Candidate: CVE-2020-28242
PublicDate: 2020-11-06 06:15:00 UTC
References:
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28242
 http://downloads.asterisk.org/pub/security/AST-2020-002.html
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.
Ubuntu-Description:
Notes:
Mitigation:
Bugs:
Priority: medium
Discovered-by: Sebastian Damm, Ruslan Lazin
Assigned-to:
CVSS:
 nvd: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H [6.5 MEDIUM]


Patches_asterisk:
 upstream: http://downloads.asterisk.org/pub/security/AST-2020-002-13.diff
 upstream: http://downloads.asterisk.org/pub/security/AST-2020-002-16.diff
upstream_asterisk: released (1:16.15.0~dfsg-1)
precise/esm_asterisk: DNE
trusty_asterisk: ignored (out of standard support)
trusty/esm_asterisk: DNE
xenial_asterisk: ignored (end of standard support, was needed)
bionic_asterisk: needed
focal_asterisk: needed
groovy_asterisk: ignored (reached end-of-life)
hirsute_asterisk: not-affected (1:16.15.0~dfsg-1)
impish_asterisk: not-affected (1:16.15.0~dfsg-1)
jammy_asterisk: not-affected (1:16.15.0~dfsg-1)
devel_asterisk: not-affected (1:16.15.0~dfsg-1)