websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.

Affected: RubyGems: websocket-extensions

### Impact

The ReDoS flaw allows an attacker to exhaust the server's capacity to process incoming requests by sending a WebSocket handshake request containing a header of the following form:

Sec-WebSocket-Extensions: a; b="\c\c\c\c\c\c\c\c\c\c ...

That is, a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. The parser takes exponential time to reject this header as invalid, and this will block the processing of any other work on the same thread. Thus if you are running a single-threaded server, such a request can render your service completely unavailable.

### Patches

Users should upgrade to version 0.1.5.

### Workarounds

There are no known work-arounds other than disabling any public-facing WebSocket functionality you are operating.

### References

- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions/

Affected: openEuler:20.03-LTS-SP1: rubygem-websocket-extensions, openEuler:20.03-LTS-SP2: rubygem-websocket-extensions, openEuler:20.03-LTS-SP3: rubygem-websocket-extensions

Generic extension manager for WebSocket connections. Security Fix(es): websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.(CVE-2020-7663)

ruby2.7-rubygem-websocket-extensions-0.1.5-1.7 on GA media

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Security update for rubygem-websocket-extensions

Affected: Ubuntu:16.04:LTS: ruby-websocket-extensions, Ubuntu:18.04:LTS: ruby-websocket-extensions, Ubuntu:20.04:LTS: ruby-websocket-extensions

websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in GitLab ausnutzen, um einen Cross-Site Scripting oder Denial of Service Angriff durchzuführen, Sicherheitsmechanismen zu umgehen, Daten zu manipulieren oder vertrauliche Daten einzusehen.