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Ubuntu Security Notice USN-4690-1
January 11, 2021

coturn vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

coTURN could be made to crash or run programs if it received
specially crafted network traffic.

Software Description:
- coturn: TURN and STUN server for VoIP

Details:

It was discovered that coTURN allowed peers to connect and relay packets to
loopback addresses in the range of 127.x.x.x. A malicious user could use this
vulnerability to insert packages into the loopback interface.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
  coturn                          4.5.1.3-1ubuntu0.1

Ubuntu 20.04 LTS:
  coturn                          4.5.1.1-1.1ubuntu0.20.04.2

Ubuntu 18.04 LTS:
  coturn                          4.5.0.7-1ubuntu2.18.04.3

Ubuntu 16.04 LTS:
  coturn                          4.5.0.3-1ubuntu0.4

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4690-1
  CVE-2020-26262

Package Information:
  https://launchpad.net/ubuntu/+source/coturn/4.5.1.3-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/coturn/4.5.1.1-1.1ubuntu0.20.04.2
  https://launchpad.net/ubuntu/+source/coturn/4.5.0.7-1ubuntu2.18.04.3
  https://launchpad.net/ubuntu/+source/coturn/4.5.0.3-1ubuntu0.4