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Sdbsearch.cgi is Perl script which is part of the sdb package of SuSE Linux was found vulnerable by using untrustworthy client input (HTTP_REFERER). By exploiting this trust an attacker could force the sdbsearch.cgi script to open a malicious keylist file which includes keywords and filenames. By replacing the filename in the keylist file with the Perl pipe followed by arbitrary shell commands the sdbsearch.cgi would execute these commands when trying to open these 'filenames'. Note, that the attacker needs local access to the machine to store the keylist file on the server running sdbsearch.cgi. Misconfigured ftp accounts, trojan tar balls or RPM files could also be used.
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-----BEGIN PGP SIGNED MESSAGE-----
______________________________________________________________________________
SuSE Security Announcement
Package: sdb
Announcement-ID: SuSE-SA:2001:027
Date: Monday, August 20th 2001 10:00 MEST
Affected SuSE versions: [6.0, 6.1, 6.2,] 6.3, 6.4, 7.0, 7.1, 7.2
Vulnerability Type: local (maybe remote) privilege escalation
Severity (1-10): 4
SuSE default package: yes
Other affected systems: no
Content of this advisory:
1) security vulnerability resolved: sdbsearch.cgi
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
Sdbsearch.cgi is Perl script which is part of the sdb package of SuSE Linux
was found vulnerable by using untrustworthy client input (HTTP_REFERER).
By exploiting this trust an attacker could force the sdbsearch.cgi script
to open a malicious keylist file which includes keywords and filenames.
By replacing the filename in the keylist file with the Perl pipe followed
by arbitrary shell commands the sdbsearch.cgi would execute these commands
when trying to open these 'filenames'.
Note, that the attacker needs local access to the machine to store the
keylist file on the server running sdbsearch.cgi. Misconfigured ftp
accounts, trojan tar balls or RPM files could also be used.
Sdbsearch.cgi on SuSE Linux 7.1 and 7.2 is not exploitable, because
Perl's taint mode is used, nevertheless the HTTP_REFERER variable is still
unfiltered and fully trusted. So, users of SuSE Linux 7.1 and 7.2 are
not in danger but should update to avoid future attacks.
Please update your machines with the new RPMs from our ftp server.
i386 Intel Platform:
SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/doc1/sdb-2001.5.15-6.noarch.rpm
4230c06f2e703753e79ee0e50339567b
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sdb-2001.5.15-6.src.rpm
7090b18b0f5eeb3a4459134eda2b05ee
SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/doc1/sdb-2001.1.18-2.noarch.rpm
5db3cb4341829769eea4d1f9c7466800
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sdb-2001.1.18-2.src.rpm
97898cb2e0cd184b01dd8e6309ab166b
SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/doc1/sdb-2000.7.14-3.noarch.rpm
f12bc106ec92359c7c382ef1e103656f
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/sdb-2000.7.14-3.src.rpm
4c9034a7376f8cf2e554f7d41e57b984
SuSE-6.4
ftp://ftp.suse.com/pub/suse/i386/update/6.4/doc1/sdb-2000.3.13-1.noarch.rpm
0627c5db673924c7f7a5526b3fc56f0d
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/sdb-2000.3.13-1.src.rpm
d71b0df1e08745f15b8d95d66718e2b4
SuSE-6.3
ftp://ftp.suse.com/pub/suse/i386/update/6.3/doc1/sdb-99.11.8-10.noarch.rpm
9917fe4a3735dfb568a60af8c919c26f
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/sdb-99.11.8-10.src.rpm
3c0d5d7fe8b5720350b501deca82beca
Sparc Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/doc1/sdb-2001.1.18-0.noarch.rpm
f33dd4b47cdb20eaec420353a570da41
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/sdb-2001.1.18-0.src.rpm
a2b3a11161c24decfa7e52ccf668d613
SuSE-7.0
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/doc1/sdb-2000.7.14-0.noarch.rpm
ee8010587e5a6424fd4c83d2dbf0d3ef
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/sdb-2000.7.14-0.src.rpm
0a2af53aa95673e3f3ee45195f09b4dc
AXP Alpha Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/axp/update/7.1/doc1/sdb-2001.1.18-0.noarch.rpm
b9329d16642aaa28b3560db19c40ca29
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sdb-2001.1.18-0.src.rpm
27df8d88110edb5f9c2476e0f5da2eb0
SuSE-7.0
ftp://ftp.suse.com/pub/suse/axp/update/7.0/doc1/sdb-2000.7.14-0.noarch.rpm
0cbca12b0256424db89d8c0d6d860c7a
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/sdb-2000.7.14-0.src.rpm
9ff9e6d196f90309c752e0a9308ded56
SuSE-6.4
ftp://ftp.suse.com/pub/suse/axp/update/6.4/doc1/sdb-2000.3.13-0.noarch.rpm
1dc3c27aabadcf64556412e7e388b2d7
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/sdb-2000.3.13-0.src.rpm
300beb396532ea3ad9b390de90be1cd6
SuSE-6.3
ftp://ftp.suse.com/pub/suse/axp/update/6.3/doc1/sdb-99.11.8-2.noarch.rpm
ab236bf7c71b3081eac9f1897fe3d135
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/sdb-99.11.8-2.src.rpm
07ddf02d2c245bfc6f66e81a25ee99a4
PPC PowerPC Platform:
SuSE-7.1
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/doc1/sdb-2001.1.18-0.noarch.rpm
aa2e8090238df36f982d9829257bdb7c
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sdb-2001.1.18-0.src.rpm
54baed3e4631595f61111b71b7245785
SuSE-7.0
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/doc1/sdb-2000.7.14-0.noarch.rpm
75d51a9cc5ee4ea0dd0a20bceba17383
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/sdb-2000.7.14-0.src.rpm
2bded9520b27c41a9df74b3a41d73daf
SuSE-6.4
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/doc1/sdb-2000.3.13-0.noarch.rpm
009dcfd705d5528f21b81c2befaa8187
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/sdb-2000.3.13-0.src.rpm
029868fdc7d369515f0fb8d5b6be2532
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
Please watch out for more announcements that are currently in our queue.
______________________________________________________________________________
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 advise against subscribing to 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>.
The <security@suse.com> 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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Bye,
Thomas
--
Thomas Biege, SuSE GmbH, Schanzaeckerstr. 10, 90443 Nuernberg
E@mail: thomas@suse.de 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 84
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