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.
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):needs-triage
Ubuntu 18.04 LTS (Bionic Beaver):needs-triage
Ubuntu 19.10 (Eoan Ermine):needs-triage
Ubuntu 20.04 LTS (Focal Fossa):needs-triage
Ubuntu 20.10 (Groovy Gorilla):not-affected (1:16.10.0~dfsg-1)
More Information

Updated: 2020-05-26 23:14:19 UTC (commit 3b56ac28a2ed4c70b6c1cb2dab4f566a0eeb248b)