CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
60.0%
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.
Users should upgrade to version 0.1.4.
There are no known work-arounds other than disabling any public-facing
WebSocket functionality you are operating.
Vendor | Product | Version | CPE |
---|---|---|---|
websocket-extensions_project | websocket-extensions | * | cpe:2.3:a:websocket-extensions_project:websocket-extensions:*:*:*:*:*:ruby:*:* |
blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
github.com/advisories/GHSA-g78m-2chm-r7qv
github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237
github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv
nvd.nist.gov/vuln/detail/CVE-2020-7662
snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
60.0%