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Category:   Application (VoIP)  >   Columbia SIP User Agent (sipc) Vendors:   SIP Communications, Inc.
Columbia SIP User Agent (sipc) SIP Protocol Bugs Let Remote Users Deny Service
SecurityTracker Alert ID:  1006167
SecurityTracker URL:
CVE Reference:   CVE-2003-1110   (Links to External Site)
Updated:  Jul 7 2008
Original Entry Date:  Feb 25 2003
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.74
Description:   A vulnerability was reported in the Columbia Session Initiation Protocol (SIP) User Agent (sipc). A remote user may be able to cause denial of service on the IP telephony management software.

The Oulu University Secure Programming Group (OUSPG) and CERT (CA-2003-06) reported vulnerabilities in implementations of the Session Initiation Protocol (SIP), used for Voice over IP. OUSPG applied the PROTOS c07-sip test suite ( against several vendor products to test the processing of the SIP INVITE message, used to set up sessions.

The vulnerabilities affect several vendor implementations. In general, the vulnerabilities may allow a remote user to gain access to the system or cause denial of service conditions. However, it is reported that for sipc, only denial of service conditions apply.

It is reported that sipc contains vulnerabilities in the processing of SIP INVITE messages. A remote user can cause the sipc process to send responses to invalid addresses. A remote user may also be able to cause sipc to hang by sending either fragmented or improperly formatted SIP INVITE messages to the target system.

Impact:   A remote user can cause denial of service conditions on the system.
Solution:   The vendor has released a fixed version (version 2.0, build 2003-02-21), available from
Vendor URL: (Links to External Site)
Cause:   Boundary error, Exception handling error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  Sipc

Vulnerabilities Found by PROTOS SIP Test Suite


Sipc (version 1.74) contains vulnerabilities in the processing of Session Initiation Protocol (SIP)
INVITE messages. These vulnerabilities were identified by the University of Oulu Secure Programming
Group (OUSPG) "PROTOS" Test Suite for SIP and can be repeatedly exploited to produce a denial of
service. In sipc (version 2.0, build 2003-02-21), these vulnerabilities have been fixed.


Sipc (version 1.74) fails on several test-groups of "PROTOS" Test Suite for SIP . The test cases
cause sipc sending responses to invalid addresses or hanging on mis-formatted or fragmented SIP
INVITE messages. These vulnerabilities have been resolved in sipc (verson 2.0, build 2003-02-21)
with adding stricter address checking and more robust error handling functions.

Obtaining fixed software

Please contact for software upgrade for sipc (version 2.0, build 2003-02-21).


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