Bug 1548090 (CVE-2018-7285)

Summary: CVE-2018-7285 asterisk: NULL Pointer Dereference in RTP
Product: [Other] Security Response Reporter: Laura Pardo <lpardo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: bennie.joubert, itamar, jsmith.fedora, rbryant
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: asterisk 15.2.2 Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-08 03:40:53 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: 1548091, 1548092    
Bug Blocks:    

Description Laura Pardo 2018-02-22 16:53:27 UTC 
A NULL pointer access issue was discovered in Asterisk 15.x through 15.2.1. The RTP support in Asterisk maintains its own registry of dynamic codecs and desired payload numbers. While an SDP negotiation may result in a codec using a different payload number, these desired ones are still stored internally. When an RTP packet was received, this registry would be consulted if the payload number was not found in the negotiated SDP. This registry was incorrectly consulted for all packets, even those which are dynamic. If the payload number resulted in a codec of a different type than the RTP stream (for example, the payload number resulted in a video codec but the stream carried audio), a crash could occur if no stream of that type had been negotiated. This was due to the code incorrectly assuming that a stream of that type would always exist.


References:
http://downloads.asterisk.org/pub/security/AST-2018-001.html
https://issues.asterisk.org/jira/browse/ASTERISK-27488

Patch:
http://downloads.asterisk.org/pub/security/AST-2018-001-15.diff
Comment 1 Laura Pardo 2018-02-22 16:53:50 UTC 
Created asterisk tracking bugs for this issue:

Affects: epel-6 [bug 1548092]
Affects: fedora-all [bug 1548091]
Comment 2 Product Security DevOps Team 2019-06-08 03:40:53 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.