Stay Secure with the Latest Linux Advisories

security advisoryRed Hatcritical

Red Hat Linux 6.x RHSA-2000:044-02 Critical: Remote Access Issue

Workstations running a display manager may potentially allow remote users to access console devices.. ` --------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: Updated PAM packages are available. Advisory ID: RHSA-2000:044-02 Issue date: 2000-07-21 Updated on: 2000-07-21 Product: Red Hat Linux Keywords: N/A Cross references: N/A --------------------------------------------------------------------- 1. Topic: Updated pam packages are available for Red Hat Linux 6.x. These packages fix a bug that would potentially allow remote users to access console devices and shut down the workstation if the workstation is running a display manager (xdm, gdm, kdm, etc.) with XDMCP enabled. 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 3. Problem description: If a workstation is configured to use a display manager (xdm, gdm, kdm, etc.) AND has XDMCP enabled, it is possible for a user who logs in remotely to use Xnest -query to log in on display :1, which is recognized as the system console. This is the documented behavior for Red Hat Linux 6.0, 6.1, and 6.2. This update disables this feature by default. Users of Red Hat Linux 5.x are not affected because the pam_console.so module was not included in releases prior to 6.0. 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 ( for more info): 11165 - Gnome panel, ssh can allow remote non-root users to halt,reboot 12417 - man pages not installed properly in pam 12430 - /sbin/{pwdb,unix}_chkpwd not stripped 6. RPMs required: Red Hat Linux 6.2: sparc: alpha: i386: sources: 7. Verification: MD5 sum PackageName -------------------------------------------------------------------------- 1e0f9bd6ac389b40c90daba918c419eb 6.2/SRPMS/pam-0.72-20.src.rpm 8834754c1b0fd31ac4fa8f3e54bb7444 6.2/alpha/pam-0.72-20.alpha.rpm b0376fbeb5fa31b1ac118b1831185959 6.2/i386/pam-0.72-20.i386.rpm be592c19f8742f9dca85d6ef19cbfb80 6.2/sparc/pam-0.72-20.sparc.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: 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 Copyright(c) 2000 Red Hat, Inc. `. PAM packages update mitigates critical remote access risk. Advisory ID: RHSA-2000:044-02 with remote console issue.. Red Hat Linux,PAM packages,remote access,console security,bug fix. . Severity: Critical. LinuxSecurity.com Team

Jul 22, 2000 •Critical Red Hat