Author: JT Smith
SuSE: “The CORE ST Team had found an exploitable bug in all versions of wuftpd’s ftpglob() function… This bug could be exploited depending on the implementation of the dynmaic allocateable memory API (malloc(3), free(3)) in the libc library. Linux and other system are exploitable!”
______________________________________________________________________________
SuSE Security Announcement
Package: wuftpd
Announcement-ID: SuSE-SA:2001:043
Date: Wednesday, Nov. 28th, 2001 23:45 MET
Affected SuSE versions: 6.3, 6.4, 7.0, 7.1, 7.2, 7.3
Vulnerability Type: remote root compromise
Severity (1-10): 7
SuSE default package: no
Other affected systems: all liunx-like systems using wu-ftpd 2.4.x /
2.6.0 / 2.6.1
Content of this advisory:
1) security vulnerability resolved: wuftpd
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 wuftpd package as shipped with SuSE Linux distributions comes with
two versions of wuftpd: wuftpd-2.4.2, installed as /usr/sbin/wuftpd,
and wuftpd-2.6.0, installed as /usr/sbin/wuftpd-2.6.
The admin decides which version to use by the inetd/xinetd
configuration.
The CORE ST Team had found an exploitable bug in all versions of wuftpd's
ftpglob() function.
The glob function overwrites buffer bounds while matching open and closed
brackets. Due to a missing at the end of the buffer a later call to a
function that frees allocated memory will feed free(3) with userdefined
data. This bug could be exploited depending on the implementation of
the dynmaic allocateable memory API (malloc(3), free(3)) in the libc
library. Linux and other system are exploitable!
Some weeks ago, an internal source code audit of wu-ftpd 2.6.0 performed
by Thomas Biege, SuSE Security, revealed some other security related bugs
that are fixed in the new RPM packages. Additionally, code from wu-ftpd
2.6.1 were backported to version 2.6.0 to make it more stable.
A temporary fix other than using a different server implementation of
the ftp protocol is not available. We recommend to update the wuftpd
package on your system.
We thank the wuftpd team for their work on the bug, particularly because
the coordination between the vendors and the wuftpd developers lacked
the necessary discipline for the timely release of the information
about the problem.
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 -Uhv file.rpm" to apply
the update.
i386 Intel Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/wuftpd-2.6.0-344.i386.rpm
d1b549b8c2d91d66a8b35fe17a1943b3
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/wuftpd-2.6.0-344.src.rpm
9ef0e6ac850499dc0150939c62bc146f
SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/wuftpd-2.6.0-344.i386.rpm
4583443a993107b26529331fb1e6254d
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/wuftpd-2.6.0-344.src.rpm
aaee0343670feae70ccc9217a8e22211
SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/wuftpd-2.6.0-346.i386.rpm
347a030a85cb5fcbe32d3d79d382e19e
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/wuftpd-2.6.0-346.src.rpm
aa3e53641f6ce0263196e6f1cb0447c3
SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/wuftpd-2.6.0-344.i386.rpm
e34eec18ecc10f187f6aa1aa3b24b75b
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/wuftpd-2.6.0-344.src.rpm
fafc8c2bbd68dd5ca3d04228433c359a
SuSE-6.4
ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/wuftpd-2.6.0-344.i386.rpm
2354abe95b056762c7f6584449291ff2
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/wuftpd-2.6.0-344.src.rpm
507b8d484b13737c9d2b6a68fda0cc26
SuSE-6.3
ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/wuftpd-2.6.0-347.i386.rpm
9851ad02e656bba8b5e02ed2ddb46845
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/wuftpd-2.6.0-347.src.rpm
5d7c4b6824836ca28b228cc5dcfc4fd6
Sparc Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/wuftpd-2.6.0-240.sparc.rpm
2d19e4ead17396a1e28fca8745f9629d
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/wuftpd-2.6.0-240.src.rpm
bdb0b5ddd72f8563db3c8e444a0df7f5
SuSE-7.1
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/wuftpd-2.6.0-242.sparc.rpm
f6b04f284bece6bf3700facccc015ffe
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/wuftpd-2.6.0-242.src.rpm
1660547ac9a5a3b32a4070d69803cf18
SuSE-7.0
