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Debian LTS: Security Advisory for ruby-websocket-extensions (DLA-2334-1)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update for the 'ruby-websocket-extensions' package(s) announced via the DLA-2334-1 advisory.
Insight
Insight
It was discovered that there was a denial of service vulnerability in ruby-websocket-extensions, a library for managing long-lived HTTP 'WebSocket' connections. The parser took quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence. This could be abused by an attacker to conduct a Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload in the Sec-WebSocket-Extensions HTTP header.
Affected Software
Affected Software
'ruby-websocket-extensions' package(s) on Debian Linux.
Detection Method
Detection Method
Checks if a vulnerable package version is present on the target host.
Solution
Solution
For Debian 9 'Stretch', this problem has been fixed in version 0.1.2-1+deb9u1. We recommend that you upgrade your ruby-websocket-extensions packages.