CVE-2020-28242

Name	CVE-2020-28242
Description	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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2969-1
Debian Bugs	974713

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
asterisk (PTS)	jessie, jessie (lts)	1:11.13.1~dfsg-2+deb8u8	vulnerable
	stretch (security)	1:13.14.1~dfsg-2+deb9u6	fixed
	stretch (lts), stretch	1:13.14.1~dfsg-2+deb9u10	fixed
	buster, buster (lts)	1:16.28.0~dfsg-0+deb10u5	fixed
	buster (security)	1:16.28.0~dfsg-0+deb10u4	fixed
	bullseye	1:16.28.0~dfsg-0+deb11u4	fixed
	bullseye (security)	1:16.28.0~dfsg-0+deb11u5	fixed
	sid	1:22.1.0~dfsg+~cs6.14.60671435-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
asterisk	source	jessie	(unfixed)	end-of-life
asterisk	source	stretch	1:13.14.1~dfsg-2+deb9u6		DLA-2969-1
asterisk	source	(unstable)	1:16.15.0~dfsg-1			974713

Notes

[buster] - asterisk <no-dsa> (Minor issue)
https://issues.asterisk.org/jira/browse/ASTERISK-29013
http://downloads.asterisk.org/pub/security/AST-2020-002.html