Roman Drahtmueller writes: [snip]

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

An integer overflow has been discovered in the xdr_array() function, contained in the Sun Microsystems RPC/XDR library, which is part of the glibc library package on all SuSE products. This overflow allows a remote attacker to overflow a buffer, leading to remote execution of arbitrary code supplied by the attacker.

There is no temporary workaround for this security problem other than disabling all RPC based server and client programs. The permanent solution is to update the glibc packages with the update packages listed below.

Notes, Special installation instructions:

* The update packages for the SuSE Linux distributions 7.0 and 7.1 have not been built yet. The packages for these distributions will be published in approximately two weeks (mid September) from now.

[snip] Umm, Roman, that isn't much help. You might as well say "don't use your system for 2 weeks". Why the long delay for 7.0 and 7.1? I don't like to whine, but geez... -- Alan Hadsell If brute force doesn't work, you aren't using enough.

Roman, any news about the 7.0 builds of these libraries? Still can't see them on the website. Thanks, Selcuk On Fri, 30 Aug 2002, Roman Drahtmueller wrote:

-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

SuSE Security Announcement

Package: glibc Announcement-ID: SuSE-SA:2002:031 Date: Friday, Aug 30th 2002 19:00 MEST Affected products: 7.0, 7.1, 7.2, 7.3, 8.0 SuSE Linux Database Server, SuSE eMail Server III, SuSE Linux Enterprise Server, SuSE Linux Firewall on CD SuSE Linux Connectivity Server SuSE Linux Office Server Vulnerability Type: local/remote privilege escalation Severity (1-10): 6 SuSE default package: yes Cross References: CAN-2002-0391, CERT CA-2002-25

Content of this advisory: 1) security vulnerability resolved: glibc problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - ethereal 3) standard appendix (further information)

______________________________________________________________________________

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

An integer overflow has been discovered in the xdr_array() function, contained in the Sun Microsystems RPC/XDR library, which is part of the glibc library package on all SuSE products. This overflow allows a remote attacker to overflow a buffer, leading to remote execution of arbitrary code supplied by the attacker.

There is no temporary workaround for this security problem other than disabling all RPC based server and client programs. The permanent solution is to update the glibc packages with the update packages listed below.

Notes, Special installation instructions:

* The update packages for the SuSE Linux distributions 7.0 and 7.1 have not been built yet. The packages for these distributions will be published in approximately two weeks (mid September) from now.

* The names of both the source RPM as well as the binary RPM (sub-) packages have changed between different SuSE Linux products. Overview: dist | source-RPM | shared libs | static libs,header| profiling ----------------------------------------------------------------------- 7.0 libc shlibs libc libd all SuSE products after and including SuSE Linux 7.1 glibc glibc glibc-devel glibc-profile

Find out which of the four packages are installed on your system according to the package names in the table. Use the command rpm -q name_of_package to query the package database for each name. If you have your package list, download the packages that you need from the URLs as listed below. Verify their integrity and authenticity following the guidelines as described in section 3) of this security announcement.

* PRECAUTIONS The shared libraries package of the glibc is the most sensitive part of a running Linux system, and modifications to it should be handled with special care. During the update of the shlibs/glibc package, runtime-linking the shared libraries is likely to fail for processes that execute a new binary with the execve(2) system call. Therefore, we recommend to bring a system to single user mode ("init S") to perform the package update. If this is not applicable for operational reasons, a system receiving the update should be kept as quiet as possible (no shell scripts of any kind, no cron jobs, no incoming email).

* After performing the update, you should run the following command on your system: /sbin/ldconfig ldconfig will rebuild the runtime linker cache. If you use YOU (Yast2 Online Update), the ldconfig command will be executed automatically at the end of the update.

The shared libraries that were installed on the system before the update have been removed from the filesystem, but they are still in use by the running applications. Therefore, the diskspace as well as the memory will not be freed until the last process that uses these files exits. We recommend to reboot the system to workaround this problem.

Listed below you find the URLs for the update packages for the SuSE Linux products. We only list the packages that are relevant for the security update. Our maintenance customers are being notified individually. The packages are being offered to install from the maintenance web.

