=============================================================================== Security Advisory CERT-NL =============================================================================== Author/Source : CERT-NL (Teun Nijssen) Index : S-93-18 Distribution : World Page : 1 Classification: External Version: Final Subject : Netware 4.x LOGIN.EXE vulnerability Date : 16-Sep-93 ============================================================================== CERT-NL has received information concerning a vulnerability in Novell's Netware 4.x LOGIN.EXE The following text is taken verbatim from the advisory of CERT-CC, one of CERT-NL's sister organisations in the USA. =========================================================================== 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. --------------------------------------------------------------------------- CERT-NL thanks CIAC for sharing this information with its FIRST partners and advises its constituency to follow the CERT-CC guidelines in this advisory. ============================================================================== CERT-NL is the Computer Emergency Response Team, located in The Netherlands. CERT-NL is a Full Member of the Forum of Incident Response and Security Teams (FIRST). The constituency of CERT-NL are the SURFnet connected institutions. Past CERT-NL Security Bulletins and other CERT-NL related material can be found on the anonymous FTP server of SURFnet bv: "ftp.nic.surfnet.nl" [192.87.46.3], in the directory "surfnet/net-security/cert-nl/docs/bulletin". This information is also available using email. Send an email saying "help" to "mailserv@nic.surfnet.nl". In case of computer or network security problems please contact CERT-NL or the CERT of your own constituency. Please be aware of the fact that we are one (when DST is in effect two) hour(s) ahead of Universal Time Coordinated (i.e. UTC+0100 (UTC+0200)). Email: cert-nl@surfnet.nl Phone: +31 30 310290 Fax: +31 30 340903 Snailmail: SURFnet bv Attn. CERT-NL P.O. Box 19035 NL - 3501 DA UTRECHT The Netherlands A 7*24h phonenumber is available to SURFnet SSC's and FIRST members on request =============================================================================