Caldera Affected

Notified:  July 08, 2002 Updated: August 13, 2002

Status

Affected

Vendor Statement

Please see Caldera Security Advisory CSSA-2002-034.1 (OpenLinux).

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

Conectiva Affected

Updated:  August 14, 2002

Status

Affected

Vendor Statement

Conectiva Linux supported versions (6.0, 7.0 and 8) are not vulnerable to VU#803539 regarding glibc packages. Regarding VU#542971, these same versions of Conectiva Linux are vulnerable but not in the default installation, since /etc/nsswitch.conf ships without the dns parameter in the "networks:" line. Updated glibc packages which fix the second vulnerability, VU#542971, will be provided.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please see Conectiva Linux Announcement CLSA-2002:507 (english).

Debian Affected

Notified:  July 08, 2002 Updated: August 14, 2002

Status

Affected

Vendor Statement

Debian is vulnerable to the second vulnerability [VU#542971]:

 Debian 2.2 aka potato aka stable: glibc 2.1.3 does not contain the included patch
  Debian         woody aka testing: glibc 2.2.5 does not contain the included patch
  Debian         sid  aka unstable: glibc 2.2.5 does not contain the included patch
We are working towards an updated library. We are not vulnerable to the first vulnerability [VU#803539] as published in the CERT Advisory CA-2002-19, though.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

GNU glibc Affected

Notified:  June 28, 2002 Updated: August 01, 2002

Status

Affected

Vendor Statement

For resolving host names and addresses via DNS, Version 2.1.2 and earlier versions of the GNU C Library are vulnerable. Later versions are not vulnerable. For the less commonly used action of resolving network names and addresses via DNS as per Internet RFC 1011, Version 2.2.5 and earlier versions are vulnerable. To work around the problems, modify the file /etc/nsswitch.conf so that it contains "hosts:" and "networks:" lines that do not mention "dns". For example, you might use the following lines in your /etc/nsswitch.conf file: # This "networks:" line omits "dns" to work around a bug in glibc # 2.2.5 and earlier. networks: files nisplus # This "hosts:" line omits "dns" to work around a bug in glibc 2.1.2 # and earlier. hosts: nisplus [NOTFOUND=return] files [CERT/CC: This workaround will break network and host resolution that is not provided through some other means, such as database files (/etc/hosts, /etc/networks) or NIS. In most cases, resolution for non-local networks and hosts will be disabled.] Most GNU/Linux distributions with glibc 2.1.3 and later ship with a line like "networks: files" in /etc/nsswitch.conf and thus unless this line is changed they are not vulnerable. To fix the problem instead of working around it, we suggest upgrading to Version 2.1.3 or later, and applying the following patch, taking care to relink any statically linked applications that use the affected functions. This patch can also be found at: RCS file: /cvs/glibc/libc/resolv/nss_dns/dns-network.c,v retrieving revision 1.10 retrieving revision 1.10.2.1 diff -u -r1.10 -r1.10.2.1 --- libc/resolv/nss_dns/dns-network.c 2001/07/06 04:55:39 1.10 +++ libc/resolv/nss_dns/dns-network.c 2002/07/02 09:38:29 1.10.2.1 @@ -328,7 +328,9 @@ cp += n; *alias_pointer++ = bp; - bp += strlen (bp) + 1; + n = strlen (bp) + 1; + bp += n; + linebuflen -= n; result->n_addrtype = class == C_IN ? AF_INET : AF_UNSPEC; ++have_answer;

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

One aspect of this vulnerability that involves host name and address lookups was addressed in glibc version 2.1.3 in October 1999: [ftp://ftp.gnu.org/gnu/glibc/glibc-2.1.2-2.1.3.diff.gz] +1999-10-25 Ulrich Drepper + * resolv/gethnamaddr.c: Account bytes needed for alignment in + buflen. Patch by Olaf Kirch . @@ -424,6 +424,10 @@ getanswer(answer, anslen, qname, qtype) buflen -= nn; + /* XXX: when incrementing bp, we have to decrement + * buflen by the same amount --okir */ + buflen -= sizeof(align) - ((u_long)bp % sizeof(align)); bp += sizeof(align) - ((u_long)bp % sizeof(align)); if (bp + n >= &hostbuf[sizeof hostbuf]) { A second problem, a buffer overflow handling DNS answers for network names and addresses (VU#542971), affects current versions of glibc (2.2.5 and previous).

