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Gentoo Linux Security Advisory                           GLSA 200804-27
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: SILC: Multiple vulnerabilities
      Date: April 24, 2008
      Bugs: #212362, #214116, #214812
        ID: 200804-27

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Synopsis
=======
Multiple vulnerabilities were found in SILC Client, Server, and
Toolkit, allowing for Denial of Service and execution of arbitrary
code.

Background
=========
SILC (Secure Internet Live Conferencing protocol) Toolkit is a software
development kit for use in clients, SILC Server is a communication
server, and SILC Client is an IRSSI-based text client.

Affected packages
================
    -------------------------------------------------------------------
     Package              /  Vulnerable  /                  Unaffected
    -------------------------------------------------------------------
  1  net-im/silc-toolkit       < 1.1.7                        >= 1.1.7
  2  net-im/silc-client        < 1.1.4                        >= 1.1.4
  3  net-im/silc-server        < 1.1.2                        >= 1.1.2
    -------------------------------------------------------------------
     3 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

Description
==========
* Nathan G. Grennan reported a boundary error in SILC Toolkit within
  the silc_fingerprint() function in the file lib/silcutil/silcutil.c
  when passing overly long data, resulting in a stack-based buffer
  overflow (CVE-2008-1227).

* A vulnerability has been reported in SILC Server which is caused
  due to an error in the handling of "NEW_CLIENT" packets that do not
  contain a nickname (CVE-2008-1429).

* Ariel Waissbein, Pedro Varangot, Martin Mizrahi, Oren Isacson,
  Carlos Garcia, and Ivan Arce of Core Security Technologies reported
  that SILC Client, Server, and Toolkit contain a vulnerability in the
  silc_pkcs1_decode() function in the silccrypt library (silcpkcs1.c),
  resulting in an integer underflow, signedness error, and a buffer
  overflow (CVE-2008-1552).

Impact
=====
A remote attacker could exploit these vulnerabilities to cause a Denial
of Service or execute arbitrary code with the privileges of the user
running the application.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All SILC Toolkit users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-im/silc-toolkit-1.1.7"

All SILC Client users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-im/silc-client-1.1.4"

All SILC Server users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-im/silc-server-1.1.2"

References
=========
  [ 1 ] CVE-2008-1227
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1227 
  [ 2 ] CVE-2008-1429
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1429 
  [ 3 ] CVE-2008-1552
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1552 

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200804-27.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@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 


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