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xntp is the network time protocol package widely used with many unix and linux systems for system time synchronization over a network. An exploit published by Przemyslaw Frasunek demonstrates a buffer overflow in the control request parsing code. The exploit allows a remote attacker to execute arbitrary commands as root. All versions as shipped with SuSE Linux are affected by the buffer overflow problem.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: xntp
Announcement-ID: SuSE-SA:2001:10
Date: Monday, April 9th 22:30 MEST
Affected SuSE versions: (6.0, 6.1, 6.2), 6.3, 6.4, 7.0, 7.1
Vulnerability Type: remote root compromise
Severity (1-10): 8
SuSE default package: no
Other affected systems: systems using xntp in newer versions
Content of this advisory:
1) security vulnerability resolved: xntp
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
xntp is the network time protocol package widely used with many unix
and linux systems for system time synchronization over a network.
An exploit published by Przemyslaw Frasunek demonstrates a buffer
overflow in the control request parsing code. The exploit allows a
remote attacker to execute arbitrary commands as root. All versions as
shipped with SuSE Linux are affected by the buffer overflow problem.
A temporary workaround is to kill the daemon and to set the variable
START_XNTPD in the file /etc/rc.config to "no" so that the daemon
will not be started again upon reboot of the system. Correct the system
time manually if necessary or adjust the time by running ntpdate from
a cron job on a regular basis.
We believe that this problem is generally underestimated since the
xntpd daemon tends to get forgotten over the years of a system's life-
time once installed and configured. The xntpd daemon is not started by
default in SuSE Linux distributions. We strongly recommend to immediately
update the xntp package on each system where the daemon is installed,
configured and running.
Note:
The xntp update packages for most distributions have been available
for download since Friday last week. The packages for all 6.4 and 7.0
version distributions had to be rebuilt due to a specfile bug that
did not show up earlier and that caused a delay in building packages.
This bug causes the rpm subsystem to complain about the release number
of the package. Now that this bug is corrected, you might find yourself
having installed a package where there is a newer version of the package
on the ftp server. However, regardless of the package release number,
all published packages fix the currently known security problems in the
xntpd network time daemon.
Note:
The source rpm of xntp in newer distributions generates two packages:
xntp.rpm and xntpdoc.rpm. It is not necessary to update the xntpdoc
package which is why we do not provide the update packages on our ftp
server. The xntpdoc package only contains the documentation for the
xntp package and did not change in this updated package.
Download the update package from locations desribed 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.
SPECIAL INSTALL INSTRUCTIONS:
==============================
The xntpd daemon must be restarted for the new package to become
active after the installation of the update rpm. You can do this
by running the command
kill -15 `pidof xntpd`
as root. After performing the upgrade using the rpm command above,
you can restart the xntpd:
rcxntpd start
You should now see the new daemon synchronizing in your syslogs,
depending on where you configured the daemon to write its logs to.
i386 Intel Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/xntp-4.0.99f-34.i386.rpm
9e39ca8f7b01fef22766463b8295e25d
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/xntp-4.0.99f-34.src.rpm
dfa51b46c92b917353f52e5d83863478
SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/xntp-4.0.99f-37.i386.rpm
4293ad8a3e084ec5d773bbcab8380c08
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/xntp-4.0.99f-37.src.rpm
745b894dcb6a97caa36f97858a51e279
SuSE-6.4
ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/xntp-4.0.99f-38.i386.rpm
8001ac19d0ee812be82b6b066b4313d5
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/xntp-4.0.99f-38.src.rpm
7d56618cba3d768aa53246f39158987d
SuSE-6.3
ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/xntp-4.0.98d-1.i386.rpm
2f5d7b43b167c6acf13f68b13b1b7989
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/xntp-4.0.98d-1.src.rpm
11182e5e8c3769e6f9498ade9fcbe1fc
SuSE-6.2 (unsupported platform)
ftp://ftp.suse.com/pub/suse/i386/update/6.2/n1/xntp-4.0.93a-18.i386.rpm
5b55d179e3d4a0c57513bed03013c1a9
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.2/zq1/xntp-4.0.93a-18.src.rpm
dbb7c833ddc25b0bde406b4319d4106f
SuSE-6.1 (unsupported platform)
ftp://ftp.suse.com/pub/suse/i386/update/6.1/n1/xntp-4.0.92c-1.i386.rpm
baa93b55a4eaa486968fa6285f04c865
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.1/zq1/xntp-4.0.92c-1.src.rpm
06f0174e8934e3ce6f419284564a7c91
Sparc Platform:
SuSE-7.1
The xntp packages for the SuSE-7.1 sparc distribution are currently
pending for being built. They will be available on the ftp server
as soon as they are built. The packages are gpg-signed using the key
<build@suse.de> that should have been installed on your system upon
system installation/upgrade. Use the command `rpm --checksig xntp.rpm´
to verify this signature once the packages are available for download.
