[RedHat] Schwachstelle in cadaver - FLSA:1552

win-sec-ssc at dfn-cert.de win-sec-ssc at dfn-cert.de
Fri Oct 1 17:03:36 CEST 2004


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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgendes RedHat Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.

neon ist eine Bibliothek, die HTTP- and WebDAV-Funktionalitaet zur
Verfuegung stellt. WebDAV (Web-based Distributed Authoring and
Versioning) dient zur Verwaltung von Dateien auf einem Webserver ueber
das HTTP-Protokoll.

CAN-2004-0179 - Schwachstellen in neon-Bibliothek

  In der neon-Bibliothek, die von cadaver verwendet wird, werden einige
  Format Strings unsicher verwendet. Ein Angreifer kann diese
  Schwachstellen mittels eines entsprechend konstruierten WebDAV-Servers
  ausnutzen, um beliebige Befehle mit den Rechten des cadaver-Benutzers
  auszufuehren (wenn dieser eine Verbindung zum WebDAV-Server aufbaut).

CAN-2004-0398 - Schwachstelle in der Funktion ne_rfc1036_parse()

  In der neon-Bibliothek, die von cadaver verwendet wird, kann ein Heap
  Overflow in einer Funktion ausgeloest werden, die Datumsangaben parst.
  Ein Angreifer kann diese Schwachstelle mittels eines entsprechend
  konstruierten WebDAV-Servers ausnutzen, um beliebige Befehle mit den
  Rechten des cadaver-Benutzers auszufuehren. Der Benutzer muss dazu
  allerdings eine Verbindung zum WebDAV-Server aufbauen.


Betroffen sind die folgenden Software Pakete und Plattformen:

  Paket cadaver

in

  Red Hat Linux 7.3 - i386
  Red Hat Linux 9 - i386

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.

Mit freundlichen Gruessen,


           Jan Kohlrausch, DFN-CERT

- --
Jan Kohlrausch (CSIRT), DFN-CERT Services GmbH
Web: https://www.dfn-cert.de/, Phone: +49-40-808077-555
PGP RSA/2048, A5DD03D1, A2 55 1C 51 0A 30 3E 78  5B 40 DA B7 14 F7 C9 E8


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               Fedora Legacy Update Advisory

Synopsis:          Updated cadaver resolves security vulnerabilities
Advisory ID:       FLSA:1552
Issue date:        2004-09-29
Product:           Red Hat Linux
Keywords:          Security
Cross references:  https://bugzilla.fedora.us/show_bug.cgi?id=1552
CVE Names:         CAN-2004-0179, CAN-2004-0398
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1. Topic:

Updated cadaver packages that fix multiple security vulnerability are
now available.

2. Relevant releases/architectures:

Red Hat Linux 7.3 - i386
Red Hat Linux 9 - i386

3. Problem description:

An updated cadaver package that fixes a vulnerability in neon exploitable
by a malicious DAV server is now available.

cadaver is a command-line WebDAV client that uses inbuilt code from neon,
an HTTP and WebDAV client library.

Versions of the neon client library up to and including 0.24.4 have been
found to contain a number of format string bugs. An attacker could create
a malicious WebDAV server in such a way as to allow arbitrary code
execution on the client should a user connect to it using cadaver. The
Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned
the name CAN-2004-0179 to this issue. This issue was addressed in a previous
update for Red Hat Linux 9.

Stefan Esser discovered a flaw in the neon library which allows a heap
buffer overflow in a date parsing routine. An attacker could create
a malicious WebDAV server in such a way as to allow arbitrary code
execution on the client should a user connect to it using cadaver. The
Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned
the name CAN-2004-0398 to this issue.

Users of cadaver are advised to upgrade to this updated package, which
contains patches correcting these issues.

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 yum and apt.  Many 
people find this an easier way to apply updates.  To use yum issue:

yum update

or to use apt:

apt-get update; apt-get upgrade

This will start an interactive process that will result in the appropriate 
RPMs being upgraded on your system.  This assumes that you have yum or 
apt-get configured for obtaining Fedora Legacy content. Please visit 
http://www.fedoralegacy.org/docs/ for directions on how to configure yum 
and apt-get.

5. Bug IDs fixed:

http://bugzilla.fedora.us - 1552 - cadaver neon vulnerability (CAN-2004-0179)

6. RPMs required:

Red Hat Linux 7.3:

SRPM:
http://download.fedoralegacy.org/redhat/7.3/updates/SRPMS/cadaver-0.22.1-1.legacy.src.rpm

i386:
http://download.fedoralegacy.org/redhat/7.3/updates/i386/cadaver-0.22.1-1.legacy.i386.rpm

Red Hat Linux 9:

SRPM:
http://download.fedoralegacy.org/redhat/9/updates/SRPMS/cadaver-0.22.1-3.legacy.src.rpm

i386:
http://download.fedoralegacy.org/redhat/9/updates/i386/cadaver-0.22.1-3.legacy.i386.rpm

7. Verification:

SHA1 sum                                 Package Name
- ---------------------------------------------------------------------------

46931edc0f4e8ad25c994891938c103a45f28982  7.3/updates/SRPMS/cadaver-0.22.1-1.legacy.src.rpm
0c3742f3151d4dedc5e5320a3a4792f17e8bd2e4  7.3/updates/i386/cadaver-0.22.1-1.legacy.i386.rpm
6cc852676c85e9cc3dc8e472676185cdffabf09f  9/updates/SRPMS/cadaver-0.22.1-3.legacy.src.rpm
1a9d4e010885e902b2a6a994cfee5744b7f4afba  9/updates/i386/cadaver-0.22.1-3.legacy.i386.rpm

These packages are GPG signed by Fedora Legacy for security.  Our key is 
available from http://www.fedoralegacy org/about/security.php

You can verify each package with the following command:

    rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or 
tampered with, examine only the sha1sum with the following command:

    sha1sum <filename>

8. References:

http://security.e-matters.de/advisories/062004.html

9. Contact:

The Fedora Legacy security contact is <secnotice at fedoralegacy.org <mailto:secnotice at fedoralegacy.org>>. More 
project details at http://www.fedoralegacy.org

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