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Category:   Application (VoIP)  >   Asterisk Vendors:   Digium (Linux Support Services)
Asterisk Lets Remote Users Bypass Proxy Authentication to Access the Target System
SecurityTracker Alert ID:  1037408
SecurityTracker URL:  http://securitytracker.com/id/1037408
CVE Reference:   CVE-2016-9938   (Links to External Site)
Updated:  Dec 13 2016
Original Entry Date:  Dec 9 2016
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 11.x, 13.x, 14.x
Description:   A vulnerability was reported in Asterisk. A remote user can bypass proxy authentication.

The chan_sip channel driver defines whitespace differently than a SIP proxy. As a result, if Asterisk is configured behind a SIP proxy, a remote user can supply specially crafted SIP header values to bypass proxy authentication and provide an INVITE request to the target Asterisk system.

Systems using dialog-aware proxies are not affected.

Systems using chan_pjsip rather than chan_sip are not affected.

Walter Doekes reported this vulnerability.

Impact:   A remote user can bypass proxy authentication to access the target system in certain cases.
Solution:   The vendor has issued a fix (11.25.1, 13.13.1, 14.2.1).

The vendor advisory is available at:

http://downloads.digium.com/pub/security/ASTERISK-2016-009.html

Vendor URL:  downloads.digium.com/pub/security/ASTERISK-2016-009.html (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.


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