Exploit/Advisories

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Ubuntu Security Notice USN-4502-1
September 16, 2020

ruby-websocket-extensions vulnerability
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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

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

References:
https://usn.ubuntu.com/4502-1
CVE-2020-7663

Package Information:

https://launchpad.net/ubuntu/+source/ruby-websocket-extensions/0.1.2-1+deb9u1build0.20.04.1

https://launchpad.net/ubuntu/+source/ruby-websocket-extensions/0.1.2-1+deb9u1build0.18.04.1

https://launchpad.net/ubuntu/+source/ruby-websocket-extensions/0.1.2-1+deb9u1build0.16.04.1

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