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Category:   Application (VoIP)  >   Asterisk Vendors:   Digium (Linux Support Services)
Asterisk IAX2 Channel Driver Resource Consumption Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1018472
SecurityTracker URL:
CVE Reference:   CVE-2007-4103   (Links to External Site)
Updated:  Apr 25 2008
Original Entry Date:  Jul 30 2007
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.2.23 and 1.4.9
Description:   A vulnerability was reported in Asterisk. A remote user can cause denial of service conditions.

When configured to allow unauthenticated calls, a remote user can send a flood of NEW packets to initiate calls and cause the system to allocate resources and never deallocate them. This can cause a system to become unusable within a few seconds.

A restart is required to return to normal operations.

If the guest account or any other account that does not have a password is enabled, the system may be affected.

Russell Bryant reported this vulnerability.

Impact:   A remote user can cause the system to become unusable.
Solution:   The vendor has issued fixed versions for the various editions of Asterisk.

The Asterisk advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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