Guardian Digital Affected

Notified:  July 08, 2002 Updated: August 01, 2002

Status

Affected

Vendor Statement

Please see EnGarde Secure Linux Security Advisory ESA-20020724-018.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

Hewlett-Packard Company Affected

Notified:  July 08, 2002 Updated: August 01, 2002

Status

Affected

Vendor Statement

Please see Hewlett-Packard Company Security Bulletin HPSBTL0207-053.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

IBM Unknown

Notified:  July 08, 2002 Updated: August 01, 2002

Status

Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

MandrakeSoft Affected

Notified:  July 08, 2002 Updated: August 14, 2002

Status

Affected

Vendor Statement

Please see MandrakeSoft Security Advisory MDKSA-2002:050.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

Openwall Affected

Updated:  August 14, 2002

Status

Affected

Vendor Statement

No release or branch of Openwall GNU/*/Linux (Owl) is affected in default configuration as the "dns" NSS module isn't enabled for network lookups in our default /etc/nsswitch.conf file. The defect in "dns" module has been corrected in Owl-current on 2002/07/04 and that fix is included in the snapshot from 2002/07/07.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

Red Hat Inc. Affected

Notified:  July 08, 2002 Updated: August 01, 2002

Status

Affected

Vendor Statement

Please see Red Hat Security Advisory RHSA-2002:139-10.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

Sequent Unknown

Notified:  July 08, 2002 Updated: August 01, 2002

Status

Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

Slackware Affected

Updated:  August 13, 2002

Status

Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Slackware changelogs reflect patches to glibc libraries: ftp://ftp.slackware.com/pub/slackware/slackware-current/ChangeLog.txt ftp://ftp.slackware.com/pub/slackware/slackware-8.1/ChangeLog.txt Tue Jul 30 19:45:52 PDT 2002 (* Security fix *) patches/packages/glibc-2.2.5-i386-3.tgz: Patched to fix a buffer overflow in glibc's DNS resolver functions that look up network addresses. Another workaround for this problem is to edit /etc/nsswtich.conf changing: networks: files dns to: networks: files (* Security fix *) patches/packages/glibc-solibs-2.2.5-i386-3.tgz: Patched to fix a buffer overflow in glibc's DNS resolver functions that look up network addresses.

SuSE Inc. Affected

Notified:  July 08, 2002 Updated: August 01, 2002

Status

Affected

Vendor Statement

-----BEGIN PGP SIGNED MESSAGE----- SuSE Security Announcement Package: bind, glibc Announcement-ID: SuSE-SA:2002:026 Date: Tue Jul 09 2002 Affected products: 7.0, 7.1, 7.2, 7.3, 8.0 SuSE Linux Enterprise Server for S/390, SuSE Linux Database Server, SuSE eMail Server III, SuSE Linux Enterprise Server, SuSE Linux Firewall on CD Vulnerability Type: buffer overflow Severity (1-10): 3 SuSE default package: yes Cross References: CERT CA-2002-19; CVE CAN-2002-0651 Content of this advisory: 1) security vulnerability resolved: buffer overflow in dig, host, and nslookup utilities. problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds 3) standard appendix (further information) 1) problem description, brief discussion, solution, upgrade information A vulnerability has been discovered in some resolver library functions. The affected code goes back to the resolver library shipped as part of BIND4; code derived from it has been included in later BIND releases as well as the GNU libc. The bug itself is a buffer overflow that can be triggered if a DNS server sends multiple CNAME records in a DNS response. This bug has been fixed for the gethostbyXXX class of functions in GNU libc in 1999. Unfortunately, there is similar code in the getnetbyXXX functions in recent glibc implementations, and the code is enabled by default. However, these functions are used by very few applications only, such as ifconfig and ifuser, which makes exploits less likely. We will make updated glibc packages available as they have gone through our build system, but without separate announcements. Until glibc patches are available, we recommend that you disable DNS lookups of network names in nsswitch.conf. Simply replace the line containing the tag "networks:" with this line: networks: files In the unlikely event that you've configured any name to network mapping via DNS, make sure you copy this information to /etc/networks. The resolver bug is also present in the libbind library included in BIND. This library is used by utilities from the bindutil package. We are therefore providing security updates for bind8 that address this vulnerability. As communicated previously (1), the SuSE security team is not providing fixes for BIND4 anymore. The bind9 packages shipped by SuSE are not vulnerable. Please download the update package for your distribution and verify its integrity by the methods listed in section 3) of this announcement. Apply the updata packages (bindutil, bind8) package using rpm -Fvh bind*.rpm If you are running the BIND name server, you should restart the name server process by issuing rcnamed restart Our maintenance customers are being notified individually. The packages are being offered to install from the maintenance web. References: (1) http://www.suse.de/de/support/security/adv004_ssh.html 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - There is a format string bug in the "nn" news reader that can be exploited by a malicious NNTP server to execute arbitrary commands within the client user's account. We will be releasing updated packages. 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 uninstalled 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 toplevel 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 annoucements 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 cleartext 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. 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Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

Trustix Affected

Updated:  August 14, 2002

Status

Affected

Vendor Statement

Please see Trustix Secure Linux Security Advisory #2002-0061 (BIND) and #2002-0067 (glibc).

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

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