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The rsync program allows users and administrators to synchronize files and whole directory structures on different machines. It is common practise to allow remote users to mirror ftp servers via anonymous rsync access. There exist several signedness bugs within the rsync program which allow remote attackers to write 0-bytes to almost arbitrary stack-locations, therefore being able to control the programflow and obtaining a shell remotely. These bugs have been fixed.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: rsync
Announcement-ID: SuSE-SA:2002:004
Date: Fri Jan 25 17:00:00 CET 2002
Affected SuSE versions: 6.4, 7.0, 7.1, 7.2, 7.3
Vulnerability Type: remote command executionn
Severity (1-10): 7
SuSE default package: no
Other affected systems: All systems with vulnerable rsync.
Content of this advisory:
1) security vulnerability resolved: rsync negative array indexing
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
The rsync program allows users and administrators to synchronize files and
whole directory structures on different machines. It is common practise
to allow remote users to mirror ftp servers via anonymous rsync access.
There exist several signedness bugs within the rsync program which allow
remote attackers to write 0-bytes to almost arbitrary stack-locations,
therefore being able to control the programflow and obtaining a shell
remotely. These bugs have been fixed.
It is recommended (also stated in the rsync documentation) to use the
"use chroot" option in rsyncd's configuration file (/etc/rsyncd.conf)
to limit the impact of a possible attack. Since this workaround does
not completely solve the security problem, we recommend to update the
package as described below.
We want to express our gratitude to Andrew Tridgell and Martin Pool,
the rsync authors and maintainers, for their excellent cooperation in
this matter.
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.
To be sure that the update takes effect, kill any existing instances of
the rsync-program.
In case you run rsync via the inetd superserver, you do not need to
restart any of your services. Inetd will automatically use the new binary.
If you used run your rsync-service with the "rsync --daemon" command,
restart your rsync with "rync --daemon" again, this time using the new
binary.
i386 Intel Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/rsync-2.4.6-288.i386.rpm
ce6d9226a8a9a5644ece29926c1f51d7
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/rsync-2.4.6-288.src.rpm
0e354408f232b25fe0089b97073009a3
SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/rsync-2.4.6-289.i386.rpm
1ff42b8149e21644d23fe71c40a3ec5a
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/rsync-2.4.6-289.src.rpm
83407b4dfad94d21af60ba3e8025e6cd
SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/rsync-2.4.6-288.i386.rpm
26533f97af4474b450ad43a171c5571f
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/rsync-2.4.6-288.src.rpm
dcd1345446871320962e91d979ddb25b
SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/rsync-2.3.2-124.i386.rpm
f16f81e5a0a11ba951b6f923cbae2abd
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/rsync-2.3.2-124.src.rpm
cd36ce735b4ca91f92fc2f3c7603037f
SuSE-6.4
ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/rsync-2.3.2-123.i386.rpm
c9330c9123757f89ed94382874122c82
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/rsync-2.3.2-123.src.rpm
d97478d6fe9f2419b8700c52be4d888a
Sparc Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/rsync-2.4.6-135.sparc.rpm
669f52233aed0766dd72788741691558
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/rsync-2.4.6-135.src.rpm
85ddaa9518d19f6341a68ce254668f0b
SuSE-7.1
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/rsync-2.4.6-135.sparc.rpm
d68ebcdba8caa16360e225fc9d28dc54
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/rsync-2.4.6-135.src.rpm
b9f1f43d0248b763aef46bd610233285
SuSE-7.0
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/rsync-2.3.2-5.sparc.rpm
50b9cefa5f4bf86fc1e20184c15fb542
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/rsync-2.3.2-5.src.rpm
ffbc3ff43c339cbbe12317bb98587df3
AXP Alpha Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/rsync-2.4.6-123.alpha.rpm
3b602bd23179a7b6ce162d2d377394af
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/rsync-2.4.6-123.src.rpm
65f9d53cb48b8456466a27d9cde04339
SuSE-7.0
ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/rsync-2.3.2-30.alpha.rpm
2056422feb3b2b53285413ca746f2f4e
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/rsync-2.3.2-30.src.rpm
88c3a630df0e3073a8be55b0008371a0
SuSE-6.4
ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/rsync-2.3.2-31.alpha.rpm
18ea59b5c4d4641b62cef9c11f535ae8
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/rsync-2.3.2-31.src.rpm
091659d90d3e079c0f8d4518c2c42f9f
Power PC Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/rsync-2.4.6-150.ppc.rpm
f5576fca06f5d22b1410aaba399e0791
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/rsync-2.4.6-150.src.rpm
1baeeffafe1c7dd75189cbfe704bddf0
SuSE-7.1
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/rsync-2.4.6-151.ppc.rpm
04102efb5a83b5190fe6b02146ec522b
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/rsync-2.4.6-151.src.rpm
4a21e9f5b36f6767436c6ea92f5d17e7
SuSE-7.0
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/rsync-2.3.2-133.ppc.rpm
897e0010ccf09c85a8c8797dc77394e1
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/rsync-2.3.2-133.src.rpm
7ff150ba5f39ab527aa67308154273e2
SuSE-6.4
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/rsync-2.3.2-133.ppc.rpm
65ac31f12bacb9284fd2286aec7beab0
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/rsync-2.3.2-133.src.rpm
4b43552a939f080a3e93fe65a88bd139
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- pine
The popular mail client "pine" was found vulnerable to an attack where
shell metacharacters inside an URL could be used to execute arbitrary
commands if pine passes the URL to an external viewer on the
commandline. The pine packages on SuSE products are not vulnerable to
this weakness because they contain a patch that works around this
problem since it is not new.
- xchat
We are working on updates for the xchat packages in the SuSE Linux
7.0 and 7.1 distributions that are vulnerable to an encoding bug
while receiving and decoding ctcp datagrams. This bug can lead
an xchat IRC client to execute IRC protocol specific commands to an
IRC server such as channel mode changes.
______________________________________________________________________________
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 <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.
2) 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 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-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> 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 cleartext signature shows proof of the
authenticity of the text.
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 2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>
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--
~
~ perl self.pl
~ $_='print"$_=47$_47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~
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