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Home » Hacking News » Suse - SuSE-SA:2001:046

Suse - SuSE-SA:2001:046

by Nikola Strahija on December 28th, 2001 The file globbing (matching filenames against patterns such as "*.bak") routines in the glibc exhibits an error that results in a heap corruption and that may allow a remote attacker to execute arbitrary commands from processes that take globbing strings from user input.


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

______________________________________________________________________________

SuSE Security Announcement

Package: glibc/shlibs, in.ftpd
Announcement-ID: SuSE-SA:2001:046
Date: Monday, Dec 24th 2001 19:00 MET
Affected SuSE versions: (6.3), 6.4, 7.0, 7.1, 7.2, 7.3
Vulnerability Type: remote privilege escalation
Severity (1-10): 8
SuSE default package: yes
Other affected systems: Most Linux systems

Content of this advisory:
1) security vulnerability resolved: glibc/shlibs
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

This security announcement obsoletes SuSE-SA:2001:001 about glibc (shlibs).

The file globbing (matching filenames against patterns such as "*.bak")
routines in the glibc exhibits an error that results in a heap corruption
and that may allow a remote attacker to execute arbitrary commands from
processes that take globbing strings from user input.
Tom Parker, Global InterSec LLC, addressed SuSE Security and illustrated
an attack scenario against the BSD-derived ftp daemon that is installed
as /usr/sbin/in.ftpd in SuSE Linux distributions. The said in.ftpd should
not be confused with the Washington University ftp daemon (wu-ftpd) that
comes installed as /usr/sbin/wu.ftpd in SuSE Linux and uses its own
globbing functions.

Since the attack against in.ftpd is based on a heap corruption in glibc,
the proper solution for the error is to exchange the responsible code in
the glibc globbing functions. It should be expected that other network
service daemons that accept user-supplied globbing strings such as rsyncd
can be exploited with this glibc globbing error. There is no satisfactory
workaround against the problem other than updating the glibc libraries
with a fixed version. We provide update packages for this purpose.

Users of the SuSE Linux 6.3 distribution should upgrade their systems
to a newer product since security update support for SuSE Linux 6.3
has been discontinued two years after the release.

Notes, Special installation instructions:

* If you use YOU (Yast2 Online Update), the necessary update packages
will be selected automatically. Please consider reading the
PRECAUTIONS and the AFTERCARE paragraph below. A standalone desktop
installation should not face any problems with the update as long
as the system is not loaded during the update process.

* The glibc package consists of one source RPM package and multiple
binary RPM (sub-) packages. In order to resolve the errors in the
globbing functions, the source RPM package as well as the
documentation subpackages do not need to be installed. In fact,
you only need to install the updates for packages that you have
installed already on your system.
The different subpackages contain:
++ shared libraries
+ static libraries and header files
+ profiling and debugging versions of glibc
- timezone description files (package timezone)
- internationalization files (i18n)
- two documentation packages
The packages marked with "+" are necessary to update if they are
installed on your system. The source RPM does not need to be installed
unless you want to compile your own glibc binaries.


* The names of both the source RPM as well as the binary RPM (sub-)
packages have changed between different SuSE Linux distributions.
Overview:
dist | source-RPM | shared libs | static libs,header| profiling
-----------------------------------------------------------------------
6.4,7.0 libc shlibs libc libd
7.1,7.2,7.3 glibc glibc glibc-devel glibc-profile

Find out which of the four packages are installed on your system
according to the package names in the table. Use the command
rpm -q name_of_package
to query the package database for each name.
If you have your package list, download the packages that you need
from the URLs as listed below. Verify their integrity and authenticity
following the guidelines as described in section 3) of this security
announcement.


* PRECAUTIONS
The shared libraries package of the glibc is the most sensitive
part of a running Linux system, and modifications to it should be
handled with special care. During the update of the shlibs/glibc
package, runtime-linking the shared libraries is likely to fail for
processes that execute a new binary with the execve(2) system call.
Therefore, we recommend to bring a system to single user mode
("init S") to perform the package update. If this is not applicable
for operational reasons, a system receiving the update should be kept
as quiet as possible (no shell scripts of any kind, no cron jobs, no
incoming email).


* Update the shared libraries package first using the command
rpm -Uhv
The execution of this command must not be interrupted!
Then use the same command ("rpm -Uhv ...") to update the other
packages. The update of these packages is not critical.


* AFTERCARE
After performing the update, you should run the following command
on your system:
/sbin/ldconfig
ldconfig will rebuild the runtime linker cache. If you use YOU
(Yast2 Online Update), the ldconfig command will be executed
automatically at the end of the update.

