Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2002.220 -- RHSA-2002:062-08
Insecure DocBook stylesheet option
9 May 2002
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: DocBook
Vendor: Red Hat
Operating System: Red Hat Linux 6.2
Red Hat Linux 7.0
Red Hat Linux 7.1
Red Hat Linux 7.2
Impact: Overwrite Arbitrary Files
Access Required: Remote
- --------------------------BEGIN INCLUDED TEXT--------------------
- ---------------------------------------------------------------------
Red Hat, Inc. Red Hat Security Advisory
Synopsis: Insecure DocBook stylesheet option
Advisory ID: RHSA-2002:062-08
Issue date: 2002-04-11
Updated on: 2002-04-26
Product: Red Hat Linux
Keywords: docbook stylesheet
Cross references: RHSA-2002:061
Obsoletes:
- ---------------------------------------------------------------------
1. Topic:
DocBook is a document markup language that can be transformed into
other formats using a stylesheet. The default stylesheet provided
with Red Hat Linux has an insecure option enabled.
2. Relevant releases/architectures:
Red Hat Linux 6.2 - noarch
Red Hat Linux 7.0 - noarch
Red Hat Linux 7.1 - noarch
Red Hat Linux 7.2 - noarch
3. Problem description:
The default stylesheet used when converting a DocBook document to
multiple HTML files allows an untrusted document to write files
outside of the current directory. This is because element
identifiers (specified in the document) are used to form the names of
the output files. If an untrusted document uses a full pathname as an
identifier, it can cause that file to be written to -- as long as the
user performing the conversion has write access.
Updated docbook-utils packages are available that disable this
feature and enable filenames to be generated based on the type
of the element rather than its identifier.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0169 to this issue.
4. Solution:
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
To update all RPMs for your particular architecture, run:
rpm -Fvh [filenames]
where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains
the
desired RPMs.
Please note that this update is also available via Red Hat Network. Many
people find this an easier way to apply updates. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:
up2date
This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
6. RPMs required:
Red Hat Linux 6.2:
SRPMS:
ftp://updates.redhat.com/6.2/en/os/SRPMS/stylesheets-1.54.13rh-1.1.src.rpm
noarch:
ftp://updates.redhat.com/6.2/en/os/noarch/stylesheets-1.54.13rh-1.1.noarch.rpm
Red Hat Linux 7.0:
SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/stylesheets-1.54.13rh-5.1.src.rpm
noarch:
ftp://updates.redhat.com/7.0/en/os/noarch/stylesheets-1.54.13rh-5.1.noarch.rpm
Red Hat Linux 7.1:
SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/docbook-utils-0.6-13.2.src.rpm
noarch:
ftp://updates.redhat.com/7.1/en/os/noarch/docbook-utils-0.6-13.2.noarch.rpm
ftp://updates.redhat.com/7.1/en/os/noarch/docbook-utils-pdf-0.6-13.2.noarch.rpm
Red Hat Linux 7.2:
SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/docbook-utils-0.6.9-2.1.src.rpm
noarch:
ftp://updates.redhat.com/7.2/en/os/noarch/docbook-utils-0.6.9-2.1.noarch.rpm
ftp://updates.redhat.com/7.2/en/os/noarch/docbook-utils-pdf-0.6.9-2.1.noarch.rpm
7. Verification:
MD5 sum Package Name
- --------------------------------------------------------------------------
263e520f94a1685cef9f1e4cafc8e485 6.2/en/os/SRPMS/stylesheets-1.54.13rh-1.1.src.rpm
7065d23d1f0c1f7e9903d642f45e2b14 6.2/en/os/noarch/stylesheets-1.54.13rh-1.1.noarch.rpm
5147e48a9799d6c4be9e61986628cc9a 7.0/en/os/SRPMS/stylesheets-1.54.13rh-5.1.src.rpm
e1ce94d77e1bb5dbfda409b6f53f9858 7.0/en/os/noarch/stylesheets-1.54.13rh-5.1.noarch.rpm
faa79f4d0d834fb4ddb5a82ec9d2ad64 7.1/en/os/SRPMS/docbook-utils-0.6-13.2.src.rpm
affe6a01d519aedbf1f25783650e9e2a 7.1/en/os/noarch/docbook-utils-0.6-13.2.noarch.rpm
e56145c2247e7cc05f3dddba079db3cd 7.1/en/os/noarch/docbook-utils-pdf-0.6-13.2.noarch.rpm
1d68f5de2052550307fbb3182f751915 7.2/en/os/SRPMS/docbook-utils-0.6.9-2.1.src.rpm
e6b43a27e4712ee6a91871605092acab 7.2/en/os/noarch/docbook-utils-0.6.9-2.1.noarch.rpm
a45e3dddc9f3269c3db77bd153697df3 7.2/en/os/noarch/docbook-utils-pdf-0.6.9-2.1.noarch.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at:
http://www.redhat.com/about/contact/pgpkey.html
You can verify each package with the following command:
rpm --checksig <filename>
If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
rpm --checksig --nogpg <filename>
8. References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0169
Copyright(c) 2000, 2001, 2002 Red Hat, Inc.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/Information/advisories.html
If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for emergencies.
-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key
iQCVAwUBPNpkyih9+71yA2DNAQGbEQP5AcmOgNzfwH0u4kIkrgbyARY0Kri7kFtw
+ZFPTDCzuowx9IRebDrs5Rfg/klyeXYhEomnl35rj4aWkgKKiLpD0hFEyricEvQa
cjlEKpkXfpcvp7h9JYSTaGmyC2JSIA3kQ+Zug08D7UhBBwflXT12ywJQRI9fBN6f
pBhi/idkpaI=
=XSsJ
-----END PGP SIGNATURE-----