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Sicherheit: Mehrere Probleme in hylafax
Aktuelle Meldungen Distributionen
Name: Mehrere Probleme in hylafax
ID: SuSE-SA:2002:035
Distribution: SUSE
Plattformen: 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 Linux Enterprise Server, SUSE Linux Office Server
Datum: Di, 8. Oktober 2002, 13:00
Referenzen: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1050
Applikationen: HylaFAX

Originalnachricht

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

______________________________________________________________________________

SuSE Security Announcement

Package: hylafax
Announcement-ID: SuSE-SA:2002:035
Date: Friday, Oct 4th 2002 10:30 MEST
Affected products: 7.0, 7.1, 7.2, 7.3, 8.0
SuSE Linux Connectivity Server
SuSE Linux Enterprise Server
SuSE Linux Office Server
Vulnerability Type: remote privilege escalation
Severity (1-10): 4
SuSE default package: no
Cross References: CAN-2002-1050

Content of this advisory:
1) security vulnerability resolved:
- format string bug in logging
code for TSI
- buffer overflow in faxgetty
while handling image data
2) pending vulnerabilities, solutions, workarounds:
- glibc
- ghostview/kghostview
- fetchmail
- kdelibs
- ethereal
3) standard appendix (further information)

______________________________________________________________________________

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

HylaFAX is a client-server architecture for receiving and sending
facsimiles.

The logging function of faxgetty prior version 4.1.3 was vulnerable to
a format string bug when handling the TSI value of a received facsimile.
This bug could easily be used to trigger a denial-of-service attack or
to execute arbitrary code remotely.

Another bug in faxgetty, a buffer overflow, can be abused by a remote
attacker by sending a large line of image data to execute arbitrary
commands too.

Several format string bugs in local helper applications were fixed too.
These bugs can not be exploited to gain higher privileges on a system
running SuSE Linux because of the absence of setuid bits.

The hylafax package is not installed by default.
A temporary fix is not known.

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
hylafax-4.1-285.i386.patch.rpm
3115ebdb9e65027f35809463c5e6ae7e
SuSE-8.0
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/hylafax-4.1-285.i386.rpm
07b0f2d015b0fd83c5bb9be548e7b8fb
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/hylafax-4.1-285.src.rpm
8231586e2de356c737ef3d6f9d17c0ea

SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n3/hylafax-4.1-284.i386.rpm
de51bda21cc9ee1a4dd3cd06ccccf71e
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/hylafax-4.1-284.src.rpm
aac2ecddf06934f286960f52f2e7670e

SuSE-7.2
hylafax-4.1beta2-376.i386.rpm
275c73b0b192da9c883cfebf6638604e
source rpm:
hylafax-4.1beta2-376.src.rpm
b8698144b8bb859d880659fcf01eb020

SuSE-7.1
hylafax-4.1beta2-375.i386.rpm
c322bc9007191e3692341b5702b29200
source rpm:
hylafax-4.1beta2-375.src.rpm
4d76cd426565e411941b4aaebf6ad761

SuSE-7.0
hylafax-4.1beta2-373.i386.rpm
fa7399ce161a44dbad630928cd6b3b84
source rpm:
hylafax-4.1beta2-373.src.rpm
0ac9d8b33b75f29b55a5750f17a65b93


Sparc Platform:

SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n3/hylafax-4.1-112.sparc.rpm
1cabb4113f858df010d305fa576c5a02
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/hylafax-4.1-112.src.rpm
a5ddaee97231c423e04fb71b757532a3

SuSE-7.1
hylafax-4.1beta2-218.sparc.rpm
1449e568071f5fb6080efebb8f2a7a2b
source rpm:
hylafax-4.1beta2-218.src.rpm
bf8c780206da51bc548e9fd4264b9bfc

SuSE-7.0
hylafax-4.1beta2-218.sparc.rpm
bb265465ea8b84ca31b5c954266daf1d
source rpm:
hylafax-4.1beta2-218.src.rpm
b5bcae601fe056f399fc8696aa156529


AXP Alpha Platform:

SuSE-7.1
hylafax-4.1beta2-245.alpha.rpm
45d0fd7061f10e4bef9e57c42a9b160d
source rpm:
hylafax-4.1beta2-245.src.rpm
baf364ec3636077fe8f810edeb111572

SuSE-7.0
hylafax-4.1beta2-244.alpha.rpm
856e96ce4a165b74e70ebc9ef3201672
source rpm:
hylafax-4.1beta2-244.src.rpm
f68e2260aa36d4d218a3f3589333ea0e


PPC Power PC Platform:

SuSE-7.3
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n3/hylafax-4.1-189.ppc.rpm
79846b9ae0f75f8ed9b17fed07ba6263
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/hylafax-4.1-189.src.rpm
98a123cf18cb6b34ffd9018a76ad161f

SuSE-7.1
hylafax-4.1beta2-218.ppc.rpm
2bfe866f1bd1d93307449de95d84d6c2
source rpm:
hylafax-4.1beta2-218.src.rpm
972c605bd3a9cc15bbbc5aa188dfc864

SuSE-7.0
hylafax-4.1beta2-217.ppc.rpm
00b1ae1c91235ecceb287ffe7aced175
source rpm:
hylafax-4.1beta2-217.src.rpm
e905325a032854fb653cf458e0db8942

______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- glibc
Client applications which use res_search/res_nsreach and/or res_query()/
res_nquery() of libresolv could trigger a DNS decoding error, a SEGV or
leak information by reading beyond the end of a too small
'answer'
buffer.
The update packages are being built and tested. We will publish a
security
announcement as soon as they are ready.

- ghostview/kghostview
Bufferoverflows have recently been discovered in these packages. They
allow attackers to execute arbitrary code with the privileges of the
user viewing special crafted documents created by the attacker. New
packgaes will soon be available on our ftp servers.

- fetchmail
Fetchmail contains remotely exploitable overflows in the mail header
parsing functions. In depth discussion of these problems can be found
at http://security.e-matters.de/advisories/032002.html.
New packages will soon be available on our ftp servers.

- kdelibs
KDE's SSL implementation fails to check the trust chain in SSL
certificates. This bug allows faking valid SSL certificates.
New KDE packages will be available soon to fix this and other bugs.

- ethereal
Several potential security issues have been discovered in ethereal
0.9.4. After this package is tested succesfuly it will be relased.

______________________________________________________________________________

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 thomas.asc| pgp -fka"
Key fingerprint = 51 AD B9 C7 34 FC F2 54 01 4A 1C D4 66 64 09 83
--

Cold silence has a tendency to atrophy any sense of compassion
- Maynard James Keenan



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