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Red Hat Security Advisory: Buffer overflows in amd

Aug 31, 1999, 02:02 (0 Talkback[s])

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.


                   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

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

where filename is the name of the RPM.

9. Verification:

MD5 sum                           Package Name

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

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

10. References:
N/A