In the meanwhile, please use the temporary workaround as described above.
SuSE-7.0
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/xntp-4.0.99f-19.sparc.rpm
bea9ea6a88ae68f27962d1b9ad866eac
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/xntp-4.0.99f-19.src.rpm
83243db2982126e1a6ba371ef6dcf59b
AXP Alpha Platform:
SuSE-7.0
ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/xntp-4.0.99f-22.alpha.rpm
e410a96c44f12ba3d51a4f1f3e056fcd
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/xntp-4.0.99f-22.src.rpm
61ed8e66753868735cd14e94cb295718
SuSE-6.4
ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/xntp-4.0.99f-22.alpha.rpm
9460bd3eaf5500c0184d9394b8b86627
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/xntp-4.0.99f-22.src.rpm
5c62ef99f064b687047087562cfe54ca
SuSE-6.3
ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/xntp-4.0.98d-1.alpha.rpm
ad8c8494f0aaa06a1690e4edcaa43904
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/xntp-4.0.98d-1.src.rpm
743fe2aba27f1801ac5b14cff2f2edb6
SuSE-6.1 (unsupported platform)
ftp://ftp.suse.com/pub/suse/axp/update/6.1/n1/xntp-4.0.92c-40.alpha.rpm
d400eeecb9bd0b4347f3fe58f7f90fee
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.1/zq1/xntp-4.0.92c-40.src.rpm
e2d01c31542ebbf8c740b820a6372ad1
PPC Power PC Platform:
SuSE-7.1
The xntp packages for the SuSE-7.1 ppc distribution are currently
pending for being built. They will be available on the ftp server
as soon as they are built. The packages are gpg-signed using the key
<build@suse.de> that should have been installed on your system upon
system installation/upgrade. Use the command `rpm --checksig xntp.rpm´
to verify this signature once the packages are available for download.
In the meanwhile, please use the temporary workaround as described above.
SuSE-7.0
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/xntp-4.0.99f-21.ppc.rpm
2d82e8f63df84cb409df7659437c1177
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/xntp-4.0.99f-21.src.rpm
a0bce6c36cf30da1aa587e03103a01f6
SuSE-6.4
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/xntp-4.0.99f-21.ppc.rpm
fe9082268bdf53dddcaad075284f899b
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/xntp-4.0.99f-21.src.rpm
1940b97593e3e134487d294a721e350d
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- kernel
Please expect security updates of the Linux kernel soon. To resolve all
currently known security problems in the Linux kernel, update the kernel
manually to version 2.2.19 or wait until the SuSE update rpm packages
for the supported distributions 6.3, 6.4, 7.0 and 7.1 are ready to be
used and available for download.
- more updates
In addition to the kernel update, please expect more packages to see
security updates. Currently, this involves vim, mc and sudo.
- bind8
The update packages for the 7.0 sparc distribution is available.
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/bind8-8.2.3-39.sparc.rpm
c7e2a95bd4b90d03207ffc3a9880c36c
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/bind8-8.2.3-39.src.rpm
5d4d4b608f2a8a3e61f7dc6917254f4f
The SuSE-7.1 sparc distribution was published after the bugs in bind8
were corrected.
______________________________________________________________________________
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.
Type Bits/KeyID Date User ID
pub 2048/3D25D3D9 1999/03/06 SuSE Security Team <security@suse.de>
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