S21SEC-036-EN Ekiga <= 2.0.5 Denial of service

[S21sec Labs <labs () s21sec com>]

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                     - S21Sec Advisory -
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    Title:              Ekiga Denial of Service
       ID:              S21SEC-036-en
 Severity:      Medium - Remote DoS
  History:              14.May.2007 Vulnerability discovered
                        09.Jul.2007 Vendor contacted

    Scope:      Application Denial of Service
Platforms:      Any
   Author:      Jose Miguel Esparza (jesparza () s21sec com)
      URL:              http://www.s21sec.com/avisos/s21sec-036-en.txt
  Release:      Public


[ SUMMARY ]

Ekiga (formely known as GnomeMeeting) is an open source VoIP and  
video conferencing application for
GNOME. Ekiga uses both the H.323 and SIP protocols. It supports many  
audio and video codecs, and is
interoperable with other SIP compliant software and also with  
Microsoft NetMeeting.


[ AFFECTED VERSIONS ]

Following versions are affected with this issue:
        - Ekiga 2.0.5 and prior.


[ DESCRIPTION ]

Due to a bad management of memory allocation for the input data it's  
possible to crash the application
causing a denial of service.


[ WORKAROUND ]

Upgrade to 2.0.7 or 2.0.9 versions is recommended to resolve this  
problem. If not possible, some
additional input data check will be necessary in the  
SIPURL::GetHostAddress() function.


[ ACKNOWLEDGMENTS ]

This vulnerability have been found and researched by:
        - Jose Miguel Esparza <jesparza () s21sec com> S21Sec


[ ADDITIONAL INFORMATION ]

This vulnerability has been discovered thanks to the network fuzzer  
Malybuzz disponible in the url
http://malybuzz.sourceforge.net/.


[ REFERENCES ]

* Ekiga
  http://ekiga.org

* S21Sec
  http://www.s21sec.com

* S21sec Blog
  http://blog.s21sec.com

* Malybuzz
  http://www.s21sec.com/malybuzz/malybuzz.html