Date: Fri, 14 Apr 2000 11:47:23 -0700
From: Katie Moussouris <[email protected]>
To: [email protected]Subject: [TL-Security-Announce] PAM and usermode TLSA2000009-1
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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.
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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.
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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:
ftp://ftp.turbolinux.com/pub/updates/6.0/security/pam-0.72-3.i386.rpm
Run the above command again, where ftp_path_to_filename is:
ftp://ftp.turbolinux.com/pub/updates/6.0/security/usermode-1.18-1.i386.rpm
The source rpms can be downloaded here:
ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/pam-0.72-3.src.rpmftp://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
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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.
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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:
[email protected]
______________________________________________________________________________
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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