(Novell Issues Fix for eDirectory) OpenSSL ASN.1 Parsing Flaws Lets Remote User Crash Applications or Execute Arbitrary Code
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SecurityTracker Alert ID: 1010324 |
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SecurityTracker URL: http://securitytracker.com/id/1010324
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CVE Reference:
CAN-2003-0543, CAN-2003-0544
(Links to External Site)
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Date: May 28 2004
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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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Description:
Several vulnerabilities were reported in the ASN.1 parsing code in OpenSSL. A remote user may be able to cause arbitrary code to be executed on a server application that uses OpenSSL. Novell eDirectory is available.
It is reported that a remote user can send a specially crafted SSL client certificate containing invalid ASN.1 tag values to trigger a flaw in OpenSSL and cause OpenSSL to crash due to "out of bounds reads" (CVE: CAN-2003-0543 and CAN-2003-0544). These flaws affected 0.9.6 and 0.9.7. The specific impact depends on the application using OpenSSL. The report indicates that the effects against Apache (when using OpenSSL) are "limited" and only cause Apache httpd child processes to crash.
It is also reported that certain ASN.1 encodings detected to be invalid may trigger a double free of the ASN1_TYPE variable, deallocating memory that has already been deallocated (CVE: CAN-2003-0545). This flaw only affects 0.9.7. A remote user may be able to send a specially crafted SSL client certificate to an application that uses OpenSSL to potentially execute arbitrary code. The exact impact depends on how the application uses OpenSSL.
It is also reported that a remote user can specify an invalid public key in a certificate to cause the verify code to crash if the target server is configured to ignore public key decoding errors. The vendor notes that ignoring public key decoding errors is usually only done in debugging situations and not usually in production code. [Editor's note: A CVE number had not yet been assigned to this issue at the time of this entry.]
NISCC is credited with discovering these vulnerabilities.
The vendor reports a fourth related security issue, where an error in the SSL/TLS protocol handling will cause a server to parse a client certificate even when a client certificate is not specifically requested. As a result, any server application that uses OpenSSL can be attacked using the vulnerabilities described above, even if the server application does not enable client authentication.
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Impact:
A remote user can cause an OpenSSL-based server process to crash.
A remote user can cause arbitrary code to be executed by an OpenSSL-based server process.
In both cases, the specific impact depends on how OpenSSL is used by the server process.
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Solution:
Novell has issued Security Update 4, available at:
http://support.novell.com/servlet/filedownload/sec/pub/secupd4.tgz
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Vendor URL: support.novell.com/cgi-bin/search/searchtid.cgi?/2968981.htm (Links to External Site)
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Cause:
Boundary error, Input validation error, State error
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Underlying OS:
Linux (Any), UNIX (Any), Windows (Any)
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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: Thu, 27 May 2004 23:17:33 -0400
Subject: http://support.novell.com/cgi-bin/search/searchtid.cgi?/2968981.htm
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http://support.novell.com/cgi-bin/search/searchtid.cgi?/2968981.htm
Security Update 4 - TID2968981 (last modified 27MAY2004)
http://support.novell.com/servlet/filedownload/sec/pub/secupd4.tgz
> eDirectory running on Netware, Microsoft Windows, Linux, or Unix
> Novell has reviewed our application portfolio to identify products affected by the
> vulnerabilities reported by the NISCC. We have made the necessary changes to our
> products that use OpenSSL code. This patch resolves all known OpenSSL vulnerabilities
> that affected Novell security products.
> See http://www.cert.org (OpenSSL security vulnerabilities described in CERTŪ Advisories
> CAN-2003-0543 (VU#255484), CAN-2003-0544 (VU#380864, VU#686224, and VU#732952), and
> CAN=2004-0079 (VU#288574)) for more information on these vulnerabilities.
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