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The the flexible and powerful FTP command-line client lftp is vulnerable to two remote buffer overflows. When using lftp via HTTP or HTTPS to execute commands like 'ls' or 'rels' specially prepared directories on the server can trigger a buffer overflow in the HTTP handling functions of lftp to possibly execute arbitrary code on the client-side. Please note, to exploit these bugs an attacker has to control the server- side of the context and the attacker will only gain access to the account of the user that is executing lftp.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SUSE Security Announcement
Package: lftp
Announcement-ID: SuSE-SA:2003:051
Date: Monday, Dec 15th 2003 14:30 MET
Affected products: 8.2, 9.0
remote system compromise
Severity (1-10): 3
SUSE default package: no
Cross References:
Content of this advisory:
1) security vulnerability resolved:
- local buffer overflow
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- mc
- mod_gzip
- freeradius
- tripwire
- cvs
- irssi
- atftp
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
The the flexible and powerful FTP command-line client lftp is vulnerable
to two remote buffer overflows.
When using lftp via HTTP or HTTPS to execute commands like 'ls' or 'rels'
specially prepared directories on the server can trigger a buffer overflow
in the HTTP handling functions of lftp to possibly execute arbitrary code
on the client-side.
Please note, to exploit these bugs an attacker has to control the server-
side of the context and the attacker will only gain access to the account
of the user that is executing lftp.
There is no temporary workaround known.
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.
Our maintenance customers are being notified individually. The packages
are being offered to install from the maintenance web.
Intel i386 Platform:
SuSE-9.0:
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/lftp-2.6.6-71.i586.rpm
2e5aee46868b5b19c26a8559927e8663
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/lftp-2.6.6-71.i586.patch.rpm
0468cf8f2b2b4c18a854f51ef63470b7
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/lftp-2.6.6-71.src.rpm
a32eee3ff4eeb322d44f04b9f8ff4c9c
SuSE-8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/lftp-2.6.4-44.i586.rpm
df0d7c059cd3bb4fe47c927849fd9a5e
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/lftp-2.6.4-44.i586.patch.rpm
eb9d6aedc25d3e2d25b63999526ee1bd
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/lftp-2.6.4-44.src.rpm
63695b02bf520b02f93ec73078d6e4d8
______________________________________________________________________________
2) Pending vulnerabilities in SUSE Distributions and Workarounds:
- mc
By using a special combination of links in archive-files it is possible
to execute arbitrary commands while mc tries to open it in its VFS.
The packages are currently tested and will be release as soon as
possible.
- mod_gzip
The apache module mod_gzip is vulnerable to remote code execution
while running in debug-mode. We do not ship this module in debug-mode
but future versions will include the fix.
Additionally the mod_gzip code was audited to fix more possible security
related bugs.
- freeradius
Two vulnerabilities were found in the FreeRADIUS package.
The remote denial-of-service attack bug was fixed and new packages
will be released as soon as testing was successfully finished.
The other bug is a remote buffer overflow in the module rlm_smb.
We do not ship this module and will fix it for future releases.
- tripwire
Tripwire is a file integrity checker. The tripwire version on SuSE Linux
8.2 and 9.0 do crash when a requested file does not exists.
New packages will be available soon.
- cvs
The cvs server-side can be tricked to create files in the root filesystem
of the server by requesting malformed modules. The permissions on the
root filesystem normally prevent this malfunction.
New packages will be available soon.
- irssi
Under special circumstances the the irc-client irssi can be crashed
remotely by other irc-clients.
A fix will be available soon.
- atftp
A buffer overflow vulnerability discovered by Rick Patel has been
fixed in the atftpd (trivial file transfer protocol, UDP oriented)
daemon, contained in the atftp package. Update packages for the
affected SUSE Linux distributions 8.1 and 8.2 have been published on
our ftp server today.
We explicitly thank Dirk Mueller, KDE developer, for notifying SUSE
Security about the pending treatment of this incident.
______________________________________________________________________________
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 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-subscribe@suse.com>.
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
<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 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 <security@suse.de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>
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Bye,
Thomas
--
Thomas Biege <thomas@suse.de>, SUSE LINUX AG, Security Support & Auditing
--
# If you have the "driftnet" program installed, webcollage can display a
# collage of images sniffed off your local ethernet, instead of pulled out
# of search engines: in that way, your screensaver can display the images
# that your co-workers are downloading!
-- xscreensaver source-code
--
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: Mon Dec 15 2003 - 14:38:38 CET
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