Originally Published: Saturday, 4 September 1999 Author: Quentin Cregan
Published to: news_enhance_security/Security News Page: 1/1 - [Printable]

RedHat announces buffer overflow in inews

New packages for INN are available for all Red Hat Linux platforms. This version of the package fixes a buffer overrun problem discovered in the inews program, which is part of the INN distribution. No active exploits of the problem have been found so far

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- --------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: Buffer overflow problem in the inews program Advisory ID: RHSA-1999:033-01Issue date: 1999-09-01 Keywords: inn inews buffer overflow - ---------------------------------------------------------------------

1. Topic: New packages for INN are available for all Red Hat Linux platforms. This version of the package fixes a buffer overrun problem discovered in the inews program, which is part of the INN distribution. No active exploits of the problem have been found so far.

2. Bug IDs fixed:N/A.

3. Relevant releases/architectures:Red Hat Linux 6.0, all architectures

4. Obsoleted by:

5. Conflicts with:

6. RPMs required:Red Hat Linux 6.0:

================== Intel: ftp://updates.redhat.com//6.0/i386/inn-2.2.1-1.i386.rpm ftp://updates.redhat.com//6.0/i386/inn-devel-2.2.1-1.i386.rpm

Alpha: ftp://updates.redhat.com//6.0/alpha/inn-2.2.1-1.alpha.rpm ftp://updates.redhat.com//6.0/alpha/inn-devel-2.2.1-1.alpha.rpm

Sparc: ftp://updates.redhat.com//6.0/sparc/inn-2.2.1-1.sparc.rpm ftp://updates.redhat.com//6.0/sparc/inn-devel-2.2.1-1.sparc.rpm

Source packages: ftp://updates.redhat.com//6.0/SRPMS/inn-2.2.1-1.src.rpm

Red Hat Linux 5.2: ==================

Intel: ftp://updates.redhat.com//5.2/i386/inn-2.2.1-0.5.2.i386.rpm ftp://updates.redhat.com//5.2/i386/inn-devel-2.2.1-0.5.2.i386.rpm

Alpha: ftp://updates.redhat.com//5.2/alpha/inn-2.2.1-0.5.2.alpha.rpm ftp://updates.redhat.com//5.2/alpha/inn-devel-2.2.1-0.5.2.alpha.rpm

Sparc: ftp://updates.redhat.com//5.2/sparc/inn-2.2.1-0.5.2.sparc.rpm ftp://updates.redhat.com//5.2/sparc/inn-devel-2.2.1-0.5.2.sparc.rpm

Source packages: ftp://updates.redhat.com//5.2/SRPMS/inn-2.2.1-0.5.2.src.rpm

Red Hat Linux 4.2: ==================

Intel: ftp://updates.redhat.com//4.2/i386/inn-2.2.1-0.4.2.i386.rpm ftp://updates.redhat.com//4.2/i386/inn-devel-2.2.1-0.4.2.i386.rpm ftp://updates.redhat.com//4.2/noarch/cleanfeed-0.95.7b-0.4.2.noarch.rpm

Alpha: ftp://updates.redhat.com//4.2/alpha/inn-2.2.1-0.4.2.alpha.rpm ftp://updates.redhat.com//4.2/alpha/inn-devel-2.2.1-0.4.2.alpha.rpm ftp://updates.redhat.com//4.2/noarch/cleanfeed-0.95.7b-0.4.2.noarch.rpm

Sparc: ftp://updates.redhat.com//4.2/sparc/inn-2.2.1-0.4.2.sparc.rpm ftp://updates.redhat.com//4.2/sparc/inn-devel-2.2.1-0.4.2.sparc.rpm ftp://updates.redhat.com//4.2/noarch/cleanfeed-0.95.7b-0.4.2.noarch.rpm

Source packages: ftp://updates.redhat.com//4.2/SRPMS/cleanfeed-0.95.7b-0.4.2.src.rpm ftp://updates.redhat.com//4.2/SRPMS/inn-2.2.1-0.4.2.src.rpm

7. Problem description:

INN versions 2.2 and earlier have a buffer overflow-related security condition in the inews program. inews is a program used to inject new postings into the news system. It is used by many news reading programs and scripts. The default installation is with inews setgid to the news group and world executable.

