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The well known and widely used MTA sendmail is vulnerable to a remote denial-of-service attack in version 8.12.8 and earlier (but not before 8.12). The bug exists in the DNS map code. This feature is enabled by specifying FEATURE(`enhdnsbl'). When sendmail receives an invalid DNS response it tries to call free(3) on random data which results in a process crash.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: sendmail
Announcement-ID: SuSE-SA:2003:035
Date: Tuesday, Aug 26th 2003 19:00 MEST
Affected products: 8.0, 8.1, 8.2
SuSE Linux Enterprise Server 8
remote denial-of-service
Severity (1-10): 5
SuSE default package: no
Cross References: CAN-2003-0688
Content of this advisory:
1) security vulnerability resolved: calling free() with arbitrary
argument
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- traceroute(-nanog)
- gdm2
- pam_smb
- exim
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
The well known and widely used MTA sendmail is vulnerable to a
remote denial-of-service attack in version 8.12.8 and earlier (but not
before 8.12). The bug exists in the DNS map code. This feature is
enabled by specifying FEATURE(`enhdnsbl').
When sendmail receives an invalid DNS response it tries to call free(3)
on random data which results in a process crash.
After your system was updated you have to restart your sendmail daemon
to make the update effective.
There is no known workaround for this vulnerability other than using a
different MTA.
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-8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/sendmail-8.12.7-73.i586.rpm
eaf90e49886f496b2779107f1d9a831a
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/sendmail-8.12.7-73.i586.patch.rpm
c5999fe4026e05c4308249a7e3dbf8f4
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/sendmail-8.12.7-73.src.rpm
2cda6c535a3be4e26c50373bd078b4c7
SuSE-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-8.12.6-147.i586.rpm
03d2b6e1083f863dc19a28f44256b071
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-8.12.6-147.i586.patch.rpm
ee6a3553396432bd3a208d355dacdd33
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/sendmail-8.12.6-147.src.rpm
97417cee623251c6cc3009c13c5b1fbe
SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/sendmail-8.12.3-76.i386.rpm
c7cd791bdbcf0c5ed80cd9aab0ccc965
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/sendmail-8.12.3-76.i386.patch.rpm
a2d04f73894a09b9134f0f516c385d78
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sendmail-8.12.3-76.src.rpm
4c059b5714ba2dbe5860654622b65bfb
Intel i386 Platform:
SuSE-8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/uucp-1.06.1-931.i586.rpm
1d5e50aea21f2ce88277fd9113dfb6da
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/uucp-1.06.1-931.i586.patch.rpm
402cff9f2e0e4b56b2409082d0adbc0d
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/sendmail-8.12.7-73.src.rpm
2cda6c535a3be4e26c50373bd078b4c7
SuSE-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/uucp-1.06.1-931.i586.rpm
7de06e8f16800359e25b5d9dcc739af5
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/uucp-1.06.1-931.i586.patch.rpm
67c84d8cd4ff132ef0c1a91ed845b5d8
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/sendmail-8.12.6-147.src.rpm
97417cee623251c6cc3009c13c5b1fbe
SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/uucp-1.06.1-931.i386.rpm
b95b64d0c474ee7b37a82e2fc04e72b7
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/uucp-1.06.1-931.i386.patch.rpm
e872341553634848bb19b0d89a1e3a37
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sendmail-8.12.3-76.src.rpm
4c059b5714ba2dbe5860654622b65bfb
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
- traceroute(-nanog)
A integer overflow in traceroute can be abused by local attackers
to gain access to a raw IP socket.
New packages are available on out FTP servers.
- gdm2
Due to a bug in GDM it is possible for local users to read any text
file on a system by creating a symlink from ~/.xsession-errors.
Updated packages will be available on our FTP servers soon.
- pam_smb
A buffer overflow in the password handling function of pam_smb
allows remote root compromise.
Fixed packages will be available soon.
- exim
Two bugs where fixed in exim. One bug allows remote access as user
mail/mail and the other one allows local root access for 'Admin Users'.
Fixed packages are available 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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Bye,
Thomas
--
Thomas Biege <thomas@suse.de>
SuSE Linux AG,Deutschherrnstr. 15-19,90429 Nuernberg
Function: Security Support & Auditing
"lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka"
Key fingerprint = 51 AD B9 C7 34 FC F2 54 01 4A 1C D4 66 64 09 83
--
finding beauty in the dissonance
- Maynard James Keenan
--
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: Tue Aug 26 2003 - 19:12:16 CEST
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