Vulnerability CVE-2019-18790


Published: 2019-11-22   Modified: 2019-11-24

Description:
An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x, 16.x, and 17.x, and Certified Asterisk 13.21, because of an incomplete fix for CVE-2019-18351. A SIP request can be sent to Asterisk that can change a SIP peer's IP address. A REGISTER does not need to occur, and calls can be hijacked as a result. The only thing that needs to be known is the peer's name; authentication details such as passwords do not need to be known. This vulnerability is only exploitable when the nat option is set to the default, or auto_force_rport.

Type:

CWE-862

(Missing Authorization)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5.8/10
4.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
Digium -> Asterisk 
Digium -> Certified asterisk 
Debian -> Debian linux 

 References:
http://downloads.asterisk.org/pub/security/AST-2019-006.html
https://lists.debian.org/debian-lts-announce/2019/11/msg00038.html
https://www.asterisk.org/downloads/security-advisories

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