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Red Hat Security Advisory: glint symlink vulnerability

Sep 21, 2000, 19:26 (0 Talkback[s])

Date: Wed, 20 Sep 2000 22:13:00 -0400
From: bugzilla@REDHAT.COM
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: [RHSA-2000:062-03] glint symlink vulnerability


                   Red Hat, Inc. Security Advisory

Synopsis:          glint symlink vulnerability
Advisory ID:       RHSA-2000:062-03
Issue date:        2000-09-19
Updated on:        2000-09-19
Product:           Red Hat Linux
Keywords:          glint symlink rpm
Cross references:  N/A

1. Topic:

glint blindly follows a symlink in /tmp, overwriting the target file, so it can conceivably be used to destroy any file on the system.

2. Relevant releases/architectures:

Red Hat Linux 5.2 - i386, alpha, sparc

3. Problem description:

If a specific symlink exists in /tmp, glint will open it and write to it when run by root -- so destruction of any file is possible.

Note that glint does not work with RPM 3.0 or higher. If you have RPM 3.0 or higher installed, just uninstall the glint package to remove this vulnerability.

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 (http://bugzilla.redhat.com/bugzilla for more info):

17544 - HUGE race condition in Glint

6. RPMs required:

Red Hat Linux 5.2:

sparc:
ftp://updates.redhat.com/5.2/sparc/glint-2.6.3-1.sparc.rpm

alpha:
ftp://updates.redhat.com/5.2/alpha/glint-2.6.3-1.alpha.rpm

i386:
ftp://updates.redhat.com/5.2/i386/glint-2.6.3-1.i386.rpm

sources:
ftp://updates.redhat.com/5.2/SRPMS/glint-2.6.3-1.src.rpm

7. Verification:

MD5 sum                           Package Name 

b31d4a967bba65a2acc17c16ca75582c 5.2/SRPMS/glint-2.6.3-1.src.rpm
c9e1679ed0f8c1d15878eb8943be4b75 5.2/alpha/glint-2.6.3-1.alpha.rpm
a74b4697402e5ce8f34959ebe2d5327d 5.2/i386/glint-2.6.3-1.i386.rpm
20d74bc2360f6622dc2062654dde84f9 5.2/sparc/glint-2.6.3-1.sparc.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key is available at:
http://www.redhat.com/corp/contact.html

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:

Thanks to Stan Bubrouski nullness@crosswinds.net for finding and reporting this bug.

Copyright(c) 2000 Red Hat, Inc.