Bug 1930871 (CVE-2021-26717) - CVE-2021-26717 asterisk: remote crash possible when negotiating T.38
Summary: CVE-2021-26717 asterisk: remote crash possible when negotiating T.38
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-26717
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1930872
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-02-19 16:44 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-19 19:01 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2021-02-19 19:01:55 UTC
Embargoed:

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2021-02-19 16:44:51 UTC 
An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.

References:
https://downloads.asterisk.org/pub/security/AST-2021-002.html
https://issues.asterisk.org/jira/browse/ASTERISK-29203
Comment 1 Guilherme de Almeida Suckevicz 2021-02-19 16:50:10 UTC 
Created asterisk tracking bugs for this issue:

Affects: fedora-all [bug 1930872]
Comment 2 Product Security DevOps Team 2021-02-19 19:01:55 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.
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