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Category:   Application (VoIP)  >   Asterisk Vendors:   Digium (Linux Support Services)
Asterisk PJSIP Algorithm Bug Lets Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1038529
SecurityTracker URL:
CVE Reference:   CVE-2017-9372   (Links to External Site)
Updated:  Jun 2 2017
Original Entry Date:  May 19 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Asterisk. A remote user can cause the target service to crash.

A remote user can send a SIP packet with a specially crafted CSeq header and a Via header with no branch parameter to trigger a buffer overflow in the PJSIP RFC 2543 transaction key generation algorithm and cause the target service to crash.

The vulnerability resides in the PJSIP component.

Systems using chan_sip are not affected.

Sandro Gauci reported this vulnerability.

Impact:   A remote user can cause the target service to crash.
Solution:   The vendor has issued a fix (13.15.1, 14.4.1).

The vendor advisory is available at:

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

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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