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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bennie.joubert, itamar, jsmith.fedora, rbryant
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Last Closed: 2020-11-06 20:21:11 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 1895397, 1895396    
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.