Articles / Red Hat: Insecure DocBook s…

Red Hat: Insecure DocBook stylesheet option

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. Fixed packages are available from updates.redhat.com.
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                   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:         
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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  

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 

8. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0169


Copyright(c) 2000, 2001, 2002 Red Hat, Inc.
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