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/wuftpd-2.6.0-241.sparc.rpm
1bd905b095b9a4bb354fc190b6e54a01
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/wuftpd-2.6.0-241.src.rpm
597263eb7d0fbbf242d519d3c126a441
AXP Alpha Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/wuftpd-2.6.0-252.alpha.rpm
e608bfd2cc9e511c6eb6932c33c68789
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/wuftpd-2.6.0-252.src.rpm
34915af1ca79b27bad8bc2fd3a5cab05
SuSE-7.0
ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/wuftpd-2.6.0-251.alpha.rpm
86a7d8f60d76a053873bcc13860b0bbb
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/wuftpd-2.6.0-251.src.rpm
9674f9f1630b3107ac22d275705da76e
SuSE-6.4
ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/wuftpd-2.6.0-251.alpha.rpm
2501444a1e4241e8f6f4cdcc6fd133b0
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/wuftpd-2.6.0-251.src.rpm
34812d943900bdb902ad7edd40e1943f
SuSE-6.3
ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/wuftpd-2.6.0-250.alpha.rpm
429a49ef9d4d0865fbb443c212b8a8c7
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/wuftpd-2.6.0-250.src.rpm
76467dae0f460677ba80ec907eefca28
PPC Power PC Platform:
SuSE-7.3
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/wuftpd-2.6.0-277.ppc.rpm
a381269b3e2fc43fda59e4d08aef57ae
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/wuftpd-2.6.0-277.src.rpm
7cacb696a88e57a843402a796212aee6
SuSE-7.1
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/wuftpd-2.6.0-277.ppc.rpm
bfc39be2c09323d96f974fdd0c73fda1
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/wuftpd-2.6.0-277.src.rpm
e2681b2ed4801ce14b5dfb926480ac51
SuSE-7.0
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/wuftpd-2.6.0-279.ppc.rpm
19f989e637fd9b6fa652f8a4014bb7b1
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/wuftpd-2.6.0-279.src.rpm
76c493a915691c51a2481f0925e8ce39
SuSE-6.4
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/wuftpd-2.6.0-278.ppc.rpm
ad29cf172bbd03a5e1f301cf6b9404e5
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/wuftpd-2.6.0-278.src.rpm
82338702692eba599d8c3d242aff3d1a
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- ssh/openssh exploits
The wrong fix for the crc32-compensation attack is currently actively
exploited in the internet for both the ssh and the openssh
implementation of the ssh-1 protocol.
We urge our users to upgrade their ssh or openssh packages to the
latest versions that are located on our ftp server at the usual
directories, referred to via
http://www.suse.de/de/support/security/adv004_ssh.txt from February
earlier this year.
Please note, the packages for the SuSE Linux distributions 7.0 and
older containing cryptographic code are located on the German ftp
server ftp.suse.de, the distributions 7.1 and newer have their crypto
updates on ftp.suse.com. There are legal constraints beyond our
control that lead to this situation.
Openssh packages of the version 2.9.9p2 ready to download on the ftp
server ftp.suse.com. They fix the security problems mentioned above,
along with a set of less serious security problems.
The announcement is still pending while investigations about the
status of the package are in progress.
- libgtop_daemon
The libgtop_daemon, part of the libgtop package for gathering and
monitoring process and system information, has been found vulnerable
to a format string error. We are in the process of providing fixes for
the affected distributions 6.4-7.3. In the meanwhile, we recommend to
disable the libgtop_daemon on systems where it is running. This daemon
is neither installed nor started (if installed) by default on SuSE
Systems.
- kernel updates
A bug in the elf loader of the linux kernels version 2.4 from our
announcement SSA:2001:036 can cause a system to crash if a user
executes a vmlinux kernel image. We are preparing another update
series to workaround this problem and will re-issue the kernel
announcement as soon as possible.
______________________________________________________________________________
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>.
===============================================
______________________________________________________________________________
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.
Category:
- Linux
