DescriptionAn issue was discovered in channels/chan_sip.c in Sangoma Asterisk through 13.29.1, through 16.6.1, and through 17.0.0; and Certified Asterisk through 13.21-cert4. 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Technically CVE-2019-18790 exists because of an incomplete fix of CVE-2019-18351, both
referring to AST-2019-006. The upstream advisory never used though CVE-2019-18351, but
only referenced CVE-2019-18790. CVE-2019-18351 only got picked up later on.
check with MITRE if CVE-2019-18351 simply should be dropped

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