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[RedHat] Schwachstellen in Mozilla - RHSA-2004:112-01
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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgendes RedHat Security Advisory ueber
Sicherheitsprobleme bei Mozilla. Wir geben diese Informationen
unveraendert an Sie weiter.
1) CAN-2004-0191
Noch waehrend eine Seite geladen wird, ist es Code der Javascript
Event Handler aus der vorherigen Seite (Zombie Document) moeglich,
im Security Context der neuen Seite zu agieren. Dies kann von
Angreifern ueber das Netz im Rahmen von Cross-Site-Scripting
Attacken ausgenutzt werden.
2) CAN-2003-0564, CERT/CC VU#428230
Der Mail-Client von Mozilla unterstuetzt S/MIME, was sich wiederum
auf ASN.1 zur Codierung verschiedener Datenstrukturen abstuetzt.
Das britische NISCC hat eine Testsuite fuer ASN.1 Anwendungen
entwickeln lassen. Im Verlauf dieser Testsuite wurden eine Reihe
von Schwachstellen in ASN.1 Bearbeitung der Mozilla S/MIME Routinen
entdeckt.
Ein Angreifer kann ueber das Netz den Mozilla Mail Clienten zum
Absturz bringen bzw. beliebigen Code mit den Privilegien des Opfers
ausfuehren, indem er eine entsprechend formulierte S/MIME Mail an
das Opfer schickt.
Weitere Informationen hierzu finden Sie unter:
http://www.uniras.gov.uk/vuls/2003/006489/smime.htm
3) CAN-2003-0594
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. Der Hersteller stellt ueberarbeitete
Pakete zur Behebung der Schwachstelle 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 Mozilla packages fix security issues
Advisory ID: RHSA-2004:112-01
Issue date: 2004-03-17
Updated on: 2004-03-17
Product: Red Hat Linux
Keywords: nss mozilla
Cross references:
Obsoletes:
CVE Names: CAN-2003-0564 CAN-2003-0594 CAN-2004-0191
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1. Topic:
Updated Mozilla packages that fix vulnerabilities in S/MIME parsing as well
as other issues and bugs are now available.
2. Relevant releases/architectures:
Red Hat Linux 9 - i386
3. Problem description:
Mozilla is a Web browser and mail reader, designed for standards
compliance, performance and portability. Network Security Services (NSS)
is a set of libraries designed to support cross-platform development of
security-enabled server applications.
NISCC testing of implementations of the S/MIME protocol uncovered a number
of bugs in NSS versions prior to 3.9. The parsing of unexpected ASN.1
constructs within S/MIME data could cause Mozilla to crash or consume large
amounts of memory. A remote attacker could potentially trigger these bugs
by sending a carefully-crafted S/MIME message to a victim. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2003-0564 to this issue.
Andreas Sandblad discovered a cross-site scripting issue that affects
various versions of Mozilla. When linking to a new page it is still
possible to interact with the old page before the new page has been
successfully loaded. Any Javascript events will be invoked in the context
of the new page, making cross-site scripting possible if the different
pages belong to different domains. The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CAN-2004-0191 to
this issue.
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. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2003-0594 to this issue.
Users of Mozilla are advised to upgrade to these updated packages, which
contain Mozilla version 1.4.2 and are not vulnerable to 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 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/galeon-1.2.13-0.9.0.src.rpm
ftp://updates.redhat.com/9/en/os/SRPMS/mozilla-1.4.2-0.9.0.src.rpm
i386:
ftp://updates.redhat.com/9/en/os/i386/galeon-1.2.13-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-1.4.2-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-chat-1.4.2-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-devel-1.4.2-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-dom-inspector-1.4.2-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-js-debugger-1.4.2-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-mail-1.4.2-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-nspr-1.4.2-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-nspr-devel-1.4.2-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-nss-1.4.2-0.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mozilla-nss-devel-1.4.2-0.9.0.i386.rpm
6. Verificationx:
MD5 sum Package Name
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992ef9250ed9c98cebbb8dece0b42a40 9/en/os/SRPMS/galeon-1.2.13-0.9.0.src.rpm
392c1e8d54668de9114ced4cb26f2239 9/en/os/SRPMS/mozilla-1.4.2-0.9.0.src.rpm
4246168924d57be9a4b3549e119c0fa7 9/en/os/i386/galeon-1.2.13-0.9.0.i386.rpm
0fba1f22954569f2fe62b20c12badde8 9/en/os/i386/mozilla-1.4.2-0.9.0.i386.rpm
f36041c9afacb8ac07d7caf0ffba5636 9/en/os/i386/mozilla-chat-1.4.2-0.9.0.i386.rpm
134a3539d5f3d3de4456bb2c2b70948d 9/en/os/i386/mozilla-devel-1.4.2-0.9.0.i386.rpm
0bfad47e55d2d8202a5dc80b504cf68b 9/en/os/i386/mozilla-dom-inspector-1.4.2-0.9.0.i386.rpm
e5a9af2c6b720adb3ca8f831568ce208 9/en/os/i386/mozilla-js-debugger-1.4.2-0.9.0.i386.rpm
8909de56f2915ffb9c3adbedad0da0dc 9/en/os/i386/mozilla-mail-1.4.2-0.9.0.i386.rpm
f4d1279c459694868473c8ad2609b490 9/en/os/i386/mozilla-nspr-1.4.2-0.9.0.i386.rpm
3a2f9360085c0ecb0a312da2dec1e703 9/en/os/i386/mozilla-nspr-devel-1.4.2-0.9.0.i386.rpm
5198348d07a15c8a064688baf03f4aea 9/en/os/i386/mozilla-nss-1.4.2-0.9.0.i386.rpm
cb849bc1da29db4d3e5a9e50e708fae6 9/en/os/i386/mozilla-nss-devel-1.4.2-0.9.0.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://www.mozilla.org/projects/security/pki/nss/#NSS_39
http://bugzilla.mozilla.org/show_bug.cgi?id=227417
http://www.niscc.gov.uk/
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0564
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0594
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0191
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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