From ciac@tholia.llnl.gov Fri Jun 26 21:55:58 1998 From: CIAC Mail User To: ciac-bulletin@tholia.llnl.gov Date: Thu, 25 Jun 1998 10:13:32 -0700 (PDT) Subject: CIAC Bulletin I-065: SunOS ufsrestore Buffer Overflow Vulnerability [ For Public Release ] -----BEGIN PGP SIGNED MESSAGE----- __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SunOS ufsrestore Buffer Overflow Vulnerability June 24, 1998 21:00 GMT Number I-065 ______________________________________________________________________________ PROBLEM: A buffer overflow vulnerability has been identified in the ufsrestore utility, used to restore files from backup media created with the ufsdump command. This is different from the vulnerability identified in CIAC Bulletin I-049 and Sun Security Bulletin #00169. PLATFORM: SunOS 5.5.1, 5.5.1_x86, 5.5 and 5.5_x86. DAMAGE: If exploited, this vulnerability allows local users to gain root access. SOLUTION: Apply workaround until patches are available. ______________________________________________________________________________ VULNERABILITY Intruders are currently exploiting this vulnerability to get ASSESSMENT: root access after breaking into a user account. ______________________________________________________________________________ SunOS ufsrestore Buffer Overflow Vulnerability CIAC has learned that there is a new vulnerability in the ufsrestore utility in SunOS 5.5.1, 5.5.1_x86, 5.5 and 5.5_x86. Note that this is not the same vulnerability described in CIAC Bulletin I-049 and Sun Security Bulletin #00169. The new vulnerability is a buffer overflow vulnerability and is currently being exploited by intruders to get root access after breaking into a user account. Sun is working on patches for this utility and estimate that the patches will be available in two to three weeks. Until then, system managers should use one of the following workarounds to protect their systems. 1. If you are not using the utilities or don't expect to use them very often, copy the files onto a floppy disk and delete them from your system. If you need the utilities, you can copy them back onto your system from the floppy. The files remove are: /usr/lib/fs/ufs/ufsrestore /usr/lib/fs/ufs/ufsdump The following files are links to the files in /usr/lib/fs/ufs and do not need to be changed. /usr/sbin/ufsrestore /usr/sbin/ufsdump 2. The second option is to change the permissions on the files so that only the root user can run them. Login as root and execute the following commands to change the permissions. Be sure the files are owned by root. chmod 500 /usr/lib/fs/ufs/ufsrestore chmod 500 /usr/lib/fs/ufs/ufsdump If at some future date you need to change the permissions back to the original values, login as root and execute the following two commands. chmod 4555 /usr/lib/fs/ufs/ufsrestore chmod 6555 /usr/lib/fs/ufs/ufsdump _____________________________________________________________________________ CIAC wishes to acknowledge the contributions of Sun Microsystems Inc. for the information contained in this bulletin. _____________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. 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LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) I-055: SGI IRIX Vulnerabilities (NetWare Client, diskperf/diskalign I-056: Cisco PIX Private Link Key Processing and Cryptography Vulnerabilities I-057: FreeBSD NFS Kernel Code Error I-058: SunOS rpc.nisd Vulnerability I-059: SUN ftpd Vulnerability I-060: SGI IRIX OSF/DCE Denial of Service Vulnerability I-061: SGI IRIX mediad(1M) Vulnerability I-062: SGI IRIX BIND DNS named(1M) Vulnerability I-063: RSI BSDI rlogind Vulnerability I-064: SGI IRIX mail(1), rmail(1M), sendmail(1M) Vulnerabilities -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBNZKAD7nzJzdsy3QZAQEkygP/Q5Us6EzRzwUoEsm/cn7d0tNA/wo/w/Zo MUn3giufs7+/fjPTl5cQ67zgFI+pdtA48oTIQsiA2mItMgAgoWlVHI2j5bgaAOsb YIIWg/gSghc4mxy5Fm/5NITs6kOrfCiHo19VCAxaC5C0zjOa0abBp8YD3URHorcB QDwEC7C2i7c= =Y+/w -----END PGP SIGNATURE-----