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security advisorySuSEcritical severity

OpenSUSE 7.x: 2002:051 High: nfsserver/rpc.lockd Exploit Risk

Security problems have been found in the client code of the NIS (Network Information System, aka yp - yellow pages) subsytem.. ______________________________________________________________________________ SuSE Security Announcement Package: ypbind/ypclient Announcement-ID: SuSE-SA:2000:042 Date: Wednesday, October 18th, 2000 19:15 MEST Affected SuSE versions: 6.0, 6.1, 6.2, 6.3, 6.4, 7.0 Vulnerability Type: possible remote root compromise Severity (1-10): 8 SuSE default package: yes (starting with SuSE-6.4) Other affected systems: Linux systems using this NIS implementation Content of this advisory: 1) security vulnerability resolved: ypbind/ypclient problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information Security problems have been found in the client code of the NIS (Network Information System, aka yp - yellow pages) subsytem. SuSE distributions before SuSE-6.1 came with the original ypbind program, SuSE-6.2 and later included the ypbind-mt NIS client implementation. ypbind-3.3 (the earlier version) has a format string parsing bug if it is run in debug mode, and (discovered by Olaf Kirch ) leaks file descriptors under certain circumstances which can lead to a DoS. In addition, ypbind-3.3 may suffer from buffer overflows. ypbind-mt, the software shipped with SuSE distributions starting with SuSE-6.2, suffers from a single format string parsing bug. Some of these bugs could allow remote attackers to execute arbitrary code as root. During code audit and testing it turned out that the ypbind-3.x softwarein the SuSE-6.1 distribution and earlier needs a major overhaul to make it work both reliable and secure with respect to errors in the code. Basically, this is what happened when Thorsten Kukuk wrote ypbind-mt from scratch in 1998. For the same reason, we are currently unable to produce a working security update package which fixes the known and yet unknown (there may be more) problems in the ypclient packages in the SuSE-6.1 distribution and older. The only efficient workaround for the SuSE-6.1 distribution and older against these bugs for an untrusted, hostile environment is to upgrade to a new distribution base (SuSE-7.0 is recommended) and use the ypclient update packages for this distribution. As of today, there is no exploit known to exist in the wild. For SuSE-6.2 and later distributions we provide update packages as listed below. We recommend to download and install these packages on systems that are NIS/yp clients. Please note that the sources for the ypclient package are contained within the ypserv source rpm. Download the update package from locations described below and install the package with the command `rpm -Uhv file.rpm'. The md5sum for each file is in the line below. You can verify the integrity of the rpm files using the command `rpm --checksig --nogpg file.rpm', independently from the md5 signatures below. i386 Intel Platform: SuSE-7.0 76e4e7f60791db16c5e36fb5dbf60b65 source rpm: e2b1dccaec003f54e4ebbdef84d99a10 SuSE-6.4 e485ea27264fb9c4f890cdf7605ffa30 source rpm: c61c6df2ba1fef2369406b2dcbcd25f1 SuSE-6.3 c1a10cc0a3f72242b136be921f9ae0c1 source rpm: 6f47a880d5e7175dc2b5ff0116d7de4d SuSE-6.2 9050e63cb9f7fac4997968760292a6f1 source rpm: 7ecfaffd8cdb68f73adfd1d6fd27ed39 