It's possible that exploiting the buffer overflow could give the attacker news group privileges, which could possibly be extended to root access. Note that this chain of elevation of privileges is theoretical rather than actual; the ability of an attacker to do this indicates bugs in other portions of INN. However, given the degree to which INN trusts the news user and news group, it's not unlikely that such bugs exist. No case of this being exploited has been shown yet. If you run a news server with no local readers (i.e. all your clients are remote) then you can remove the setgid-bit on inews:

chmod 0550 inews.

The rnews program, used to feed news via uucp, is setuid to the uucp user. No buffer overflow problems have been found in rnews, but if you don't run uucp on your machine, then we recommend disabling the setuid bit on rnews:

chown news rnews chgrp news rnews chmod 0550 rnews

Red Hat Linux releases 4.2 and 5.2 shipped with a version of INN that is no longer being maintained. We have back-ported the latest 2.2.1 INN version to those older Red Hat Linux releases. The new package will not be an exact drop in for the older packages, so it is advisable to save you config files first before starting the migration to the new code base. Alternatively you can implement some of the solutions described above if you do not want to update to a new version of INN. Also, on Red Hat Linux 4.2 inn will require a new package named cleanfeed that is also shipped as part of this advisory. Thanks go to the members of the BUGTRAQ mailing list for bringing this issue to our attention.

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 - -------------------------------------------------------------------------- 71dfbbfaddc1596f1e6357562691e3e5 i386/inn-2.2.1-1.i386.rpm 2201608f6d72d96041998349b401061c i386/inn-devel-2.2.1-1.i386.rpm 5dad0596a6db0beace1441484229cb35 alpha/inn-2.2.1-1.alpha.rpm fbc0789c46f953dffdd3503551f2a293 alpha/inn-devel-2.2.1-1.alpha.rpm b8d18a074b1e703e386a9b514e099653 sparc/inn-2.2.1-1.sparc.rpm b539e8f684279b4e607d475d5225844d sparc/inn-devel-2.2.1-1.sparc.rpm 7c58191dc271e462e59e97e58735e52f SRPMS/inn-2.2.1-1.src.rpm a954d249e706103bfea29247849232b7 i386/inn-2.2.1-0.5.2.i386.rpm 2e509990e05ff6117752f261076853d1 i386/inn-devel-2.2.1-0.5.2.i386.rpm 1148e5441e47cae968e661e01061b886 alpha/inn-2.2.1-0.5.2.alpha.rpm 8b872171e04e1caecf8d17335842e87e alpha/inn-devel-2.2.1-0.5.2.alpha.rpm 7a751e48014dff1da12a5aa59e2ff35e sparc/inn-2.2.1-0.5.2.sparc.rpm 0199e603c355e349d8b8f61360ab10a6 sparc/inn-devel-2.2.1-0.5.2.sparc.rpm dc1019ada503f1051149334f914c5884 SRPMS/inn-2.2.1-0.5.2.src.rpm 9c2a193b74265cec65eb5ff9f98cafad i386/inn-2.2.1-0.4.2.i386.rpm 0a4bfe653baecd8d7f84ea08c12aaa0c i386/inn-devel-2.2.1-0.4.2.i386.rpm c6d567d2e6e90d3d71c49b69ee5de44c alpha/inn-2.2.1-0.4.2.alpha.rpm 47de4209af226594892409befcfd6c79 alpha/inn-devel-2.2.1-0.4.2.alpha.rpm 249cb97d48d3a5980bf1338a0c29a513 sparc/inn-2.2.1-0.4.2.sparc.rpm 6e744b632df7b55db4ca3a48b8ac134b sparc/inn-devel-2.2.1-0.4.2.sparc.rpm eb286312a58ca7d5fa62a7cdaff24993 noarch/cleanfeed-0.95.7b-0.4.2.noarch.rpm 08ff66b48fd3303b3cff540082b19256 SRPMS/cleanfeed-0.95.7b-0.4.2.src.rpm bf58614855adb83a8814b3b35e7ebe58 SRPMS/inn-2.2.1-0.4.2.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-

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