=========================================================================== CA-93:12 CERT Advisory September 16, 1993 Novell LOGIN.EXE Vulnerability --------------------------------------------------------------------------- The CERT Coordination Center has received information concerning a security vulnerability in Novell's NetWare 4.x login program (LOGIN.EXE). This vulnerability affects NetWare 4.0 and 4.01. It does not affect NetWare 2.x, NetWare 3.x, or Netware for UNIX. Novell is making available a security enhancement to the login program for NetWare 4.x. CERT strongly recommends that sites using of Novell NetWare 4.X replace their current LOGIN.EXE program on all affected systems with this security-enhanced version as soon as possible. --------------------------------------------------------------------------- I. Description: A security vulnerability exists in LOGIN.EXE in Novell NetWare 4.X. In some environments, a user's name and password may be temporarily written to disk. II. Impact: User accounts may be readily compromised. III. Solution: NetWare 4.x sites should obtain and install on all affected systems the security-enhanced LOGIN.EXE program. CERT strongly recommends that sites replace their current LOGIN.EXE with the security-enhanced version as soon as possible. This new file is available via anonymous FTP from first.org. The files are located in: Filename Size Checksum -------- ------ ----------------------------- /pub/software/seclog.exe 166276 00193 163 (Standard UNIX Sum) 58886 325 (System V Sum) This file is also available at no charge through NetWare resellers, on NetWire in library 14 of the NOVLIB forum, or by calling +1-800-NETWARE. NetWare customers outside the U.S. may call Novell at +1-303-339-7027 or +31-55-384279 or may fax a request for SECLOG.EXE v4.02 to Novell at +1-303-330-7655 or +31-55-434455. Fax requests should include company name, contact name, postal address, and phone number. The distribution SECLOG.EXE is a self-extracting archive that contains a patched file and a text file of installation instructions. The patch file (LOGIN.EXE) and the text file (SECLOG.TXT) are created by executing the distribution file SECLOG.EXE. After extracting the files, the dir command should produce the following output: SECLOG EXE 166276 xx-xx-xx xx:xxx LOGIN EXE 354859 08-25-93 11:43a SECLOG TXT 5299 09-02-93 11:16a Note that the date and time shown for SECLOG.EXE will reflect when this file was created on your system. To install the patch, follow the directions contained in the text file SECLOG.TXT. After installing the patch, sites should instruct all users to change their passwords. --------------------------------------------------------------------------- The CERT Coordination Center would like to thank Karyn Pichnarczyk and the contribution of CIAC to this advisory. We would also like to acknowledge Richard Colby of Chem Nuclear Geotech, Inc., for reporting this vulnerability to CIAC, and Novell for their efforts in the resolution of this vulnerability. --------------------------------------------------------------------------- If you believe that your system has been compromised, contact the CERT Coordination Center or your representative in FIRST (Forum of Incident Response and Security Teams). 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 cert.org (192.88.209.5).