CVE-2019-18790 Missing authorization in n/a
Attackers can hijack SIP calls by changing peer IP addresses without authentication when NAT settings are default, affecting Asterisk PBX systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-18790?
CVE-2019-18790 is a medium-severity missing authorization vulnerability in Debian Debian Linux, published on 22 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. 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.
Weakness: CWE-862
Which versions are affected by CVE-2019-18790?
It affects 3 products.
Products include Debian Debian Linux, Digium Asterisk, Digium Certified Asterisk.
How do I fix CVE-2019-18790?
Upgrade to a fixed version.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2019-18790 being exploited?
There is no known exploitation of CVE-2019-18790 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2019-18790, CVE-2019-18351, DEBIAN-CVE-2019-18790, GHSA-xv3q-rp6x-hwhw, UBUNTU-CVE-2019-18790.