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Message-ID: <20050228160703.A6628@caldera.com> Date: Mon, 28 Feb 2005 16:07:03 -0800 From: please_reply_to_security@....com To: security-announce@...t.sco.com, bugtraq@...urityfocus.com, full-disclosure@...ts.netsys.com Subject: OpenServer 5.0.6 OpenServer 5.0.7 : A vulnerability in TCP -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ SCO Security Advisory Subject: OpenServer 5.0.6 OpenServer 5.0.7 : A vulnerability in TCP Advisory number: SCOSA-2005.3 Issue date: 2005 February 28 Cross reference: sr890248 fz529385 erg712599 CAN-2004-0230 ______________________________________________________________________________ 1. Problem Description TCP, when using a large Window Size, makes it easier for remote attackers to guess sequence numbers and cause a denial of service (connection loss) to persistent TCP connections by repeatedly injecting a TCP RST packet, especially in protocols that use long-lived connections, such as BGP. Paul Watson performed a statistical analysis of this attack when the ISN is not known and has pointed out that such an attack could be viable when specifically taking into account the TCP Window size. He has also created a proof-of-concept tool demonstrating the practicality of the attack. The National Infrastructure Security Co-Ordination Center (NISCC) has published an advisory summarizing Paul Watson's analysis in "NISCC Vulnerability Advisory 236929." The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0230 to this issue. 2. Vulnerable Supported Versions System Binaries ---------------------------------------------------------------------- OpenServer 5.0.6 TCP driver OpenServer 5.0.7 TCP driver 3. Solution The proper solution is to install the latest packages. 4. OpenServer 5.0.7 4.1 Location of Fixed Binaries ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.3 4.2 Verification MD5 (VOL.000.000) = 0f3182ee23d7bd90359d7ac0973dd44e md5 is available for download from ftp://ftp.sco.com/pub/security/tools 4.3 Installing Fixed Binaries Upgrade the affected binaries with the following sequence: 1) Download the VOL* files to the /tmp directory 2) 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.sco.com/pub/updates/OpenServer/SCOSA-2005.3 5.2 Verification MD5 (VOL.000.000) = 0f3182ee23d7bd90359d7ac0973dd44e md5 is available for download from ftp://ftp.sco.com/pub/security/tools 5.3 Installing Fixed Binaries Upgrade the affected binaries with the following sequence: 1) Download the VOL* files to the /tmp directory 2) 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.uniras.gov.uk/vuls/2004/236929/index.htm http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0230 http://www.us-cert.gov/cas/techalerts/TA04-111A.html 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 sr890248 fz529385 erg712599. 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 SCO would like to thank The National Infrastructure Security Co-Ordination Centre (NISCC), Paul Watson and Tim Newsham. ______________________________________________________________________________ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (SCO/UNIX_SVR5) iD8DBQFCIy37aqoBO7ipriERAqc3AJ9IwDOx3iRiSmJNqbHonAiL/MahBACcCLTn BffHZGatoqplBgcjoEgAvcA= =eNiU -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
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