Stay Secure with the Latest Linux Advisories

security advisorybuffer overflowcritical

SuSE: 1999-001 Critical: ypserv Buffer Overflow And Injection Risk

The package ypserv is the former "yellow pages", now called NIS information service, which is used for e.g. central network user account management. Several vulnerability exists: ypserv prior 1.3.9 allows an administrator in the NIS domain to inject password tables; rpc.yppasswd prior 1.3.6.92 has got a buffer overflow in the md5 hash generation [SuSE linux is unaffected by this, other linux falvors are]; rpc.yppasswdd prior 1.3.9 allows users to change GECO and login shell values of other users. . ______________________________________________________________________________ SuSE Security Announcement Package: ypserv prior 1.3.9 Date: Tue Sep 28 08:38:50 CEST 1999 Affected: all linux distributions using the ypserv package ______________________________________________________________________________ A security hole was discovered in the package mentioned above. Please update as soon as possible or disable the service if you are using this software on your SuSE Linux installation(s). Other Linux distributions or operating systems might be affected as well, please contact your vendor for information about this issue. Please note, that that we provide this information on "as-is" basis only. There is no warranty whatsoever and no liability for any direct, indirect or incidental damage arising from this information or the installation of the update package. _____________________________________________________________________________ 1. Problem Description The package ypserv is the former "yellow pages", now called NIS information service, which is used for e.g. central network user account management. Several vulnerability exists: ypserv prior 1.3.9 allows an administrator in the NIS domain to inject password tables; rpc.yppasswd prior 1.3.6.92 has got a buffer overflow in the md5 hash generation [SuSE linux is unaffected by this, other linux falvors are]; rpc.yppasswdd prior 1.3.9 allows users to change GECO and loginshell values of other users. 2. Impact If administrator access to one server in the NIS domain is compromised, access to the whole domain can be achieved. On some linux distributions other than SuSE, The rpc.yppasswdd service may halt unexpectedly. It is theoretically possible to execute arbitary code on these systems too. User information can be changed and restricted accounts opened. 3. Solution Updated the package from our FTP server. ______________________________________________________________________________ Here are the md5 checksums of the upgrade packages, please verify these before installing the new packages: abe34d8d1831550059b3fad160fe41f5 ypserv-1.3.9-0.i386.rpm (6.1) 6937d10896d2b5beb18471491ca57781 ypserv-1.3.9-0.alpha.rpm (AXP) 19472f128099cb1e311f2db247acd39f ypserv-1.3.9-0.i386.rpm (6.2) For SuSE 6.0 users: please use the 6.1 version. ______________________________________________________________________________ You will find the update on our ftp-Server: Webpage for patches: https://www.suse.com/de-de/ or try the following web pages for a list of mirrors: https://www.suse.com/de-de/ ______________________________________________________________________________ . A significant vulnerability in ypserv earlier than version 1.3.9 necessitates immediate patches or disabling of the service to avert potential exploitation.. ypserv Vulnerability,NIS Security,Linux Access Management,Buffer Overflow Risk. . Severity: Critical. LinuxSecurity.com Team

Dec 08, 1999 •Critical SuSE