-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =============================================================================== >> CERT-NL, 01-Mar-2000 << >> All CERT-NL information has been moved to http://cert.surfnet.nl. Links << >> to CERT-NL information contained in this advisory are therefore outdated. << >> << >> CERT-NL also has stopped the CERT-CC-Mirror service. Due to this the << >> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the << >> complete CERT-CC advisory texts: http://www.cert.org << =============================================================================== =============================================================================== Security Advisory CERT-NL =============================================================================== Author/Source : CERT-NL (Erik-Jan Bos) Index : S-93-25 Distribution : Kernel Page : 1 Classification: External Version: Final Subject : SunOS/Solbourne loadmodule and modload Vulnerability Date : 16-Dec-93 =============================================================================== CERT-NL has received information concerning a vulnerability in /usr/etc/modload and $OPENWINHOME/bin/loadmodule in Sun Microsystems, Inc. SunOS 4.1.1, 4.1.2, 4.1.3, and 4.1.3c and OpenWindows 3.0 on all sun4 and Solbourne Computer, Inc. architectures. The problem does not exist in Solaris 2.x, Solaris x86, and sun3 architectures (OpenWindows 3.0 was not released for the sun3 architecture). Sun has produced a patch for these vulnerabilities for sun4 architectures. It is available through your local Sun Answer Center as well as through anonymous FTP from ftp.nic.surfnet.nl [192.87.46.3] in the surfnet/net-security/cert-nl/patches/sun-fixes directory. Solbourne has announced a workaround that is included below. Please note that this advisory supersedes CERT Coordination Center Advisory CA-91:22 "SunOS OpenWindows Vulnerability". This Advisory was not issued by CERT-NL. - ----------------------------------------------------------------------------- I. Description loadmodule(8) and modload(8) can be exploited to execute a user's program using the effective UID of root. II. Impact This vulnerability allows a local user to gain root access. III. Solution A. SunOS Solution Obtain and install the appropriate patches according to the instructions included with the patches. Module Patch ID Filename ---------- --------- --------------- loadmodule 100448-02 100448-02.tar.Z BSD Checksum = 19410 5 MD5 Checksum = 0215910cf65e055ed3042070bd961a22 modload 101200-02 101200-02.tar.Z BSD Checksum = 41677 28 MD5 Checksum = 626ab2917204eb6e6eb5f165cca3e908 B. Solbourne Solution Solbourne systems do not support the "loadmodule" functionality. This vulnerability can be fixed on Solbourne systems by removing the setuid bit: chmod 0755 /usr/openwin/bin/loadmodule The modload program does not need to replaced or changed. - --------------------------------------------------------------------------- CERT-NL wishes to thank the CERT Coordination Center and Sun Microsystems, Inc. and Solbourne Computers, Inc. for their support in responding to this problem and distributing the necessary information and patches. - --------------------------------------------------------------------------- ============================================================================== CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet is the Dutch network for educational, research and related institutes. CERT-NL is a member of the Forum of Incident Response and Security Teams (FIRST). All CERT-NL material is available under: http://cert.surfnet.nl/ In case of computer or network security problems please contact your local CERT/security-team or CERT-NL (if your institute is NOT a SURFnet customer please address the appropriate (local) CERT/security-team). CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer, i.e. UTC+0100 in winter and UTC+0200 in summer (DST). Email: cert-nl@surfnet.nl ATTENDED REGULARLY ALL DAYS Phone: +31 302 305 305 BUSINESS HOURS ONLY Fax: +31 302 305 329 BUSINESS HOURS ONLY Snailmail: SURFnet bv Attn. CERT-NL P.O. Box 19035 NL - 3501 DA UTRECHT The Netherlands NOODGEVALLEN: 06 22 92 35 64 ALTIJD BEREIKBAAR EMERGENCIES : +31 6 22 92 35 64 ATTENDED AT ALL TIMES CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES: THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED* PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU. =============================================================================== -----BEGIN PGP SIGNATURE----- Version: PGP 6.5.1i iQA/AwUBOL6WDDSYjBqwfc9jEQJF8ACcD3mEqw7ZuMf46aXzUjA8Of4YCaoAoLoc Dp5DSOx7Mb+zu244cDF6lmFh =K6PT -----END PGP SIGNATURE-----