Intel i386 Platform:

SuSE-8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/a1/glibc-2.2.5-123.i386.rpm 57bb8eb5e4355539f01ee9dc2e1b790e ftp://ftp.suse.com/pub/suse/i386/update/8.0/d2/glibc-devel-2.2.5-123.i386.rpm cf1a18510a8e78914500c10cc9b79bf0 ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/glibc-profile-2.2.5-123.i386.rpm a03333bb8a0bd77def78b633d790fdb2 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/glibc-2.2.5-123.src.rpm 5ca1e41a5ab22282b0cd0ecc5c286093

SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/a1/glibc-2.2.4-75.i386.rpm b6c392faf66f4a3e23f9f8ba70166496 ftp://ftp.suse.com/pub/suse/i386/update/7.3/d1/glibc-devel-2.2.4-75.i386.rpm f4616d3ddcaef2847b113f2ac7a86866 ftp://ftp.suse.com/pub/suse/i386/update/7.3/d2/glibc-profile-2.2.4-75.i386.rpm a8d5377fc289837c5b9d7902785ea1fe source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/glibc-2.2.4-75.src.rpm 646af6d0e99f54fd03eb0ec99449df36

SuSE-7.2: ftp://ftp.suse.com/pub/suse/i386/update/7.2/a1/glibc-2.2.2-64.i386.rpm 1408ad17ef2bc543cb9ff42cb2813f99 ftp://ftp.suse.com/pub/suse/i386/update/7.2/d1/glibc-devel-2.2.2-64.i386.rpm 283d808402eed8f0f4a8ae2b64b91e17 ftp://ftp.suse.com/pub/suse/i386/update/7.2/d2/glibc-profile-2.2.2-64.i386.rpm d23a61431b924e5c2e09861463f5489d source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/glibc-2.2.2-64.src.rpm 9019bbfd6a6952bb154bdcf7cd8d37d3

Sparc Platform:

SuSE-7.3: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/a1/glibc-2.2.4-43.sparc.rpm df6be3f3b427f4ca6cd27b12dbf16fc8 ftp://ftp.suse.com/pub/suse/sparc/update/7.3/d1/glibc-devel-2.2.4-43.sparc.rpm f90e87513d996235cb2711286371dfae ftp://ftp.suse.com/pub/suse/sparc/update/7.3/d2/glibc-profile-2.2.4-43.sparc.rpm bc659d5181c4d571950821a978fa6ab2 source rpm(s): ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/glibc-2.2.4-43.src.rpm 846403d32700d8173e10932517926fc3

AXP Alpha Platform:

- no new packages -

PPC Power PC Platform:

SuSE-7.3: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/a1/glibc-2.2.4-63.ppc.rpm 2294e4d4777954e7d7c85b6a4e5c8ef7 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/d1/glibc-devel-2.2.4-63.ppc.rpm f68b4b421cd5af4e62a80e9a2c803bd6 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/d2/glibc-profile-2.2.4-63.ppc.rpm 0f837c5c1e4bac59e73a0d23b0d88187 source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/glibc-2.2.4-63.src.rpm fdef49ff7f4ec9546f1e9d8bd46e8fa9

______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- ethereal Multiple overflows and other security related problems have been found in ethereal, a network traffic analyzer program. We have provided update packages on our ftp server that upgrade the ethereal package to the latest version 0.9.6. A backport of the security fixes to the versions supplied in the released SuSE Linux products does not seem feasible. We will not release an own announcement for this specific problem.

- postgresql A buffer overflow has been found in the postgresql database management system. We are about to prepare update packages for this vulnerability.

- openldap2 Andrew McCall reported a problem within the openldap2 package which could lead to a denial of service attack against the slapd server. This problem has been fixed. New openldap2 packages will soon be available.

______________________________________________________________________________

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.

1) execute the command md5sum 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.

2) rpm package signatures provide an easy way to verify the authenticity of an rpm package. Use the command rpm -v --checksig to verify the signature of the package, where 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: a) gpg is installed b) 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 .

- SuSE runs two security mailing lists to which any interested party may subscribe:

suse-security@suse.com - general/linux/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email to .

suse-security-announce@suse.com - SuSE's announce-only mailing list. Only SuSE's security announcements are sent to this list. To subscribe, send an email to .

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

===================================================================== SuSE's security contact is or . The 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 pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key

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Roman Drahtm�ller, SuSE Security. - -- - - | Roman Drahtm�ller // "You don't need eyes to see, | SuSE Linux AG - Security Phone: // you need vision!" | N�rnberg, Germany +49-911-740530 // Maxi Jazz, Faithless | - -

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