SuSE: 'rsync' Remote command execution
Summary
______________________________________________________________________________
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
ce6d9226a8a9a5644ece29926c1f51d7
source rpm:
0e354408f232b25fe0089b97073009a3
SuSE-7.2
1ff42b8149e21644d23fe71c40a3ec5a
source rpm:
83407b4dfad94d21af60ba3e8025e6cd
SuSE-7.1
26533f97af4474b450ad43a171c5571f
source rpm:
dcd1345446871320962e91d979ddb25b
SuSE-7.0
f16f81e5a0a11ba951b6f923cbae2abd
source rpm:
cd36ce735b4ca91f92fc2f3c7603037f
SuSE-6.4
c9330c9123757f89ed94382874122c82
source rpm:
d97478d6fe9f2419b8700c52be4d888a
Sparc Platform:
SuSE-7.3
669f52233aed0766dd72788741691558
source rpm:
85ddaa9518d19f6341a68ce254668f0b
SuSE-7.1
d68ebcdba8caa16360e225fc9d28dc54
source rpm:
b9f1f43d0248b763aef46bd610233285
SuSE-7.0
50b9cefa5f4bf86fc1e20184c15fb542
source rpm:
ffbc3ff43c339cbbe12317bb98587df3
AXP Alpha Platform:
SuSE-7.1
3b602bd23179a7b6ce162d2d377394af
source rpm:
65f9d53cb48b8456466a27d9cde04339
SuSE-7.0
2056422feb3b2b53285413ca746f2f4e
source rpm:
88c3a630df0e3073a8be55b0008371a0
SuSE-6.4
18ea59b5c4d4641b62cef9c11f535ae8
source rpm:
091659d90d3e079c0f8d4518c2c42f9f
Power PC Platform:
SuSE-7.3
f5576fca06f5d22b1410aaba399e0791
source rpm:
1baeeffafe1c7dd75189cbfe704bddf0
SuSE-7.1
04102efb5a83b5190fe6b02146ec522b
source rpm:
4a21e9f5b36f6767436c6ea92f5d17e7
SuSE-7.0
897e0010ccf09c85a8c8797dc77394e1
source rpm:
7ff150ba5f39ab527aa67308154273e2
SuSE-6.4
65ac31f12bacb9284fd2286aec7beab0
source 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
References
