To: bugtraqat_private announceat_private scoannmodat_private ______________________________________________________________________________ Caldera International, Inc. Security Advisory Subject: UnixWare 7.1.1 Open UNIX 8.0.0 : Apache Web Server Chunk Handling Vulnerability / mod_ssl off-by-one error Advisory number: CSSA-2002-SCO.31 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 ---------------------------------------------------------------------- UnixWare 7.1.1 Apache Open UNIX 8.0.0 Apache 3. Solution The proper solution is to install the latest packages. 4. UnixWare 7.1.1 4.1 Location of Fixed Binaries ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.31 4.2 Verification MD5 (apache-1.3.26.pkg.Z) = 75391ed80d727d9cd00a73c2cc24816b 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: Download apache-1.3.26.pkg.Z to the /var/spool/pkg directory # uncompress /var/spool/pkg/apache-1.3.26.pkg.Z # pkgadd -d /var/spool/pkg/apache-1.3.26.pkg 5. Open UNIX 8.0.0 5.1 Location of Fixed Binaries ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.31 5.2 Verification MD5 (apache-1.3.26.pkg.Z) = 75391ed80d727d9cd00a73c2cc24816b 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: Download apache-1.3.26.pkg.Z to the /var/spool/pkg directory # uncompress /var/spool/pkg/apache-1.3.26.pkg.Z # pkgadd -d /var/spool/pkg/apache-1.3.26.pkg 6. References Specific references for this advisory: http://www.cert.org/advisories/CA-2002-17.html http://httpd.apache.org/info/security_bulletin_20020617.txt http://www.modssl.org/ Caldera security resources: http://www.caldera.com/support/security/index.html This security fix closes Caldera incidents sr865893, fz521273, erg712079. 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 (jat_private) ______________________________________________________________________________
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