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Sicherheit: Pufferüberlauf in pptpd
Aktuelle Meldungen Distributionen
Name: Pufferüberlauf in pptpd
ID: SuSE-SA:2003:029
Distribution: SUSE
Plattformen: SUSE Linux 7.2, SUSE Linux 7.3, SUSE eMail Server III, SUSE Linux Connectivity Server, SUSE Linux Database Server, SUSE Linux Enterprise Server 7, SUSE Linux 8.0, SUSE eMail Server 3.1, SUSE Linux Office Server, SUSE Linux 8.1, SUSE Linux Enterprise Server 8, SUSE UnitedLinux 1.0, SUSE Linux 8.2
Datum: Sa, 7. Juni 2003, 13:00
Referenzen: Keine Angabe
Applikationen: pptpd

Originalnachricht

-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

SuSE Security Announcement

Package: pptpd
Announcement-ID: SuSE-SA:2003:029
Date: Fri Jun 6 16:30:00 MEST 2003
Affected products: 7.2, 7.3, 8.0, 8.1, 8.2
SuSE Linux Database Server
SuSE eMail Server III, 3.1
SuSE Linux Connectivity Server
SuSE Linux Enterprise Server 7
SuSE Linux Enterprise Server 8
SuSE Linux Office Server
UnitedLinux 1.0
Vulnerability Type: remote code execution
Severity (1-10): 5
SuSE default package: Yes
Cross References: -

Content of this advisory:
1) security vulnerability resolved: Remote code execution due to
an integer overflow.
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- snort

3) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion, solution, upgrade information

The PPTP daemon contains a remotely exploitable buffer overflow which
was introduced due to a integer overflow in the third argument passed
to the read() library call. This bug has been fixed.
Since there is no workaround other than shutting down the PPTP daemon
an update is strongly recommended if you need a PPTP server running.

To be sure the update takes effect you have to restart the PPTP daemon
by executing the following command as root:

"rcpptpd restart"

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.

i386 Intel Platform:

SuSE-8.2:
pptpd-1.1.2-418.i586.rpm
5caa610c56180b7597886cd919362fb3
patch rpm(s):
pptpd-1.1.2-418.i586.patch.rpm
d28db868016ac2ce61fd7234a47d1502
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/pptpd-1.1.2-418.src.rpm
d69f971343f9d1cb5eef5f57ce16fffa

SuSE-8.1:
pptpd-1.1.2-413.i586.rpm
be9e2f5a26fcf3f95bf9ffcc206e926c
patch rpm(s):
pptpd-1.1.2-413.i586.patch.rpm
448c505376cce08bdfa2e6b46f333db7
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/pptpd-1.1.2-413.src.rpm
067bd6274148e41b65d00e46674994a7

SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/pptpd-1.1.2-412.i386.rpm
60f1550b7f19cb9a6184dc60d43da431
patch rpm(s):
pptpd-1.1.2-412.i386.patch.rpm
870a38bd3256b196779e8e1e52cf2e5f
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/pptpd-1.1.2-412.src.rpm
78985af877c69ca16ee0ca652548aa79

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n3/pptpd-1.1.2-412.i386.rpm
598676ca6ba8fad2cc79ca722a2387c4
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/pptpd-1.1.2-412.src.rpm
c5871ca7d894338530db9fc2882744c0

SuSE-7.2:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n3/pptpd-1.1.2-411.i386.rpm
89bd9ceacaad198b9436f6fc95433f04
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/pptpd-1.1.2-411.src.rpm
96541c1e7ef7dfa6ce82ea4d3455e601


Sparc Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n3/pptpd-1.1.2-132.sparc.rpm
5a868893c50a332b46fb50efd426db44
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/pptpd-1.1.2-132.src.rpm
5654f0e078319165beee722d8250625d


PPC Power PC Platform:

SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n3/pptpd-1.1.2-262.ppc.rpm
6b8826e29930cfa077cfc6db18fd07f1
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/pptpd-1.1.2-262.src.rpm
55208931a1240ca324fbefb155976bd6


______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- snort
A overflow in the stream4 preprocessor has been fixed in the new snort
packages which will be available soon on our ftp servers.

______________________________________________________________________________

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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--
~
~ perl self.pl
~ $_='print"\$_=\47$_\47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~


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