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Hylafax is an Open Source fax server which allows sharing of fax equipment among computers by offering its service to clients by a protocol similar to http://FTP. The SuSE Security Team found a format bug condition during a code review of the hfaxd server. It allows remote attackers to execute arbitrary code as root. However, the bug can not be triggered in hylafax' default configuration.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SUSE Security Announcement
Package: hylafax
Announcement-ID: SuSE-SA:2003:045
Date: Mon Nov 10 15:00:00 CET 2003
Affected products: 7.3, 8.0, 8.1, 8.2, 9.0
SuSE Linux Enterprise Server 7
SuSE Linux Standard Server 8
SuSE Linux Desktop 1.0
SuSE Linux Office Server
Vulnerability Type: remote code execution
Severity (1-10): 5
SUSE default package: No
Cross References: CAN-2003-0886
http://www.hylafax.org
Content of this advisory:
1) security vulnerability resolved: Format bug condition in hfaxd.
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- ethereal
- KDE
- sane
- ircd
- mc
- apache1/2
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
Hylafax is an Open Source fax server which allows sharing of fax
equipment among computers by offering its service to clients by
a protocol similar to http://FTP.
The SuSE Security Team found a format bug condition during a code
review of the hfaxd server. It allows remote attackers to execute
arbitrary code as root. However, the bug can not be triggered in
hylafax' default configuration.
The "capi4hylafax" packages also need to be updated as a dependency
where they are available.
After the update has been successfully applied the hfaxd server has
to be restarted by issuing the following command as root:
/etc/rc.d/hylafax 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.
Intel i386 Platform:
SuSE-9.0:
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/hylafax-4.1.7-67.i586.rpm
598081f0d8518014c122466549d3aee2
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/capi4hylafax-4.1.7-67.i586.rpm
b440a0ac3debb15af86c55ce9648a0c9
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/hylafax-4.1.7-67.i586.patch.rpm
b133d6a01100c51769edfe73842f21e5
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/capi4hylafax-4.1.7-67.i586.patch.rpm
48b02652d3efd052a99fe45346a40533
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/hylafax-4.1.7-67.src.rpm
44b246480b629ee9659ff2360999f4be
SuSE-8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/hylafax-4.1.5-190.i586.rpm
a17a36e3d9779aaddc074e634c1d16c2
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/capi4hylafax-4.1.5-190.i586.rpm
f016a370c9428aaca1a4393e3fb1fa6c
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/hylafax-4.1.5-190.i586.patch.rpm
f9be5873c7f8abaae23494f98463b451
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/capi4hylafax-4.1.5-190.i586.patch.rpm
715001c063280b3ff8c3ec9c918776b9
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/hylafax-4.1.5-190.src.rpm
cdf6cf2e9ad8e9f96a0a76ba03921c5a
SuSE-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/hylafax-4.1.3-145.i586.rpm
85ffa634af490894d049c2c350bd5637
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/capi4hylafax-4.1.3-145.i586.rpm
c3766b389e79820e88375127ce47246f
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/hylafax-4.1.3-145.i586.patch.rpm
f6afb37c81542e75da229db6cd1f9571
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/capi4hylafax-4.1.3-145.i586.patch.rpm
e3f1e42ab4a12d056ad440e4607214c9
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/hylafax-4.1.3-145.src.rpm
6babcf169ecf60cbfc83a3f8575cdf3e
SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/hylafax-4.1-303.i386.rpm
e4492b144902043a38bfd71dbb683b23
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/hylafax-4.1-303.i386.patch.rpm
02f80c2b8b28d176bbba8a6dccda4dce
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/hylafax-4.1-303.src.rpm
c79d4be78cca347d5ecded4c6029f2b2
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n3/hylafax-4.1-303.i386.rpm
b42d4ff0c43cec7e09fe4c1bbf5c8226
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/hylafax-4.1-303.src.rpm
8bdce70f21a0362882947a1d4de760ae
Sparc Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n3/hylafax-4.1-122.sparc.rpm
fa187f99f0a25df1815445dbbb6a0abe
source rpm(s):
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/hylafax-4.1-122.src.rpm
227353e1b80121f3ccfabc7fb888a485
PPC Power PC Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n3/hylafax-4.1-206.ppc.rpm
4388fa7fe1aa5173e3d33bdf1c477349
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/hylafax-4.1-206.src.rpm
a95fd798a47396a077d7690a3e62986b
______________________________________________________________________________
2) Pending vulnerabilities in SUSE Distributions and Workarounds:
- ethereal
A new official version of ethereal, a network traffic analyzer, was
released to fix various security-related problems.
An update package is currently being tested and will be released
as soon as possible.
- KDE
New KDE packages are currently being tested. These packages fixes
several vulnerabilities:
+ remote root compromise (CAN-2003-0690)
+ weak cookies (CAN-2003-0692)
+ SSL man-in-the-middle attack
+ information leak through HTML-referrer (CAN-2003-0459)
The packages will be release as soon as testing is finished.
- sane
The scanner service sane of SuSE Linux 7.3-8.1 is vulnerable to
a remote denial-of-service attack. This attack can even be triggered
if the attackers host is not listed in the saned.conf file.
The packages are currently tested and will be release as soon as
possible.
- ircd
The Internet Relay Chat daemon is vulnerable to a remote denial-of-
service attack. The attack can be triggered by irc clients directly
connected to the daemon.
The packages are currently tested and will be release as soon as
possible.
- mc
By using a special combination of links in archive-files it is possible
to execute arbitrary commands while mc tries to open it in its VFS.
The packages are currently tested and will be release as soon as
possible.
- apache1/2
The widely used HTTP server apache has several security vulnerabilities:
- locally exploitable buffer overflow in the regular expression code.
The attacker must be able to modify .htaccess or httpd.conf.
(affects: mod_alias and mod_rewrite)
- under some circumstances mod_cgid will output its data to the
wrong client (affects: apache2)
______________________________________________________________________________
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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: Mon Nov 10 2003 - 15:49:45 CET
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