ruby-websocket-extensions vulnerability

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

* Ubuntu 20.04 LTS
* Ubuntu 18.04 LTS
* Ubuntu 16.04 LTS

Summary

websocket-extensions could be made to exhaust the server's
capacity to process incoming requests if it received specially
crafted requests.

Software Description

* ruby-websocket-extensions - Generic extension manager for
WebSocket connections

Details

It was discovered that websocket-extensions does not properly
parse special headers. A remote attacker could use this issue to
cause regex backtracking, resulting in a denial of service.
(CVE-2020-7663)

Update instructions

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

Ubuntu 20.04 LTS
ruby-websocket-extensions - 0.1.2-1+deb9u1build0.20.04.1

Ubuntu 18.04 LTS
ruby-websocket-extensions - 0.1.2-1+deb9u1build0.18.04.1

Ubuntu 16.04 LTS
ruby-websocket-extensions - 0.1.2-1+deb9u1build0.16.04.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

* CVE-2020-7663

--- Mystic BBS v1.12 A45 (Linux/64)
* Origin: BZ&BZ BBS (21:4/110)