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AUSCERT External Security Bulletin Redistribution
ESB-2000.004 -- RHSA-2000:001-02
New version of usermode fixes security bug
05 January 2000
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RedHat Inc., has released the following advisory concerning a vulnerability
in 'userhelper' on Red Hat Linux 6.0 and 6.1 on all architectures.
This vulnerability may be exploited by local users to gain root access.
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Red Hat, Inc. Security Advisory
Synopsis: New version of usermode fixes security bug
Advisory ID: RHSA-2000:001-02
Issue date: 2000-01-04
Updated on: 2000-01-04
Keywords: root userhelper pam
Cross references:
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1. Topic:
A security bug has been discovered and fixed in the userhelper program.
2000-01-04: SysVinit package added for Red Hat Linux 6.0 to fix
a dependency problem.
2. Relevant releases/architectures:
Red Hat Linux 6.0 and 6.1, all architectures.
3. Problem description:
A security bug was found in userhelper; the bug can be exploited to
provide local users with root access.
The bug has been fixed in userhelper-1.17, and pam-0.68-10 has been
modified to help prevent similar attacks on other software in the future.
2000-01-04: Red Hat Linux 6.0 users will need to upgrade to
SysVinit-2.77-2 to fix a minor dependency issue.
4. Solution:
For each RPM for your particular architecture, run:
rpm -Uvh <filename>
where filename is the name of the RPM.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla/ for more info):
6. Obsoleted by:
7. Conflicts with:
8. RPMs required:
Red Hat Linux 6.1:
Intel:
ftp://updates.redhat.com/6.1/i386/pam-0.68-10.i386.rpm
ftp://updates.redhat.com/6.1/i386/usermode-1.17-1.i386.rpm
Alpha:
ftp://updates.redhat.com/6.1/alpha/pam-0.68-10.alpha.rpm
ftp://updates.redhat.com/6.1/alpha/usermode-1.17-1.alpha.rpm
Sparc:
ftp://updates.redhat.com/6.1/sparc/pam-0.68-10.sparc.rpm
ftp://updates.redhat.com/6.1/sparc/usermode-1.17-1.sparc.rpm
Source packages:
ftp://updates.redhat.com/6.1/SRPMS/pam-0.68-10.src.rpm
ftp://updates.redhat.com/6.1/SRPMS/usermode-1.17-1.src.rpm
Red Hat Linux 6.0:
Intel:
ftp://updates.redhat.com/6.1/i386/pam-0.68-10.i386.rpm
ftp://updates.redhat.com/6.1/i386/usermode-1.17-1.i386.rpm
ftp://updates.redhat.com/6.0/i386/SysVinit-2.77-2.i386.rpm
Alpha:
ftp://updates.redhat.com/6.1/alpha/pam-0.68-10.alpha.rpm
ftp://updates.redhat.com/6.1/alpha/usermode-1.17-1.alpha.rpm
ftp://updates.redhat.com/6.0/alpha/SysVinit-2.77-2.alpha.rpm
Sparc:
ftp://updates.redhat.com/6.1/sparc/pam-0.68-10.sparc.rpm
ftp://updates.redhat.com/6.1/sparc/usermode-1.17-1.sparc.rpm
ftp://updates.redhat.com/6.0/sparc/SysVinit-2.77-2.sparc.rpm
Source packages:
ftp://updates.redhat.com/6.1/SRPMS/pam-0.68-10.src.rpm
ftp://updates.redhat.com/6.1/SRPMS/usermode-1.17-1.src.rpm
ftp://updates.redhat.com/6.0/SRPMS/SysVinit-2.77-2.src.rpm
9. Verification:
MD5 sum Package Name
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bffd4388103fa99265e267eab7ae18c8 i386/pam-0.68-10.i386.rpm
2d69859d2b1d2180d254fc263bdccf94 i386/usermode-1.17-1.i386.rpm
f6d639bcbbcb5155364a9cb521f61463 i386/SysVinit-2.77-2.i386.rpm
fed2c2ad4f95829e14727a9dfceaca07 alpha/pam-0.68-10.alpha.rpm
83c69cb92b16bb0eef295acb4c857657 alpha/usermode-1.17-1.alpha.rpm
e411972f5430e3182dd0da946641f37d alpha/SysVinit-2.77-2.alpha.rpm
350662253d09b17d0aca4e9c7a511675 sparc/pam-0.68-10.sparc.rpm
d89495957c9a438fda657b8a4a5f5578 sparc/usermode-1.17-1.sparc.rpm
91747cdbe9d7f66d608a1f35177ff200 sparc/SysVinit-2.77-2.sparc.rpm
f9ad800f56b7bb05ce595bad824a990d SRPMS/pam-0.68-10.src.rpm
1d3b367d257a57de7d834043a4fcd87a SRPMS/usermode-1.17-1.src.rpm
c40b184c60f212f3fdd484eeb2de6f71 SRPMS/SysVinit-2.77-2.src.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 <filename>
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 <filename>
10. References:
Thanks to dildog@l0pht.com for finding this bug.
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