An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a loop. This causes Asterisk to consume more and more memory since the transaction will never terminate (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound authentication must be configured on the endpoint for this to occur.

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 Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before     17.8.1, and 18.x before 18.0.1 and Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an     outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a     loop. This causes Asterisk to consume more and more memory since the transaction will never terminate     (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound     authentication must be configured on the endpoint for this to occur. (CVE-2020-28242)

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

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.

Update to upstream 17.9.0 for bug and security fixes

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
252367	Linux Distros Unpatched Vulnerability : CVE-2020-28242	Nessus	Misc.	medium
159473	Debian DLA-2969-1 : asterisk - LTS security update	Nessus	Debian Local Security Checks	high
143334	Fedora 33 : asterisk (2020-6b277646c7)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2020-28242

medium

Tenable Plugins

medium

high

medium