From marcdeslauriers@videotron.ca Wed May 18 18:23:09 2005 From: Marc Deslauriers To: bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk Date: Wed, 18 May 2005 16:49:20 -0400 Subject: [FLSA-2005:152771] Updated pam packages fix security issue --------------------------------------------------------------------- Fedora Legacy Update Advisory Synopsis: Updated pam packages fix security issue Advisory ID: FLSA:152771 Issue date: 2005-05-18 Product: Red Hat Linux Keywords: Bugfix CVE Names: CAN-2003-0388 --------------------------------------------------------------------- --------------------------------------------------------------------- 1. Topic: Updated pam packages that fix a security vulnerability are now available. PAM (Pluggable Authentication Modules) is a system security tool that allows system administrators to set an authentication policy without having to recompile programs that handle authentication. 2. Relevant releases/architectures: Red Hat Linux 7.3 - i386 Red Hat Linux 9 - i386 3. Problem description: These updates fix a potential security problem present in the pam_wheel module. These updates correct a bug in the pam_lastlog module which prevented it from properly manipulating the /var/log/lastlog entry for users with very high user IDs. The pam_wheel module is used to restrict access to a particular service based on group membership. If the pam_wheel module was used with the "trust" option enabled, but without the "use_uid" option, any local user would be able to spoof the username returned by getlogin(). The user could therefore gain access to a superuser account without supplying a password. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2003-0388 to this issue. When manipulating the entry in /var/log/lastlog, which corresponds to a given user, the pam_lastlog module calculates the location of the entry by multiplying the UID and the length of an entry in the file. On some systems, the result of this calculation would mistakenly be truncated to 32 bits for users with sufficiently high UIDs. All users of pam should upgrade to these updated packages, which resolve these issues. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs. Please note that this update is also available via yum and apt. Many people find this an easier way to apply updates. To use yum issue: yum update or to use apt: apt-get update; apt-get upgrade This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. This assumes that you have yum or apt-get configured for obtaining Fedora Legacy content. Please visit http://www.fedoralegacy.org/docs for directions on how to configure yum and apt-get. 5. Bug IDs fixed: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=152771 6. RPMs required: Red Hat Linux 7.3: SRPM: http://download.fedoralegacy.org/redhat/7.3/updates/SRPMS/pam-0.75-46.10.legacy.7x.src.rpm i386: http://download.fedoralegacy.org/redhat/7.3/updates/i386/pam-0.75-46.10.legacy.7x.i386.rpm http://download.fedoralegacy.org/redhat/7.3/updates/i386/pam-devel-0.75-46.10.legacy.7x.i386.rpm Red Hat Linux 9: SRPM: http://download.fedoralegacy.org/redhat/9/updates/SRPMS/pam-0.75-62.10.legacy.src.rpm i386: http://download.fedoralegacy.org/redhat/9/updates/i386/pam-0.75-62.10.legacy.i386.rpm http://download.fedoralegacy.org/redhat/9/updates/i386/pam-devel-0.75-62.10.legacy.i386.rpm 7. Verification: SHA1 sum Package Name --------------------------------------------------------------------- bb7b9e1c63be2eb2064b46eacaf8d0ce68594d11 redhat/7.3/updates/i386/pam-0.75-46.10.legacy.7x.i386.rpm 9af62c26654ba14bde7bf6e3b59b9b4f62fd5d35 redhat/7.3/updates/i386/pam-devel-0.75-46.10.legacy.7x.i386.rpm 8f06c0d3a0cb5938206c4d2d20484f325ebcca42 redhat/7.3/updates/SRPMS/pam-0.75-46.10.legacy.7x.src.rpm 622eac1455b5ccb0cf75705cc0f42b3226f9cc31 redhat/9/updates/i386/pam-0.75-62.10.legacy.i386.rpm 18c330ff1ef063f21a3b3c8eb297d09bb004ee67 redhat/9/updates/i386/pam-devel-0.75-62.10.legacy.i386.rpm 8c10c919199f35e5ef785b57f35a8d300d3ea01e redhat/9/updates/SRPMS/pam-0.75-62.10.legacy.src.rpm These packages are GPG signed by Fedora Legacy for security. Our key is available from http://www.fedoralegacy.org/about/security.php You can verify each package with the following command: rpm --checksig -v If you only wish to verify that each package has not been corrupted or tampered with, examine only the sha1sum with the following command: sha1sum 8. References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0388 9. Contact: The Fedora Legacy security contact is . More project details at http://www.fedoralegacy.org --------------------------------------------------------------------- [ Part 2, "OpenPGP digital signature" Application/PGP-SIGNATURE ] [ 259bytes. ] [ Unable to print this part. ]