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Sicherheit: Pufferüberlauf in sudo
Aktuelle Meldungen Distributionen
Name: Pufferüberlauf in sudo
ID: SuSE-SA:2002:014
Distribution: SUSE
Plattformen: SUSE Linux 6.4, SUSE Linux 7.0, SUSE Linux 7.1, SUSE Linux 7.2, SUSE Linux 7.3, SUSE Linux Connectivity Server, SUSE Linux 8.0, SUSE Firewall Adminhost VPN, SUSE Linux Admin-CD for Firewall, SUSE Linux Enterprise Server
Datum: Mi, 1. Mai 2002, 13:00
Referenzen: Keine Angabe
Applikationen: sudo

Originalnachricht

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

______________________________________________________________________________

SuSE Security Announcement

Package: sudo
Announcement-ID: SuSE-SA:2002:014
Date: Tue Apr 30 16:00:00 MEST 2002
Affected products: 6.4, 7.0, 7.1, 7.2, 7.3, 8.0,
SuSE Firewall Adminhost VPN,
SuSE Linux Admin-CD for Firewall,
SuSE Linux Enterprise Server,
SuSE Linux Connectivity Server
Vulnerability Type: local privilege escalation
Severity (1-10): 6
SuSE default package: yes
Other affected systems: All systems with sudo installed.

Content of this advisory:
1) security vulnerability resolved: Heap overflow in sudo.
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 sudo program allows local users to execute certain configured
commands with root priviledges. Sudo contains a heap overflow in its
prompt assembling function. The input used to create the password prompt
is user controlled and not properly length-checked before copied to certain
heap locations. This allows local attackers to overflow the heap of sudo,
thus executing arbitrary commands as root.
We would like to thank GlobalInterSec for finding and researching
this vulnerability.
As a temporary workaround you may remove the setuid bit from sudo by
issuing the following command as root: "chmod -s /usr/bin/sudo".

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-8.0
ftp://ftp.suse.com/pub/suse/i386/update/8.0/ap1/sudo-1.6.5p2-79.i386.rpm
b54f68ff4b32f9d920f2f1ff887d1ddc
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sudo-1.6.5p2-79.src.rpm
fd1ccf6fe52c6b999c5ed24a2f3a4e65

SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/ap1/sudo-1.6.3p7-83.i386.rpm
80edbf5caf02c519cf2c01d6ba76d22f
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sudo-1.6.3p7-83.src.rpm
77962932840740ce5e3dfe57a887592d

SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/ap1/sudo-1.6.3p6-92.i386.rpm
669aa8db134e39f462cb9f2648f6735f
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sudo-1.6.3p6-92.src.rpm
249b1ef0135dcfede3648982900e277c

SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/ap1/sudo-1.6.3p6-91.i386.rpm
6b3b84f0a4c687e91da179937b87048a
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sudo-1.6.3p6-91.src.rpm
bf59a6b200a0fb130f3528ce23698be0

SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/ap1/sudo-1.6.3p6-90.i386.rpm
5b67ef9fed383242111953d942c62174
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/sudo-1.6.3p6-90.src.rpm
c35f6390b360500b7b649e4590a748cc

SuSE-6.4
ftp://ftp.suse.com/pub/suse/i386/update/6.4/ap1/sudo-1.5.9p1-87.i386.rpm
82d98116eccc73c7a0ce03a51e9b5378
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/sudo-1.5.9p1-87.src.rpm
e75e2608036a963a7339fe4632a2550b

Sparc Platform:

SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/ap1/sudo-1.6.3p7-33.sparc.rpm
bd492b6d601ceb30486e3e970a2211a3
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sudo-1.6.3p7-33.src.rpm
d2435d180cdd76647e1f1416e93c2420

SuSE-7.1
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/ap1/sudo-1.6.3p6-37.sparc.rpm
bbad36265f93fac25d59f8c26b1ccd52
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/sudo-1.6.3p6-37.src.rpm
a328d2eb0fdc816341a68febfeb5a33a

SuSE-7.0
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/ap1/sudo-1.6.3p6-36.sparc.rpm
48e7b360b45bae0b3e9e90b3bf945f75
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/sudo-1.6.3p6-36.src.rpm
bd8f11a8916340e0d243ae1cc647df26

AXP Alpha Platform:

SuSE-7.1
ftp://ftp.suse.com/pub/suse/axp/update/7.1/ap1/sudo-1.6.3p6-40.alpha.rpm
4505dd58fe309ef0a4515db6a6980ec4
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sudo-1.6.3p6-40.src.rpm
85dfbe40da4d93d54d3c16f6489a7f32

SuSE-7.0
ftp://ftp.suse.com/pub/suse/axp/update/7.0/ap1/sudo-1.6.3p6-40.alpha.rpm
b67858459774e5e04c9c22e84d5899ff
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/sudo-1.6.3p6-40.src.rpm
6d0537068d16785bfdbca936c6395abb

PPC Power PC Platform:

SuSE-7.3
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/ap1/sudo-1.6.3p7-65.ppc.rpm
1734f578b1fa87c26e51a11e3dc90d18
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sudo-1.6.3p7-65.src.rpm
ebff8b3e7b86ef9bb69fb13da37903ce

SuSE-7.1
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/ap1/sudo-1.6.3p6-45.ppc.rpm
4318adbde184c1c8fff6eb581f02c11e
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sudo-1.6.3p6-45.src.rpm
771f9e7f6d1fc1ba4df119147e48ddcd

SuSE-7.0
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/ap1/sudo-1.6.3p6-45.ppc.rpm
6ae150cfa793f20e49ed751aa686fdea
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/sudo-1.6.3p6-45.src.rpm
ede5fedf45ffe6b59c43e082fcef50f4

SuSE-6.4
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/ap1/sudo-1.5.9p1-85.ppc.rpm
0677a205615f631a41ca308be03db7bd
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/sudo-1.5.9p1-85.src.rpm
71da4a7d43043b20eefd5e05048616d8



______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- ifup-dhcp could be tricked into executing arbitrary
commands as root by DHCP servers handing out illegal values (e.g.
containing spaces), because it sourced dhcpcd's info file, where
not all variable values are quoted. This problem has been fixed.

______________________________________________________________________________

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 uninstalled 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 toplevel 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 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> 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 cleartext signature shows proof of the
authenticity of the text.
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 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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