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CVE-2020-7663

Published: 2 June 2020

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
ruby-websocket-extensions
Launchpad, Ubuntu, Debian
bionic
Released (0.1.2-1+deb9u1build0.18.04.1)
eoan Ignored
(end of life)
focal
Released (0.1.2-1+deb9u1build0.20.04.1)
groovy Ignored
(end of life)
hirsute Not vulnerable
(0.1.5-1)
impish Not vulnerable
(0.1.5-1)
jammy Not vulnerable
(0.1.5-1)
trusty Does not exist

upstream Needs triage

xenial
Released (0.1.2-1+deb9u1build0.16.04.1)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H