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SuSE Linux Advisory: radiusd-cistron

Jun 13, 2003, 15:56 (0 Talkback[s])

SuSE Security Announcement

Package: radiusd-cistron
Announcement-ID: SuSE-SA:2003:030
Date: Friday, Jun 13th 2003 09:32 MET
Affected products: 7.2, 7.3, 8.0
Vulnerability Type: possible remote system compromise
SuSE default package: no
Cross References: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=196063

Content of this advisory:

  1. security vulnerability resolved: handling too large NAS numbers problem description, discussion, solution and upgrade information
  2. pending vulnerabilities, solutions, workarounds:
    • lprng
    • frox
    • poster
    • ghostscript-library
  3. standard appendix (further information)

1) problem description, brief discussion, solution, upgrade information

The package radiusd-cistron is an implementation of the RADIUS protocol. Unfortunately the RADIUS server handles too large NAS numbers not correctly. This leads to overwriting internal memory of the server process and may be abused to gain remote access to the system the RADIUS server is running on.

There is no temporary workaround known.

Please download the update package for your distribution and verify its integrity by the methods listed in section 3) of this announcement. Then, install the package using the command "rpm -Fhv file.rpm" to apply the update.
Our maintenance customers are being notified individually. The packages are being offered to install from the maintenance web.

Please note, missing packages will be published as soon as possible.

Intel i386 Platform:

ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/radiusd-cistron-1.6.6-88.i386.rpm e61fb299edfb092f24b3e455256cf262
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/radiusd-cistron-1.6.6-88.i386.patch.rpm d323307d4bc4c0e4dc0bcef3f848b91f
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/radiusd-cistron-1.6.6-88.src.rpm fc7718319972625612292798092d9a8b

ftp://ftp.suse.com/pub/suse/i386/update/7.3/n3/radiusd-cistron-1.6.4-182.i386.rpm ee949e18ef02e87dffc4b5ea8d5d5ec5
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/radiusd-cistron-1.6.4-182.src.rpm f4f87aab549967c0d4c216c8d2e312a1

ftp://ftp.suse.com/pub/suse/i386/update/7.2/n3/radiusd-cistron-1.6.4-182.i386.rpm e5a20985f79c887739ce0b83539c347b
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/radiusd-cistron-1.6.4-182.src.rpm f5f73b9e9c3e5d338bfddd1a6b2b14d8

Sparc Platform:

ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n3/radiusd-cistron-1.6.4-70.sparc.rpm 7318cc63ec3c29618b81ae6c8eb29fc8
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/radiusd-cistron-1.6.4-70.src.rpm 0212fba5fd8d4ff3e9afe4a8a8802655

PPC Power PC Platform:

ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n3/radiusd-cistron-1.6.4-108.ppc.rpm 30f9920f2a8d2db0e8eb2a0439d61118
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/radiusd-cistron-1.6.4-108.src.rpm 8133911f08442832c383000cb65e70ca

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

  • lprng A race condition in psbanner was fixed that can be abused by local users to overwrite file owned by daemon:lp. New packages are available on out FTP servers.
  • frox The init script of frox handled tmp file in an insecure manner. This behavior can be exploited by local users. New packages are available on out FTP servers.
  • poster A possible buffer overflow due to usage of gets() was fixed which could have been exploited by malicious input data to execute code under the user id of the user running poster. New packages are available on out FTP servers.
  • ghostscript-library Malicious PostScript[tm] files could execute shell commands even if the ghostscript interpreter was invoked with the -dSAFER flag.

3) standard appendix: authenticity verification, additional information

  • Package authenticity verification:

SuSE update packages are available on many mirror ftp servers all over the world. While this service is being considered valuable and important to the free and open source software community, many users wish to be sure about the origin of the package and its content before installing the package. There are two verification methods that can be used independently from each other to prove the authenticity of a downloaded file or rpm package:

  1. md5sums as provided in the (cryptographically signed) announcement.
  2. using the internal gpg signatures of the rpm package.
  3. execute the command md5sum <name-of-the-file.rpm> after you downloaded the file from a SuSE ftp server or its mirrors. Then, compare the resulting md5sum with the one that is listed in the announcement. Since the announcement containing the checksums is cryptographically signed (usually using the key security@suse.de), the checksums show proof of the authenticity of the package. We disrecommend to subscribe to security lists which cause the email message containing the announcement to be modified so that the signature does not match after transport through the mailing list software. Downsides: You must be able to verify the authenticity of the announcement in the first place. If RPM packages are being rebuilt and a new version of a package is published on the ftp server, all md5 sums for the files are useless.
  4. rpm package signatures provide an easy way to verify the authenticity of an rpm package. Use the command rpm -v --checksig <file.rpm> to verify the signature of the package, where <file.rpm> is the filename of the rpm package that you have downloaded. Of course, package authenticity verification can only target an un-installed rpm package file. Prerequisites:
    1. gpg is installed
    2. The package is signed using a certain key. The public part of this key must be installed by the gpg program in the directory ~/.gnupg/ under the user's home directory who performs the signature verification (usually root). You can import the key that is used by SuSE in rpm packages for SuSE Linux by saving this announcement to a file ("announcement.txt") and running the command (do "su -" to be root): gpg --batch; gpg < announcement.txt | gpg --import SuSE Linux distributions version 7.1 and thereafter install the key "build@suse.de" upon installation or upgrade, provided that the package gpg is installed. The file containing the public key is placed at the top-level directory of the first CD (pubring.gpg) and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de .

For general information or the frequently asked questions (faq) send mail to:

<suse-security-info@suse.com> or
<suse-security-faq@suse.com> respectively.

SuSE's security contact is <security@suse.com> or <security@suse.de>. The <security@suse.de> public key is listed below.

The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. In particular, it is desired that the clear-text signature shows proof of the authenticity of the text.
SuSE Linux AG makes no warranties of any kind whatsoever with respect to the information contained in this security advisory.

Type Bits/KeyID Date User ID
pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>