The shared libraries that were installed on the system before the
update have been removed from the filesystem, but they are still
in use by the running applications. Therefore, the diskspace as well
as the memory will not be freed until the last process that uses
these files exits. We recommend to reboot the system to workaround
this problem.

i386 Intel Platform:


SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/a1/glibc-2.2.4-64.i386.rpm
ab4f2c0a14df2fc904a77e3093ab64c1
ftp://ftp.suse.com/pub/suse/i386/update/7.3/d1/glibc-devel-2.2.4-64.i386.rpm
30fecdf4a05cdbb563f89544d83d3832
ftp://ftp.suse.com/pub/suse/i386/update/7.3/d2/glibc-profile-2.2.4-64.i386.rpm
170136831b255f9fb4f7626bb0db118c
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/glibc-2.2.4-64.src.rpm
0e9042c4513fdab17574fcfa00d85a49


SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/a1/glibc-2.2.2-60.i386.rpm
7f6986a143c394217e8c25d7a337213b
ftp://ftp.suse.com/pub/suse/i386/update/7.2/d1/glibc-devel-2.2.2-60.i386.rpm
ec20c83a27d82909bf244260ce7a5918
ftp://ftp.suse.com/pub/suse/i386/update/7.2/d2/glibc-profile-2.2.2-60.i386.rpm
39663b28aa3460b3496543f1fc38bbb8
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/glibc-2.2.2-60.src.rpm
cdb94c3f69df860a331fcd767464d958


SuSE-7.1
ftp://ftp.suse.com/pub/suse/i386/update/7.1/a1/glibc-2.2-17.i386.rpm
bfe1b48b0f74b8ebe4887de7f433581d
ftp://ftp.suse.com/pub/suse/i386/update/7.1/d1/glibc-devel-2.2-17.i386.rpm
84e3b7aef3d13dda8e938a2d0be2a6a8
ftp://ftp.suse.com/pub/suse/i386/update/7.1/d2/glibc-profile-2.2-17.i386.rpm
b4260429e50687c3ec45c330f565aa3d
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/glibc-2.2-17.src.rpm
8060cd3ce8a70f2e7fbd646586e1ea55


SuSE-7.0
ftp://ftp.suse.com/pub/suse/i386/update/7.0/a1/shlibs-2.1.3-202.i386.rpm
c5e373b55d91ce4611548cace59015f1
ftp://ftp.suse.com/pub/suse/i386/update/7.0/d1/libc-2.1.3-202.i386.rpm
94e0ef7bcb2b1d12e35b2ecf4106e2a3
ftp://ftp.suse.com/pub/suse/i386/update/7.0/d2/libd-2.1.3-202.i386.rpm
27b725ec3b2f47609222dabe34798d6e
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/libc-2.1.3-202.src.rpm
be466007d22952ae08809e4a13cf7f74


SuSE-6.4
ftp://ftp.suse.com/pub/suse/i386/update/6.4/a1/shlibs-2.1.3-204.i386.rpm
9539d8a62365de6007fc6644ad41cfa6
ftp://ftp.suse.com/pub/suse/i386/update/6.4/d1/libc-2.1.3-204.i386.rpm
526f3261e684ecc94f7a3e5447cb47fa
ftp://ftp.suse.com/pub/suse/i386/update/6.4/d2/libd-2.1.3-204.i386.rpm
ac0d6067cff50b0b63ca3905a1c5728f
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/libc-2.1.3-204.src.rpm
0a0332bac56a42898b6e38caeaf8898b




Sparc Platform:

SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/a1/glibc-2.2.4-34.sparc.rpm
ec7a28d3ecd776b855f658bfb5c5c906
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/d1/glibc-devel-2.2.4-34.sparc.rpm
c1b948813f902d357733bc05a844c991
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/d2/glibc-profile-2.2.4-34.sparc.rpm
5c97f462e33a4d95ba740b82f57dde0c
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/glibc-2.2.4-34.src.rpm
1346299f187ceeaef241dbf45ff49f51


SuSE-7.1
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/a1/glibc-2.2-18.sparc.rpm
7562d1fce096b8b28205f1d35d7c127a
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/d1/glibc-devel-2.2-18.sparc.rpm
49930f964d3e0269a1cd8d94c1989bc0
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/d2/glibc-profile-2.2-18.sparc.rpm
0f5e8c3b667e0809213b3f54f1e50b13
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/glibc-2.2-18.src.rpm
c836663dd27b4ff476a12b1a8c0c9f90


