An issue was discovered in PJSIP in Asterisk before 16.19.1 and before 18.5.1. To exploit, a re-INVITE without SDP must be received after Asterisk has sent a BYE request.

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 PJSIP in Asterisk before 16.19.1 and before 18.5.1. To exploit, a re-INVITE     without SDP must be received after Asterisk has sent a BYE request. (CVE-2021-31878)

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

The remote host is affected by the vulnerability described in GLSA-202412-03 (Asterisk: Multiple Vulnerabilities)

    Multiple vulnerabilities have been discovered in Asterisk. Please review the CVE identifiers referenced     below for details.

Tenable has extracted the preceding description block directly from the Gentoo Linux 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 :

When Asterisk receives a re-INVITE without SDP after having sent a BYE request a crash will occur. This occurs due to the Asterisk channel no longer being present while code assumes it is.

ID	Name	Product	Family	Type	Severity
252396	Linux Distros Unpatched Vulnerability : CVE-2021-31878	Nessus	Misc.	Local	medium
212188	GLSA-202412-03 : Asterisk: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	Local	critical
152072	FreeBSD : asterisk -- Remote Crash Vulnerability in PJSIP channel driver (ffa364e1-ebf5-11eb-aef1-0897988a1c07)	Nessus	FreeBSD Local Security Checks	Local	medium

Detections

Analytics

CVE-2021-31878

medium

Tenable Plugins

medium

critical

medium