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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2019-18790)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - An issue was discovered in manager.c in Sangoma Asterisk through 13.x, 16.x, 17.x and Certified Asterisk
    13.21 through 13.21-cert4. A remote authenticated Asterisk Manager Interface (AMI) user without system
    authorization could use a specially crafted Originate AMI request to execute arbitrary system commands.
    (CVE-2019-18610)

  - 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. (CVE-2019-18790)

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2969 advisory.

    Brief introduction CVE-2019-13161 Description CVE-2019-18610 Description CVE-2019-18790 Description     CVE-2019-18976 Description CVE-2020-28242 Description For Debian 9 stretch, these problems have been fixed     in version 1:13.14.1~dfsg-2+deb9u6. We recommend that you upgrade your asterisk packages. For the detailed     security status of asterisk please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/asterisk Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Asterisk project reports :

A SIP request can be sent to Asterisk that can change a SIP peers 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 peers 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.

ID	Name	Product	Family	Severity
252357	Linux Distros Unpatched Vulnerability : CVE-2019-18790	Nessus	Misc.	medium
423667	Alpine: multiple asterisk packages: security update to 16.6.2-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
423667	Alpine: multiple asterisk packages: security update to 16.6.2-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
403584	Alpine: asterisk: security update to 16.3.0-r3	Tenable Cloud Security	Alpine Linux Local Security Checks	high
403584	Alpine: asterisk: security update to 16.3.0-r3	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
400477	Alpine: multiple asterisk packages: security update to 16.5.1-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	high
400477	Alpine: multiple asterisk packages: security update to 16.5.1-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
159473	Debian DLA-2969-1 : asterisk - LTS security update	Nessus	Debian Local Security Checks	high
131262	FreeBSD : asterisk -- SIP request can change address of a SIP peer (a8d94711-0d03-11ea-87ca-001999f8d30b)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2019-18790

medium

Tenable Plugins

medium

high

high

high

high

high

high

high

medium