From k8e@TURBOLINUX.COM Thu Jul 13 00:26:30 2000 From: "Katherine M. Moussouris" X-Sender: k8e@qubit.dev.us.tlan To: BUGTRAQ@SECURITYFOCUS.COM Date: Tue, 30 May 2000 14:46:08 -0700 Reply-To: tl-security-announce@www1.turbolinux.com Subject: [TL-Security-Announce] xlockmore TLSA2000012-1.txt -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ TurboLinux Security Announcement Package: xlockmore-4.16 and earlier Date: Mon May 29 20:29:06 PDT 2000 Affected TurboLinux versions: 6.0.4 and earlier; 6.0.5 NOT affected Vulnerability Type: local users can view shadowed password file TurboLinux Advisory ID#: TLSA2000012-1 Credits: This vulnerability was discovered by COVERT labs at Network Associates, Inc., published to BUGTRAQ Mon, 29 May 2000. ______________________________________________________________________________ A security hole was discovered in the package mentioned above. Please update the package in your installation as soon as possible or disable the service. ______________________________________________________________________________ 1. Problem Summary From the COVERT labs NAI advisory: "The xlock program locks an X server until a valid password is entered. The command line option -mode provides a user with a mechanism to change the default display shown when the X server is locked. xlock is installed with privileges to obtain password information, although these are dropped as early as possible. An overflow in the -mode command line option allows a malicious attacker to reveal arbitrary portions of xlock's address space including the shadow password file." 2. Impact A local user can use the overflow to read the shadowed password file. 3. Solution Update the package from our ftp server by running the following command: rpm -Fvh ftp_path_to_filename Where ftp_path_to_filename is the following: ftp://ftp.turbolinux.com/pub/updates/6.0/security/xlockmore-4.16.1-1.i386.rpm The source RPM can be downloaded here: ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/xlockmore-4.16.1-1.src.rpm **Note: You must rebuild and install the RPM if you choose to download and install the SRPM. Simply installing the SRPM alone WILL NOT CLOSE THE SECURITY HOLE. Please verify the MD5 checksum of the update before you install: MD5 sum Package Name - ------------------------------------------------------------ 4987a64d63c0e803e61df11c106d33a3 xlockmore-4.16.1-1.i386.rpm fc29032bbef8b9d111b9cadd43954ecc xlockmore-4.16.1-1.src.rpm ______________________________________________________________________________ These packages are GPG signed by Turbolinux for security. Our key is available here: http://www.turbolinux.com/security/tlgpgkey.asc To verify a package, use the following command: rpm --checksig name_of_rpm To examine only the md5sum, use the following command: rpm --checksig --nogpg name_of_rpm **Note: Checking GPG keys requires RPM 3.0 or higher. ______________________________________________________________________________ You can find more updates on our ftp server: ftp://ftp.turbolinux.com/pub/updates/6.0/security/ for TL6.0 Workstation and Server security updates ftp://ftp.turbolinux.com/pub/updates/4.0/security/ for TL4.0 Workstation and Server security updates Our webpage for security announcements: http://www.turbolinux.com/security If you want to report vulnerabilities, please contact: rt-security@turbolinux.com ______________________________________________________________________________ Subscribe to the TurboLinux Security Mailing lists: TL-security - A moderated list for discussing security issues in TurboLinux products. Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security TL-security-announce - An announce-only mailing list for security updates and alerts. Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security-announce ______________________________________________________________________________ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.1 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE5NDY+7eR7bnHQKeQRAi6+AJ4l8YyoByuXICQUoEZx/bij1HoBXACdHRtB 0rh96Bbbd5v8bFPqxdXvIM4= =Cfkp -----END PGP SIGNATURE----- _______________________________________________ TL-Security-Announce mailing list TL-Security-Announce@www.turbolinux.com http://www.turbolinux.com/mailman/listinfo/tl-security-announce