(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
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SecurityTracker Alert ID: 1017010 |
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SecurityTracker URL: http://securitytracker.com/id/1017010
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CVE Reference:
CVE-2006-2937, CVE-2006-2940, CVE-2006-3738, CVE-2006-4343
(Links to External Site)
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Date: Oct 8 2006
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Impact:
Denial of service via network, Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 0.9.7l, 0.9.8d
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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.
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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:
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
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Vendor URL: www.openssl.org/news/secadv_20060928.txt (Links to External Site)
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Cause:
Boundary error, Exception handling error, State error
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Underlying OS:
UNIX (OpenBSD)
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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: Sat, 7 Oct 2006 20:31:52 -0400
Subject: OpenBSD vulnerabilities
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SECURITY FIX: October 7, 2006 All architectures
Several problems have been found in OpenSSL. While parsing certain invalid ASN.1
structures an error condition is mishandled, possibly resulting in an infinite loop. A
buffer overflow exists in the SSL_get_shared_ciphers function. A NULL pointer may be
dereferenced in the SSL version 2 client code. In addition, many applications using
OpenSSL do not perform any validation of the lengths of public keys being used.
CVE-2006-2937, CVE-2006-3738, CVE-2006-4343, CVE-2006-2940
A source code patch exists which remedies this problem.
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
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