=========================================================================== CA-94:02 CERT Advisory February 14, 1994 Revised Patch for SunOS /usr/etc/rpc.mountd Vulnerability --------------------------------------------------------------------------- *** THIS IS A REVISED CERT ADVISORY *** *** IT CONTAINS NEW VULNERABILITY AND PATCH INFORMATION *** *** SUPERSEDES CERT ADVISORY CA-91:09 and CA-92:12 *** The CERT Coordination Center has received information concerning a vulnerability in /usr/etc/rpc.mountd in Sun Microsystems, Inc. SunOS 4.1.1, 4.1.2, 4.1.3, and 4.1.3c. SunOS 4.1.3.u.1, Solaris 2.x, and Solbourne's 4.1B and 4.1C are not vulnerable. Sun has produced a patch for this vulnerability for sun3 and sun4 architectures. It is available through your local Sun Answer Center as well as through anonymous FTP from the ftp.uu.net system in the /systems/sun/sun-dist directory or from the ftp.eu.net system in the /sun/fixes directory. This vulnerability is currently being exploited. Please review CERT Advisory CA-94:01 'Ongoing Network Monitoring Attacks'. ----------------------------------------------------------------------------- I. Description If an access list of hosts within /etc/exports is a string over 256 characters or if the cached list of netgroups exceeds the cache capacity then the filesystem can be mounted by anyone. II. Impact Unauthorized remote hosts will be able to mount the filesystem. This will allow unauthorized users read and write access to files on mounted filesystem. III. Solution Obtain and install the appropriate patch following the instructions included with the patch. Patch-ID Filename BSD MD5 Checksum Checksum 100296-04 100296-04.tar.Z 42492 40 20a76c75abadd3360ad92091a25ceb3c --------------------------------------------------------------------------- If you believe that your system has been compromised, contact the CERT Coordination Center or your representative in Forum of Incident Response and Security Teams (FIRST). Internet E-mail: cert@cert.org Telephone: 412-268-7090 (24-hour hotline) CERT personnel answer 8:30 a.m.-5:00 p.m. EST(GMT-5)/EDT(GMT-4), and are on call for emergencies during other hours. CERT Coordination Center Software Engineering Institute Carnegie Mellon University Pittsburgh, PA 15213-3890 Past advisories, information about FIRST representatives, and other information related to computer security are available for anonymous FTP from info.cert.org.