An asterisk security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: asterisk-17.9.0-1.fc33

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Fedora Update Notification
FEDORA-2020-6b277646c7
2020-11-28 02:02:44.954935
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Name : asterisk
Product : Fedora 33
Version : 17.9.0
Release : 1.fc33
URL :   http://www.asterisk.org/
Summary : The Open Source PBX
Description :
Asterisk is a complete PBX in software. It runs on Linux and provides
all of the features you would expect from a PBX and more. Asterisk
does voice over IP in three protocols, and can interoperate with
almost all standards-based telephony equipment using relatively
inexpensive hardware.

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Update Information:

Update to upstream 17.9.0 for bug and security fixes
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ChangeLog:

* Thu Nov 19 2020 Jared K. Smith - 17.9.0-1
- Update to upstream 17.9.0 for bug fixes
* Mon Nov 9 2020 Jared K. Smith - 17.8.1-1
- Update to upstream 17.8.1 release for security fixes AST-2020-001 and
AST-2020-002
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References:

[ 1 ] Bug #1895395 - CVE-2020-28242 asterisk: outbound INVITE loop on challenge with different nonce
  https://bugzilla.redhat.com/show_bug.cgi?id=1895395
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-6b277646c7' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys