Bug 1895395 (CVE-2020-28242)

Summary:	CVE-2020-28242 asterisk: outbound INVITE loop on challenge with different nonce
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bennie.joubert, itamar, jsmith.fedora, rbryant
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-06 20:21:11 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1895396, 1895397
Bug Blocks:	1895428

Description Guilherme de Almeida Suckevicz 2020-11-06 14:55:36 UTC

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.

Reference:
http://downloads.asterisk.org/pub/security/AST-2020-002.html

Comment 1 Guilherme de Almeida Suckevicz 2020-11-06 14:55:55 UTC

Created asterisk tracking bugs for this issue:

Affects: epel-all [bug 1895397]
Affects: fedora-all [bug 1895396]

Comment 2 Jared Smith 2020-11-06 20:05:18 UTC

Updated packages already pushed to Rawhide.  I will update EPEL early next week.

Comment 3 Product Security DevOps Team 2020-11-06 20:21:11 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.