Bug 28592 – CRIME-SSL-Angriff

Bug 28592 - CRIME-SSL-Angriff


Summary:	CRIME-SSL-Angriff

Status:	CLOSED WONTFIX

Product:	UCS
Classification:	Unclassified
Component:	Security updates
Version:	UCS 3.0
Hardware:	Other Linux

Importance:	P3 normal (vote)
Target Milestone:	UCS 3.0-x-errata
Assigned To:	Security maintainers
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Reported:	2012-09-18 16:56 CEST by Moritz Muehlenhoff
Modified:	2019-04-11 19:24 CEST (History)
CC List:	0 users

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Description Moritz Muehlenhoff

2012-09-18 16:56:27 CEST

CVE-2012-4929 / CVE-2012-4930

SSL/TLS und SDPY verwenden optional Kompression für die verschlüsselten Pakete. Ein Man-in-the-Middle kann dadurch z.B. einen Cookie bruteforcen:
http://security.blogoverflow.com/2012/09/how-can-you-protect-yourself-from-crime-beasts-successor/

Sowohl der Server, als auch der Client müssen SSL-Kompression unterstützen.

Die Firefox-Versionen in UCS 2.4/3.0 verwenden keine SSL-Kompression.

GNU TLS implementiert SSL-Kompression, es ist aber per Default deaktiviert. Es sind aktuell keine Applikationen bekannt, die es aktivieren.

In OpenSSL ist es standardmässig aktiviert.

Comment 1 Moritz Muehlenhoff

2012-11-30 15:54:13 CET

Die SSL-Implementierung in QT ist ebenfalls betroffen.

Für Apache gibt es ein Update, das SSL-Kompression serverseitig deaktiviert.

Comment 2 Moritz Muehlenhoff

2013-07-01 08:26:06 CEST

The maintenance with bug and security fixes for UCS 3.0-x has ended on 30th June 2013. 

The maintenance of the UCS 3.x major series is continued by UCS 3.1-x that is
supplied with bug and security fixes.

Customers still on UCS 3.0-x are encouraged to update to UCS 3.1 that contains,
among other things, Linux Kernel 3.2, Univention App Center, an update of Samba
3 and Samba 4, support for Microsoft Windows 2012 and Windows 8. Please contact
your partner or Univention for any questions.