SuSE-7.0
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/a1/shlibs-2.1.3-160.sparc.rpm
f2af7ef92554c60bd5a872de208d8b6f
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/d1/libc-2.1.3-160.sparc.rpm
7bdb705c7ebd03f4adce09a6809892c2
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/d2/libd-2.1.3-160.sparc.rpm
2b3306cb460f478db3429e23f823b995
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/libc-2.1.3-160.src.rpm
a64566e9fd63300019cfeef8f29f4818




AXP Alpha Platform:

SuSE-7.1
ftp://ftp.suse.com/pub/suse/axp/update/7.1/a1/glibc-2.2-26.alpha.rpm
6c859b49dfd1bfcb6a3c641b684d043b
ftp://ftp.suse.com/pub/suse/axp/update/7.1/d1/glibc-devel-2.2-26.alpha.rpm
650adc9694f047966d66ced86a4242b6
ftp://ftp.suse.com/pub/suse/axp/update/7.1/d2/glibc-profile-2.2-26.alpha.rpm
c6b9e63c4cbfeb4319259ef69588d8ed
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/glibc-2.2-26.src.rpm
c793e9da8291e45b9323c4fa4e85de67


SuSE-7.0
ftp://ftp.suse.com/pub/suse/axp/update/7.0/a1/shlibs-2.1.3-203.alpha.rpm
28e5a26227efba257f0c5aa81ecff74f
ftp://ftp.suse.com/pub/suse/axp/update/7.0/d1/libc-2.1.3-203.alpha.rpm
64ccdf133939fca4f47082c5092b348f
ftp://ftp.suse.com/pub/suse/axp/update/7.0/d2/libd-2.1.3-203.alpha.rpm
471b1a63ebdfcc9df3cf71423ac51b78
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/libc-2.1.3-203.src.rpm
08e3ef5b96cdd2a647bfd4db7a2cb55f


SuSE-6.4
ftp://ftp.suse.com/pub/suse/axp/update/6.4/a1/shlibs-2.1.3-204.alpha.rpm
798f75dbfb95b6917f79ed26c48de2fe
ftp://ftp.suse.com/pub/suse/axp/update/6.4/d1/libc-2.1.3-204.alpha.rpm
0851f8afd4cf6316263128f406af1df3
ftp://ftp.suse.com/pub/suse/axp/update/6.4/d2/libd-2.1.3-204.alpha.rpm
95b0e06e0328d3a4422b9139c5955cc5
source rpm:
ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/libc-2.1.3-204.src.rpm
d52cf0e58f6f8f9ef0749b2c0fca534a




PPC Power PC Platform:

SuSE-7.3
The update packages are delayed and are currently being built. They
will be available shortly at the same locations as the 7.1 packages,
with the 7.3 path segment, respectively.


SuSE-7.1
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/a1/glibc-2.2-25.ppc.rpm
298ad3b4eaf87f3656e096d5eb4f4a4d
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/d1/glibc-devel-2.2-25.ppc.rpm
6f31f5f7b055485f65e7c81ebf8f9d64
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/d2/glibc-profile-2.2-25.ppc.rpm
26d70564073e77a610562acf5ae27f1f
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/glibc-2.2-25.src.rpm
b76a1624d9be6dbb63ceb8803a5ed07f

SuSE-7.0
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/a1/shlibs-2.1.3-198.ppc.rpm
472cb2d66abdfb2a523ba57e15613f04
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/d1/libc-2.1.3-198.ppc.rpm
37e62fe7376e6f66defc6897abcae74d
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/d2/libd-2.1.3-198.ppc.rpm
6e8b150fddc5ea7ab8799b021cb20311
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/libc-2.1.3-198.src.rpm
b7b73eeb4c091302fff48284f6894d9b

SuSE-6.4
The update packages are delayed and are currently being built. They
will be available shortly at the same locations as the 7.0 packages,
with the 6.4 path segment, respectively.



______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- /bin/login vulnerabilities
A buffer overflow vulnerability has been reported for System V derived
implementations of the login program while it copies environment variables
from the login prompt to the user's future environment. SuSE Linux
distributions are unaffected by this problem. The login programs in
SuSE Linux distributions before and including SuSE Linux 6.1 contain
the environment copying feature. Versions shipped after (and including)
SuSE Linux 6.2 use PAM (Pluggable Authentication Module) routines for
logini- and password prompting. The PAM routines do not support
environment passing.

______________________________________________________________________________

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
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
to verify the signature of the package, where 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 .

[email protected]
- SuSE's announce-only mailing list.
Only SuSE's security annoucements are sent to this list.
To subscribe, send an email to
.

For general information or the frequently asked questions (faq)
send mail to:
or
respectively.

=====================================================================
SuSE's security contact is or .
The 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
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key

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Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

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