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Security problems have been found in the client code of the NIS (Network Information System, aka yp - yellow pages) subsytem. SuSE distributions before SuSE-6.1 came with the original ypbind program, SuSE-6.2 and later included the ypbind-mt NIS client implementation. ypbind-3.3 (the earlier version) has a format string parsing bug if it is run in debug mode, and (discovered by Olaf Kirch <okir@caldera.de>) leaks file descriptors under certain circumstances which can lead to a DoS. In addition, ypbind-3.3 may suffer from buffer overflows. ypbind-mt, the software shipped with SuSE distributions starting with SuSE-6.2, suffers from a single format string parsing bug. Some of these bugs could allow remote attackers to execute arbitrary code as root. During code audit and testing it turned out that the ypbind-3.x software in the SuSE-6.1 distribution and earlier needs a major overhaul to make it work both reliable and secure with respect to errors in the code. Basically, this is what happened when Thorsten Kukuk <kukuk@suse.de> wrote ypbind-mt from scratch in 1998. For the same reason, we are currently unable to produce a working security update package which fixes the known and yet unknown (there may be more) problems in the ypclient packages in the SuSE-6.1 distribution and older. The only efficient workaround for the SuSE-6.1 distribution and older against these bugs for an untrusted, hostile environment is to upgrade to a new distribution base (SuSE-7.0 is recommended) and use the ypclient update packages for this distribution. As of today, there is no exploit known to exist in the wild.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: ypbind/ypclient
Announcement-ID: SuSE-SA:2000:042
Date: Wednesday, October 18th, 2000 19:15 MEST
Affected SuSE versions: 6.0, 6.1, 6.2, 6.3, 6.4, 7.0
Vulnerability Type: possible remote root compromise
Severity (1-10): 8
SuSE default package: yes (starting with SuSE-6.4)
Other affected systems: Linux systems using this NIS implementation
Content of this advisory:
1) security vulnerability resolved: ypbind/ypclient
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
Security problems have been found in the client code of the NIS
(Network Information System, aka yp - yellow pages) subsytem.
SuSE distributions before SuSE-6.1 came with the original ypbind
program, SuSE-6.2 and later included the ypbind-mt NIS client
implementation. ypbind-3.3 (the earlier version) has a format
string parsing bug if it is run in debug mode, and (discovered
by Olaf Kirch <okir@caldera.de>) leaks file descriptors under
certain circumstances which can lead to a DoS. In addition,
ypbind-3.3 may suffer from buffer overflows.
ypbind-mt, the software shipped with SuSE distributions starting
with SuSE-6.2, suffers from a single format string parsing bug.
Some of these bugs could allow remote attackers to execute
arbitrary code as root.
During code audit and testing it turned out that the ypbind-3.x
software in the SuSE-6.1 distribution and earlier needs a major
overhaul to make it work both reliable and secure with respect
to errors in the code. Basically, this is what happened when
Thorsten Kukuk <kukuk@suse.de> wrote ypbind-mt from scratch in 1998.
For the same reason, we are currently unable to produce a working
security update package which fixes the known and yet unknown (there
may be more) problems in the ypclient packages in the SuSE-6.1
distribution and older.
The only efficient workaround for the SuSE-6.1 distribution and older
against these bugs for an untrusted, hostile environment is to upgrade
to a new distribution base (SuSE-7.0 is recommended) and use the
ypclient update packages for this distribution.
As of today, there is no exploit known to exist in the wild.
For SuSE-6.2 and later distributions we provide update packages as
listed below. We recommend to download and install these packages
on systems that are NIS/yp clients.
Please note that the sources for the ypclient package are contained
within the ypserv source rpm.
Download the update package from locations described below and install
the package with the command `rpm -Uhv file.rpm'. The md5sum for each
file is in the line below. You can verify the integrity of the rpm
files using the command
`rpm --checksig --nogpg file.rpm',
independently from the md5 signatures below.
i386 Intel Platform:
SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/ypclient-3.5-89.i386.rpm
76e4e7f60791db16c5e36fb5dbf60b65
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/ypserv-1.3.11-89.src.rpm
e2b1dccaec003f54e4ebbdef84d99a10
SuSE-6.4
ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/ypclient-3.4-95.i386.rpm
e485ea27264fb9c4f890cdf7605ffa30
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/ypserv-1.3.11-95.src.rpm
c61c6df2ba1fef2369406b2dcbcd25f1
SuSE-6.3
ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/ypclient-3.4-95.i386.rpm
c1a10cc0a3f72242b136be921f9ae0c1
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/ypserv-1.3.11-95.src.rpm
6f47a880d5e7175dc2b5ff0116d7de4d
SuSE-6.2
ftp://ftp.suse.com/pub/suse/i386/update/6.2/n1/ypclient-3.4-95.i386.rpm
9050e63cb9f7fac4997968760292a6f1
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.2/zq1/ypserv-1.3.11-95.src.rpm
7ecfaffd8cdb68f73adfd1d6fd27ed39
SuSE-6.1 and older:
Please see the problem description above.
Sparc Platform:
SuSE-7.0
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/ypclient-3.5-89.sparc.rpm
1a38d25c8647f010e2a9879f28de4adf
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/ypserv-1.3.11-89.src.rpm
6ba9200e49210f98ca845107b034b981
AXP Alpha Platform:
SuSE-6.4
ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/ypclient-3.4-95.alpha.rpm
6aea95ca27245eb3df72da7596af3321
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/ypserv-1.3.11-95.src.rpm
a4bf635b9ee4bdefc29b7e6e1cf0cf41
SuSE-6.3
ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/ypclient-3.4-95.alpha.rpm
b68f8690b7dc554ac9098c83f9c633cd
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/ypserv-1.3.11-95.src.rpm
ef0a026d078847d0958118bbbc46b99e
PPC Power PC Platform:
SuSE-6.4
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/ypclient-3.4-95.ppc.rpm
26080b1443a3daa1de64c876ae36e6f2
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/ypserv-1.3.11-95.src.rpm
4f0904d73c98c8b9737d5ac34b7a4dd5
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
Another security announcement is following this advisory.
______________________________________________________________________________
3) standard appendix:
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-subscribe@suse.com>.
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
<suse-security-announce-subscribe@suse.com>.
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>.
===============================================
Regards,
Roman Drahtmüller.
- - --
- -
| Roman Drahtmüller <draht@suse.de> // "Caution: Cape does |
SuSE GmbH - Security Phone: // not enable user to fly."
| Nürnberg, Germany +49-911-740530 // (Batman Costume warning label) |
- -
______________________________________________________________________________
The information in this advisory may be distributed or reproduced,
provided that the advisory is not modified in any way.
SuSE GmbH makes no warranties of any kind whatsoever with respect
to the information contained in this security advisory.
Type Bits/KeyID Date User ID
pub 2048/3D25D3D9 1999/03/06 SuSE Security Team <security@suse.de>
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