(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
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SecurityTracker Alert ID: 1017314 |
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SecurityTracker URL: http://securitytracker.com/id/1017314
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CVE Reference:
CVE-2006-2937
(Links to External Site)
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Date: Nov 29 2006
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 6.40, 6.41, 6.42, 6.50, 6.60
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Description:
Several vulnerabilities were reported in OpenSSL. A remote user can cause denial of service conditions. F-Secure Internet Gatekeeper 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.
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Impact:
A remote user can execute arbitrary code on the target system.
A remote user can cause denial of service conditions.
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Solution:
F-Secure has issued a fix for F-Secure Internet Gatekeeper, which is affected by the OpenSSL ASN.1 denial of service vulnerability CVE-2006-2937. A patch for version 6.60 is available at:
ftp://ftp.f-secure.com/support/hotfix/fsig/fsigk660-02.zip
The F-Secure advisory is available at:
http://www.f-secure.com/security/fsc-2006-6.shtml
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Cause:
State error
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Underlying OS:
Windows (2000), Windows (2003)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Wed, 29 Nov 2006 09:03:56 -0500
Subject: OpenSSL denial of service vulnerability in F-Secure Anti-Virus for Microsoft Exchange and F-Secure Internet Gatekeeper
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http://www.f-secure.com/security/fsc-2006-6.shtml
CVE-2006-2937
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