[gentoo-announce] [ GLSA 200805-20 ] GnuTLS: Execution of arbitrary code

[news 28]

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Gentoo Linux Security Advisory GLSA 200805-20

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http://security.gentoo.org/

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Severity: High

Title: GnuTLS: Execution of arbitrary code

Date: May 21, 2008

Bugs: #222823

ID: 200805-20

 

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Synopsis

========

 

Multiple vulnerabilities might allow for the execution of arbitrary

code in daemons using GnuTLS.

 

Background

==========

 

GnuTLS is an implementation of Secure Sockets Layer (SSL) 3.0 and

Transport Layer Security (TLS) 1.0, 1.1 and 1.2.

 

Affected packages

=================

 

-------------------------------------------------------------------

Package / Vulnerable / Unaffected

-------------------------------------------------------------------

1 net-libs/gnutls < 2.2.5 >= 2.2.5

 

Description

===========

 

Ossi Herrala and Jukka Taimisto of Codenomicon reported three

vulnerabilities in libgnutls of GnuTLS:

 

* "Client Hello" messages containing an invalid server name can lead

to a buffer overflow when evaluating "Security Parameters"

(CVE-2008-1948).

 

* Multiple "Client Hello" messages can lead to a NULL pointer

dereference (CVE-2008-1949).

 

* A TLS handshake including an encrypted "Client Hello" message and

an invalid record length could lead to a buffer overread

(CVE-2008-1950).

 

Impact

======

 

Unauthenticated remote attackers could exploit these vulnerabilities to

cause Denial of Service conditions in daemons using GnuTLS. The first

vulnerability (CVE-2008-1948) might allow for the execution of

arbitrary code with the privileges of the daemon handling incoming TLS

connections.

 

Workaround

==========

 

There is no known workaround at this time.

 

Resolution

==========

 

All GnuTLS users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=net-libs/gnutls-2.2.5"

 

References

==========

 

[ 1 ] CVE-2008-1948

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1948

[ 2 ] CVE-2008-1949

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1949

[ 3 ] CVE-2008-1950

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1950

 

Availability

============

 

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-200805-20.xml

 

Concerns?

=========

 

Security is a primary focus of Gentoo Linux and ensuring the

confidentiality and security of our users machines is of utmost

importance to us. Any security concerns should be addressed to

security ( -at -) gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.

 

License

=======

 

Copyright 2008 Gentoo Foundation, Inc; referenced text

belongs to its owner(s).

 

The contents of this document are licensed under the

Creative Commons - Attribution / Share Alike license.

 

http://creativecommons.org/licenses/by-sa/2.5