======================================================================= CERT-Renater Note d'Information No. 2000/VULN295 ______________________________________________________________________ DATE : 12/10/2000 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Red Hat Linux 6.x and 7 ====================================================================== --------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: Updated usermode packages available Advisory ID: RHSA-2000:075-05 Issue date: 2000-10-05 Updated on: 2000-10-09 Product: Red Hat Linux Keywords: usermode format-string Cross references: N/A --------------------------------------------------------------------- 1. Topic: Updated usermode packages are now available for Red Hat Linux 6.x and 7. 2. Relevant releases/architectures: Red Hat Linux 6.0 - i386, alpha, sparc Red Hat Linux 6.1 - i386, alpha, sparc Red Hat Linux 6.2 - i386, alpha, sparc Red Hat Linux 6.2EE - i386, alpha, sparc Red Hat Linux 7.0 - i386 Red Hat Linux 7.0J - i386 3. Problem description: The usermode package contains a binary (/usr/bin/userhelper), which is used to control access to programs which are to be executed as root. Because programs invoked by userhelper are not actually running setuid-root, security measures built into recent versions of glibc are not active. If one of these programs supports internationalized text messages, a malicious user can use the LANG or LC_ALL environment variables (which are inherited by userhelper and, in turn, any programs it runs) to create a format-string exploit in these programs. 4. Solution: For each RPM for your particular architecture, run: rpm -Fvh [filename] where filename is the name of the RPM. 5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info): 18046 - Another security hole in usermode/glibc 6. RPMs required: Red Hat Linux 6.0 and 6.1: alpha: ftp://updates.redhat.com/6.2/alpha/usermode-1.36-2.6.x.alpha.rpm ftp://updates.redhat.com/6.2/alpha/SysVinit-2.78-5.alpha.rpm sparc: ftp://updates.redhat.com/6.2/sparc/usermode-1.36-2.6.x.sparc.rpm ftp://updates.redhat.com/6.2/sparc/SysVinit-2.78-5.sparc.rpm i386: ftp://updates.redhat.com/6.2/i386/usermode-1.36-2.6.x.i386.rpm ftp://updates.redhat.com/6.2/i386/SysVinit-2.78-5.i386.rpm sources: ftp://updates.redhat.com/6.2/SRPMS/usermode-1.36-2.6.x.src.rpm ftp://updates.redhat.com/6.2/SRPMS/SysVinit-2.78-5.src.rpm Red Hat Linux 6.2: alpha: ftp://updates.redhat.com/6.2/alpha/usermode-1.36-2.6.x.alpha.rpm sparc: ftp://updates.redhat.com/6.2/sparc/usermode-1.36-2.6.x.sparc.rpm i386: ftp://updates.redhat.com/6.2/i386/usermode-1.36-2.6.x.i386.rpm sources: ftp://updates.redhat.com/6.2/SRPMS/usermode-1.36-2.6.x.src.rpm Red Hat Linux 7.0: i386: ftp://updates.redhat.com/7.0/i386/usermode-1.36-3.i386.rpm sources: ftp://updates.redhat.com/7.0/SRPMS/usermode-1.36-3.src.rpm 7. Verification: MD5 sum Package Name -------------------------------------------------------------------------- 3310677ae7403c683e7947cd86b19344 6.2/SRPMS/SysVinit-2.78-5.src.rpm c96aaae0df6782bb09bd65fb1d6dc69b 6.2/SRPMS/usermode-1.36-2.6.x.src.rpm 546bf7949c5be73b9f28b1819bfbd7c6 6.2/alpha/SysVinit-2.78-5.alpha.rpm afb4ad3a5715c0df6596a19db4d2b3c8 6.2/alpha/usermode-1.36-2.6.x.alpha.rpm ca5b97a1abb47b64d71ef69ab96fcb8a 6.2/i386/SysVinit-2.78-5.i386.rpm c2bac5d41ee077d2db48ed9462802ff0 6.2/i386/usermode-1.36-2.6.x.i386.rpm 4dfeacb8db12af4b2666f2792e1027c1 6.2/sparc/SysVinit-2.78-5.sparc.rpm 8567bb088fb7cab3e298d0df24f8c626 6.2/sparc/usermode-1.36-2.6.x.sparc.rpm 5ac6cca0a146d917e0ec3f6f1e046fa8 7.0/SRPMS/usermode-1.36-3.src.rpm 5d40e125fa0a31f05b8dac9321a1fa88 7.0/i386/usermode-1.36-3.i386.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: http://www.redhat.com/corp/contact.html You can verify each package with the following command: rpm --checksig If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command: rpm --checksig --nogpg 8. References: N/A ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================