Date: Fri, 31 Oct 2003 13:38:47 +0100 (CET)
From: Thomas Biege <[email protected]>
To: [email protected]Subject: SUSE Security Announcement: thttpd (SuSE-SA:2003:044)
-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SUSE Security Announcement
Package: thttpd
Announcement-ID: SuSE-SA:2003:044
Date: Friday, Oct 31st 2003 13:04 MEST
Affected products: 7.3, 8.0, 8.1, 8.2, 9.0
Vulnerability Type: remote privilege escalation/
information leak
Severity (1-10): 5
SUSE default package: no
Cross References: CAN-2003-0899
CAN-2002-1562
Content of this advisory:
1) security vulnerability resolved:
- buffer overflow
- information leak (virtual hosting)
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds:
- libnids
- KDE
- postgresql
- frox
- sane
- ircd
- fileutils
- mc
- apache1/2
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
Two vulnerabilities were found in the "tiny" web-server thttpd.
The first bug is a buffer overflow that can be exploited remotely
to overwrite the EBP register of the stack. Due to memory-alignment of
the stack done by gcc 3.x this bug can not be exploited. All thttpd
versions mentioned in this advisory are compiled with gcc 3.x and are
therefore not exploitable.
The other bug occurs in the virtual-hosting code of thttpd. A remote
attacker can bypass the virtual-hosting mechanism to read arbitrary
files.
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/thttpd-2.23beta1-165.i586.rpm
e33f3897cac1e1fe117eff8ca252ec0f
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/thttpd-2.23beta1-165.i586.patch.rpm
cd5c2aeb6d31d6a6781f392af17a4989
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/thttpd-2.23beta1-165.src.rpm
c6e2446bc94c8c00d35b7741b67df678
SuSE-8.2:
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/thttpd-2.23beta1-164.i586.rpm
a491b55f562fa0f3b1679ee819140c72
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/thttpd-2.23beta1-164.i586.patch.rpm
bbb3dd624b19d8683223049a070d4cf2
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/thttpd-2.23beta1-164.src.rpm
2710751ff1ee8fbab3c2934c5cb09f3d
SuSE-8.1:
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/thttpd-2.23beta1-163.i586.rpm
428db4fb2eccebb5ed16cb28161ba2a5
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/thttpd-2.23beta1-163.i586.patch.rpm
b32fb0a87d8d7de3ed1953e64da89bc8
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/thttpd-2.23beta1-163.src.rpm
e64bc1488747a414f6bd60735f82385f
SuSE-8.0:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/thttpd-2.20c-98.i386.rpm
952dcca179b647afdeea02b987e3daf8
patch rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/thttpd-2.20c-98.i386.patch.rpm
e596221f34a73ba6fdd29abcecb6e211
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/thttpd-2.20c-98.src.rpm
8500be9c635d1c5c9618ecca2a09a5e7
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/thttpd-2.20b-175.i386.rpm
16ffc5238c1f57b8a1e6e02989524e82
source rpm(s):
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/thttpd-2.20b-175.src.rpm
b5c4b9c65182fcd2a326e3edad7b2dfb
PPC Power PC Platform:
SuSE-7.3:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/thttpd-2.20b-112.ppc.rpm
e7aaff82bd90c459849dd78b1cc47515
source rpm(s):
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/thttpd-2.20b-112.src.rpm
8ac31eb38063a891e37ed327a5ddbc0c
______________________________________________________________________________
2) Pending vulnerabilities in SUSE Distributions and Workarounds:
- libnids
New libnids packages were released to stop remote command execution
due to a memory corruption in the TCP reassembly code. (CAN-2003-0850)
Please download them from our FTP servers.
- 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.
- postgresql
Several buffer overflow problems were fixed in the pg_to_asci()
function of postgresql server.
New packages are available on our FTP servers.
- frox
A denial-of-service attack in frox can be trigger remotely.
The packages are currently tested and will be release as soon as
possible.
- 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.
- fileutils
A local denial-of-service attack can be triggered by abusing the -w
option of ls(1). This attack can be turned into a remote denial-of-
service by using network services, like wuftpd, that rely on the
ls(1) command installed on the system.
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 [email protected]),
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 "[email protected]" 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:
[email protected]
- general/linux/SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an email to
<[email protected]>.
[email protected]
- SUSE's announce-only mailing list.
Only SUSE's security announcements are sent to this list.
To subscribe, send an email to
<[email protected]>.
For general information or the frequently asked questions (faq)
send mail to:
<[email protected]> or
<[email protected]> respectively.
SUSE's security contact is <[email protected]> or <[email protected]>.
The <[email protected]> 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 <[email protected]>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <[email protected]>
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Bye,
Thomas
--
Thomas Biege <[email protected]>, SuSE Linux AG, 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
--
... stay with me, save and ignorant, go back to sleep...
- Maynard James Keenan
