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AUSCERT External Security Bulletin Redistribution
ESB-2020.3168
USN-4502-1: websocket-extensions vulnerability
17 September 2020
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AusCERT Security Bulletin Summary
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Product: ruby-websocket-extensions
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7663
Reference: ESB-2020.2867
Original Bulletin:
https://usn.ubuntu.com/4502-1/
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USN-4502-1: websocket-extensions vulnerability
16 September 2020
websocket-extensions could be made to exhaust the server's capacity to
process incoming requests if it received specially crafted requests.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o 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
o ruby-websocket-extensions - 0.1.2-1+deb9u1build0.20.04.1
Ubuntu 18.04
o ruby-websocket-extensions - 0.1.2-1+deb9u1build0.18.04.1
Ubuntu 16.04
o ruby-websocket-extensions - 0.1.2-1+deb9u1build0.16.04.1
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-7663
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