SuSE-6.1 and older: Please see the problem description above. Sparc Platform: SuSE-7.0 1a38d25c8647f010e2a9879f28de4adf source rpm: 6ba9200e49210f98ca845107b034b981 AXP Alpha Platform: SuSE-6.4 6aea95ca27245eb3df72da7596af3321 source rpm: a4bf635b9ee4bdefc29b7e6e1cf0cf41 SuSE-6.3 b68f8690b7dc554ac9098c83f9c633cd source rpm: ef0a026d078847d0958118bbbc46b99e PPC Power PC Platform: SuSE-6.4 26080b1443a3daa1de64c876ae36e6f2 source rpm: 4f0904d73c98c8b9737d5ac34b7a4dd5 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: Another security announcement is following this advisory. ______________________________________________________________________________ 3) standard appendix: SuSE runs two security mailing lists to which any interested party may subscribe: This email address is being protected from spambots. You need JavaScript enabled to view it. - general/linux/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email to . This email address is being protected from spambots. You need JavaScript enabled to view it. - SuSE's announce-only mailing list. Only SuSE's security annoucements are sent to this list. To subscribe, send an email to . For general information or the frequently asked questions (faq) send mail to: or respectively. ============================================== SuSE's security contact is . ============================================== Regards, Roman Drahtmüller. - - -- - - | Roman Drahtmüller // "Caution: Cape does | SuSE GmbH - Security Phone: // not enable user to fly." | Nürnberg, Germany +49-911-740530 // (Batman Costume warning label) | - - ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. SuSE GmbH makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. Type Bits/KeyID Date User ID pub 2048/3D25D3D9 1999/03/06 SuSE Security Team - -----BEGIN PGP PUBLIC KEY BLOCK----- Version: 2.6.3i mQENAzbhLQQAAAEIAKAkXHe0lWRBXLpn38hMHy03F0I4Sszmoc8aaKJrhfhyMlOA BqvklPLE2f9UrI4Xc860gH79ZREwAgPt0pi6+SleNFLNcNFAuuHMLQOOsaMFatbz JR9i4m/lf6q929YROu5zB48rBAlcfTm+IBbijaEdnqpwGib45wE/Cfy6FAttBHQh 1Kp+r/jPbf1mYAvljUfHKuvbg8t2EIQz/5yGp+n5trn9pElfQO2cRBq8LFpf1l+U P7EKjFmlOq+Gs/fF98/dP3DfniSd78LQPq5vp8RL8nr/o2i7jkAQ33m4f1wOBWd+ cZovrKXYlXiR+Bf7m2hpZo+/sAzhd7LmAD0l09kABRG0JVN1U0UgU2VjdXJpdHkg VGVhbSA8c2VjdXJpdHlAc3VzZS5kZT6JARUDBRA24S1H5Fiyh7HKPEUBAVcOB/9b yHYji1/+4Xc2GhvXK0FSJN0MGgeXgW47yxDL7gmR4mNgjlIOUHZj0PEpVjWepOJ7 tQS3L9oP6cpj1Fj/XxuLbkp5VCQ61hpt54coQAvYrnT9rtWEGN+xmwejT1WmYmDJ xG+EGBXKr+XP69oIUl1E2JO3rXeklulgjqRKos4cdXKgyjWZ7CP9V9daRXDtje63 Om8gwSdU/nCvhdRIWp/Vwbf7Ia8iZr9OJ5YuQl0DBG4qmGDDrvImgPAFkYFzwlqo choXFQ9y0YVCV41DnR+GYhwl2qBd81T8aXhihEGPIgaw3g8gd8B5o6mPVgl+nJqI BkEYGBusiag2pS6qwznZiQEVAwUQNuEtBHey5gA9JdPZAQFtOAf+KVh939b0J94u v/kpg4xs1LthlhquhbHcKNoVTNspugiC3qMPyvSX4XcBr2PC0cVkS4Z9PY9iCfT+ x9WM96g39dAF+le2CCx7XISk9XXJ4ApEy5g4AuK7NYgAJd39PPbERgWnxjxir9g0 Ix30dS30bW39D+3NPU5Ho9TD/B7UDFvYT5AWHl3MGwo3a1RhTs6sfgL7yQ3U+mvq MkTExZb5mfN1FeaYKMopoI4VpzNVeGxQWIz67VjJHVyUlF20ekOz4kWVgsxkc8G2 saqZd6yv2EwqYTi8BDAduweP33KrQc4KDDommQNDOXxaKOeCoESIdM4p7Esdjq1o L0oixF12Cg==pIeS - -----END PGP PUBLIC KEY BLOCK----- . Uncover crucial guidance from SuSE concerning security flaws in ypbind and ypclient that impact Network Information Service (NIS), emphasizing the importance of swift updates.. NIS Vulnerability, ypbind Update, SuSE Security Advisory, Remote Root Threat. . Severity: Critical. LinuxSecurity.com Team

Oct 18, 2000 •Critical SuSE