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Red Hat, Inc. Security Advisory
Synopsis: Buffer overrun in amd
Advisory ID: RHSA-1999:032-01
Issue date: 1999-08-30
Keywords: amd am-utils buffer overflow remote exploit
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1. Topic:
New packages of am-utils are available for all Red Hat Linux platforms. This
version includes an important security fix for a buffer overrun problem
which is being actively exploited on the Internet..
2. Bug IDs fixed:
4690
3. Relevant releases/architectures:
Red Hat Linux 6.0, all architectures
Red Hat Linux 5.2, all architectures
Red Hat Linux 4.2, all architectures
4. Obsoleted by:
5. Conflicts with:
Red Hat Linux 4.2 shipped originally with a version of amd that is no longer
being maintained. Since Red Hat Linux 5.0 we have switched to am-utils. This
release of am-utils has been backported to 4.2 and it will obsolete the
original 4.2 amd package.
The following is valid for all releases and arcitectures: the default
configuration file format for amd that Red Hat used to ship has been
changed. Initially the /etc/amd.conf file used to be the default map file
that would allow access to the /net hierarchy. Now /etc/amd.conf is the amd
configuration file and the default map is installed as /etc/amd.net.
6. RPMs required (for Red Hat Linux 6.0, 5.2 and 4.2 respectively):
Intel:
ftp://updates.redhat.com/6.0/i386/am-utils-6.0.1s11-1.6.0.i386.rpm
ftp://updates.redhat.com/5.2/i386/am-utils-6.0.1s11-1.5.2.i386.rpm
ftp://updates.redhat.com/4.2/i386/am-utils-6.0.1s11-1.4.2.i386.rpm
Alpha:
ftp://updates.redhat.com/6.0/alpha/am-utils-6.0.1s11-1.6.0.alpha.rpm
ftp://updates.redhat.com/5.2/alpha/am-utils-6.0.1s11-1.5.2.alpha.rpm
ftp://updates.redhat.com/4.2/alpha/am-utils-6.0.1s11-1.4.2.alpha.rpm
Sparc:
ftp://updates.redhat.com/6.0/sparc/am-utils-6.0.1s11-1.6.0.sparc.rpm
ftp://updates.redhat.com/5.2/sparc/am-utils-6.0.1s11-1.5.2.sparc.rpm
ftp://updates.redhat.com/4.2/sparc/am-utils-6.0.1s11-1.4.2.sparc.rpm
Source packages:
ftp://updates.redhat.com/6.0/SRPMS/am-utils-6.0.1s11-1.6.0.src.rpm
ftp://updates.redhat.com/5.2/SRPMS/am-utils-6.0.1s11-1.5.2.src.rpm
ftp://updates.redhat.com/4.2/SRPMS/am-utils-6.0.1s11-1.4.2.src.rpm
7. Problem description:
An explotable buffer overflow security problem in the amd daemon which is
part of the am-utils package has been fixed. This problem is being actively
exploted on the Internet and can be used to gain root access on machines
running amd.
Red Hat recommends anyone to upgrade to the fixed versions immediately.
Thanks to Erez Zadok, the maintainer of am-utils for his assistance in
resolving this problem.
8. Solution:
For each RPM for your particular architecture, run:
rpm -Uvh <filename>
where filename is the name of the RPM.
9. Verification:
MD5 sum Package Name
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0946dbc5539d208625eb27f506177ed2 i386/am-utils-6.0.1s11-1.6.0.i386.rpm
1a1ceb0ed50822776f605e60bbed1afb alpha/am-utils-6.0.1s11-1.6.0.alpha.rpm
b68c6f2780f11ca71947673124bd8f11 sparc/am-utils-6.0.1s11-1.6.0.sparc.rpm
275997ded7f0c85efa6229963e84f668 SRPMS/am-utils-6.0.1s11-1.6.0.src.rpm
e9a06fe4fdf56fdaa9fd984ef5988414 i386/am-utils-6.0.1s11-1.5.2.i386.rpm
617673437abaca052fe950c928722644 alpha/am-utils-6.0.1s11-1.5.2.alpha.rpm
23f3fbdf772eeb7ec67016d1c246225e sparc/am-utils-6.0.1s11-1.5.2.sparc.rpm
01ade16e4171a92fb1c10641846044a7 SRPMS/am-utils-6.0.1s11-1.5.2.src.rpm
cf75db7b60b1d27093685e345153dfcd i386/am-utils-6.0.1s11-1.4.2.i386.rpm
3ec0520caa1a587133ea6cc105f4fc34 alpha/am-utils-6.0.1s11-1.4.2.alpha.rpm
daf8bd0849c584e919fcd5ae8fb1e807 sparc/am-utils-6.0.1s11-1.4.2.sparc.rpm
0aa30be9b859eca2e003bb983c4839f5 SRPMS/am-utils-6.0.1s11-1.4.2.src.rpm
These packages are PGP 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 --nopgp <filename>
10. References:
N/A
Cristian
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Cristian Gafton -- gafton@redhat.com -- Red Hat, Inc.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"How could this be a problem in a country where we have Intel and
Microsoft?" --Al Gore on Y2K
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