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[RedHat] "Cookie Path Traversal Issue" in kdelibs - RHSA-2004:075-01

To: win-sec-ssc@xxxxxxxxxxx
Subject: [RedHat] "Cookie Path Traversal Issue" in kdelibs - RHSA-2004:075-01
From: win-sec-ssc@xxxxxxxxxxx
Date: Thu, 11 Mar 2004 10:04:47 +0100 (MET)
Delivery-date: Thu, 11 Mar 2004 10:06:40 +0100
Envelope-to: win-sec-ssc@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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Liebe Kolleginnen und Kollegen,

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

CAN-2003-0592

  Die Spezifikation fuer HTTP Cookies erlaubt dem Web-Server die
  (optionale) Angabe von URLs auf dem Webserver, fuer die das Cookie
  vom Web-Client an den Webserver gesendet werden soll.

  Durch Angabe relativer Pfadnamen (../) bzw. durch Kodierung von
  Zeichen im URL (z.B. "%2e" fuer "."), ist es moeglich diese Be-
  schraenkungen zu umgehen.

  Ein Angreifer kann durch Angabe solcher Cookies den Browser dazu
  bringen, das Cookie auch an URLs auf dem Webserver mitzusenden, fuer
  die das eigentlich nicht vorgesehen ist. Der Angreifer hat dann die
  Moeglichkeit, evtl. vertrauliche Informationen aus dem Cookie aus-
  zulesen, z.B. Session IDs oder Passworte gesicherter Web-Sessions.

  Diese Schwachstelle besteht in den URL Routinen der kdelibs, die
  wiederum im Konqueror Webbrowser des KDE Systems verwendet werden.

  Dabei muessen jedoch einige Randbedingungen erfuellt sein

  1) Die Seiten des Angreifers, an die das Cookie gesendet wird,
     muessen sich auf demselben Webserver befinden wie die
     "Original"-Seiten.

  2) Dem Browser des Opfers muessen entsprechende Cookies unter-
     geschoben werden. 

  3) Das Opfer muss dazu gebracht werden, den entsprechenden Ziel-URL
     des Angreifers auf dem Webserver anzusteuern.

  Weitere Informationen zu dieser "Cookie Path Traversal Issue" finden
  Sie unter

     http://www.corsaire.com/advisories/c030712-001.txt

Betroffen ist RedHat Linux 9.0 auf Intel Plattformen. Der Hersteller
stellt Patches zur Behebung der Schwachstell bereit.

(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,
		Klaus Moeller, DFN-CERT



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                   Red Hat Security Advisory

Synopsis:          Updated kdelibs packages resolve cookie security issue
Advisory ID:       RHSA-2004:075-01
Issue date:        2004-03-10
Updated on:        2004-03-10
Product:           Red Hat Linux
Keywords:          
Cross references:  
Obsoletes:         
CVE Names:         CAN-2003-0592
- - ---------------------------------------------------------------------

1. Topic:

Updated kdelibs packages that fix a flaw in cookie path handling are now
available.

2. Relevant releases/architectures:

Red Hat Linux 9 - i386

3. Problem description:

Konqueror is a file manager and Web browser for the K Desktop Environment
(KDE).

Flaws have been found in the cookie path handling between a number of Web
browsers and servers.  The HTTP cookie standard allows a Web server
supplying a cookie to a client to specify a subset of URLs on the origin
server to which the cookie applies.  Web servers such as Apache do not
filter returned cookies and assume that the client will only send back
cookies for requests that fall within the server-supplied subset of URLs.
However, by supplying URLs that use path traversal (/../) and character
encoding, it is possible to fool many browsers into sending a cookie to a
path outside of the originally-specified subset.

KDE version 3.1.3 and later include a patch to Konquerer that disables the
sending of cookies to the server if the URL contains such encoded
traversals.  Red Hat Linux 9 shipped with KDE 3.1 and is therefore
vulnerable to this issue.

Users of Konquerer are advised to upgrade to these erratum packages, which
contain a backported patch for 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.

If up2date fails to connect to Red Hat Network due to SSL Certificate 
Errors, you need to install a version of the up2date client with an updated 
certificate.  The latest version of up2date is available from the Red Hat 
FTP site and may also be downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

5. RPMs required:

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/kdelibs-3.1-13.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/kdelibs-3.1-13.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/kdelibs-devel-3.1-13.i386.rpm



6. Verification:

MD5 sum                          Package Name
- - --------------------------------------------------------------------------

c6160cfd6b412cd60c8a55abfdeac022 9/en/os/SRPMS/kdelibs-3.1-13.src.rpm
b54a0acde508064c10e87eb735b95543 9/en/os/i386/kdelibs-3.1-13.i386.rpm
dfee8cfc2b14117fb3d00908198849f3 9/en/os/i386/kdelibs-devel-3.1-13.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available from https://www.redhat.com/security/keys.html

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 md5sum with the following command:
    
    md5sum <filename>


7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0592

8. Contact:

The Red Hat security contact is <secalert@xxxxxxxxxx>.  More contact
details at https://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.
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- -- 
Dipl. Inform. Klaus Moeller  (CSIRT)              DFN-CERT Services GmbH
https://www.dfn-cert.de/                               +49-40-808077-555
PGP RSA/2048, 0BB7C8F9, 6D CC 59 0F 86 0C 58 4D  35 D7 0C 55 EF 4F 42 23

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