017010
SecurityTracker URL:  http://securitytracker.com/id/1017010
CVE Reference:   CVE-2006-2937, CVE-2006-2940, CVE-2006-3738, CVE-2006-4343   (Links to External Site)
Date:  Oct 8 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): prior to 0.9.7l, 0.9.8d
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:   OpenBSD has issued a fix.

ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.8/common/018_openssl2.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/013_openssl2.patch

Vendor URL:  www.openssl.org/news/secadv_20060928.txt (Links to External Site)
Cause:   Boundary error, Exception handling error, State error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  3.8, 3.9

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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