Date: Mon, 1 Jul 2002 15:17:29 -0700
From: [email protected]
To: [email protected], [email protected],
Subject: Security Update: [CSSA-2002-SCO.32] OpenServer 5.0.5 OpenServer 5.0.6 : Apache Web Server Chunk Handling Vulnerability / mod_ssl off-by-one error
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To: [email protected][email protected][email protected]
______________________________________________________________________________
Caldera International, Inc. Security Advisory
Subject: OpenServer 5.0.5 OpenServer 5.0.6 : Apache Web Server Chunk Handling Vulnerability / mod_ssl off-by-one error
Advisory number: CSSA-2002-SCO.32
Issue date: 2002 July 01
Cross reference:
______________________________________________________________________________
1. Problem Description
This advisory addresses two separate vulnerabilities:
1) There is a remotely exploitable vulnerability in the
handling of large chunks of data in web servers that are
based on Apache source code.
2) mod_ssl registers a rewrite_command hook when backward
compatibility is enabled. The ssl_compat_directive() is
called for every line read in a configuration file, and
contains an off-by-one error while doing so.
2. Vulnerable Supported Versions
System Subsystem
----------------------------------------------------------------------
OpenServer 5.0.5 Apache
OpenServer 5.0.6 Apache
3. Solution
The proper solution is to install the latest packages.
4. OpenServer 5.0.5
4.1 Location of Fixed Binaries
ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.32
4.2 Verification
MD5 (VOL.000.000) = 87ccdaa522968532ca4c64b7e22ed7d2
md5 is available for download from
ftp://ftp.caldera.com/pub/security/tools
4.3 Installing Fixed Binaries
Upgrade the affected binaries with the following commands:
1) Download the VOL* files to the /tmp directory
Run the custom command, specify an install from media images,
and specify the /tmp directory as the location of the images.
5. OpenServer 5.0.6
5.1 Location of Fixed Binaries
ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.32
5.2 Verification
MD5 (VOL.000.000) = 87ccdaa522968532ca4c64b7e22ed7d2
md5 is available for download from
ftp://ftp.caldera.com/pub/security/tools
5.3 Installing Fixed Binaries
Upgrade the affected binaries with the following commands:
1) Download the VOL* files to the /tmp directory
Run the custom command, specify an install from media images,
and specify the /tmp directory as the location of the images.
6. References
Specific references for this advisory:
http://www.cert.org/advisories/CA-2002-17.htmlhttp://httpd.apache.org/info/security_bulletin_20020617.txthttp://www.modssl.org/
Caldera security resources:
http://www.caldera.com/support/security/index.html
This security fix closes Caldera incidents sr865897, fz521278,
erg712081.
7. Disclaimer
Caldera International, Inc. is not responsible for the
misuse of any of the information we provide on this website
and/or through our security advisories. Our advisories are
a service to our customers intended to promote secure
installation and use of Caldera products.
8. Acknowledgements
Neel Mehta of the ISS X-Force discovered the Apache
vulnerability. Mark Litchfield reported the vulnerability
to the Apache Software Foundation, and Mark Cox reported
it to the CERT/CC.
The mod_ssl vulnerability information was obtained from an
advisory by Frank Denis ([email protected])
______________________________________________________________________________
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