From security@sco.com Wed Jan 4 12:27:02 2006 From: security@sco.com To: security-announce@list.sco.com Date: Wed, 4 Jan 2006 12:23:05 -0500 (EST) Subject: [Full-disclosure] SCOSA-2006.4 OpenServer 5.0.6 OpenServer 5.0.7 : TCP Remote ICMP Denial Of Service Vulnerabilities -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ____________________________________________________________________________ __ SCO Security Advisory Subject: OpenServer 5.0.6 OpenServer 5.0.7 : TCP Remote ICMP Denial Of Service Vulnerabilities Advisory number: SCOSA-2006.4 Issue date: 2006 January 04 Cross reference: sr892503 fz530662 erg712759 CVE-2004-0790 CVE-2004-0791 CVE-2004-1060 ____________________________________________________________________________ __ 1. Problem Description The Internet Control Message Protocol is used to alert hosts on a network about certain situations, and the hosts then take automatic action to prevent network failures or to improve transport efficiency. The RFC recommends no security checking for in-bound ICMP messages, so long as a related connection exists, and may potentially allow several different Denials of Service. The following individual attacks are reported: A blind connection-reset attack is reported, which takes advantage of the specification that describes that on receiving a 'hard' ICMP error, the corresponding connection should be aborted. A remote attacker may terminate target TCP connections and deny service for legitimate users. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0790 to this issue. An ICMP Source Quench attack is reported, which exploits the specification that a host must react to ICMP Source Quench messages by slowing transmission on the associated connection. A remote attacker may effectively degrade performance for a legitimate connection. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-0791 to this issue. A suitable forged ICMP PMTUD message may be used to reduce the MTU for a given connection in a similar manner. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2004-1060 to this issue. 2. Vulnerable Supported Versions System Binaries -------------------------------------------------------------------- -- OpenServer 5.0.6 ip and tcp drivers OpenServer 5.0.7 ip and tcp drivers 3. Solution The proper solution is to install the latest packages. 4. OpenServer 5.0.6 4.1 Location of Fixed Binaries ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.4 4.2 Verification MD5 (VOL.000.000) = 03ed8e901780e1535c113efeba72d8cd md5 is available for download from ftp://ftp.sco.com/pub/security/tools 4.3 Installing Fixed Binaries The following packages should be installed on your system before you install this fix: RS506A OSS646 ERG711746: ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.3/SCOSA-2005.3.txt ERG712606: ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.9/SCOSA-2005.9.txt Upgrade the affected binaries with the following sequence: 1) Download the VOL* files to a directory. 2) Run the custom command, specify an install from media images, and specify the directory as the location of the images. 5. OpenServer 5.0.7 5.1 Location of Fixed Binaries ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.4 5.2 Verification MD5 (VOL.000.000) = 03ed8e901780e1535c113efeba72d8cd md5 is available for download from ftp://ftp.sco.com/pub/security/tools 5.3 Installing Fixed Binaries The following package should be installed on your system before you install this fix: OSR507MP4 - OpenServer 5, Release 5.0.7 Maintenance Pack 4 Upgrade the affected binaries with the following sequence: 1) Download the VOL* files to a directory. 2) Run the custom command, specify an install from media images, and specify the directory as the location of the images. 6. References Specific references for this advisory: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0790 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0791 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1060 SCO security resources: http://www.sco.com/support/security/index.html SCO security advisories via email http://www.sco.com/support/forums/security.html This security fix closes SCO incidents sr892503 fz530662 erg712759. 7. Disclaimer SCO 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 SCO products. 8. Acknowledgments The SCO Group would like to thank Fernando Gont for reporting these issues. ____________________________________________________________________________ __ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (UnixWare) iD8DBQFDvABwaqoBO7ipriERAiOAAJ9CiZ8KDSJq61MlGeAHvZJOod8PzQCcDwq0 FGjQW8oNTpcQAiDgd40s/NI= =ecCh -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/