Originally Published: Friday, 14 April 2000 Author: Alexander Reelsen
Published to: news_enhance_security/Security News Page: 1/1 - [Printable]

TurboLinux Security Announcement - PAM & usermode

TurboLinux released an advisory concerning PAM and usermode rpm's, which allow local root compromise due to the setuid binary 'userhelper'.

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From tl-security-announce-admin@www1.turbolinux.com Fri Apr 14 20:45:33 2000 To: tl-security-announce@turbolinux.com Subject: [TL-Security-Announce] PAM and usermode TLSA2000009-1



TurboLinux Security Announcement

Package: pam-0.70-2 and earlier; usermode-1.6-1 and earlier Date: Fri Apr 14 10:49:07 PDT 2000 Affected TurboLinux versions: 6.0.2 and earlier Vulnerability Type: local root compromise TurboLinux Advisory ID#: TLSA2000009-1 BugTraq ID#: 913 Credits: This vulnerability was posted to Bugtraq in a L0pht security advisory written by Dildog on January 4, 2000. ______________________________________________________________________________

A security hole was discovered in the packages mentioned above. Please update the packages in your installation as soon as possible or disable the service. _____________________________________________________________________________ 1. Problem Summary

Nobody says it like Dildog: "Both 'pam' and 'userhelper' (a setuid binary that comes with the 'usermode-1.15' rpm) follow .. paths. Since pam_start calls down to _pam_add_handler(), we can get it to dlopen any file on disk. 'userhelper' being setuid means we can get root." 2. Impact

A local user can use this vulnerability to get root.

3. Solution

Update the packages from our ftp server by running the following command: rpm -Fvh ftp_path_to_filename

Where ftp_path_to_filename is the following:


Run the above command again, where ftp_path_to_filename is:


The source rpms can be downloaded here:

ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/pam-0.72-3.src.rpm ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/usermode-1.18-1.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 - ------------------------------------------------------------ 91828f6e10423ae7ccae8496b418ad9a pam-0.72-3.i386.rpm 5f24ee48a6f3c6c4760150a1b00b98e9 usermode-1.18-1.i386.rpm

9d6fc46f0b3ce68c8398e152d20e142d pam-0.72-3.src.rpm 85f7906172a00718f0bf30cb76fee945 usermode-1.18-1.src.rpm ______________________________________________________________________________

These packages are GPG signed by Turbolinux for security. Our key is available here:


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:


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 ______________________________________________________________________________

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