Description
ws is an open source WebSocket client and server for Node.js. A request with a number of headers exceeding theserver.maxHeadersCount threshold could be used to crash a ws server. The vulnerability was fixed in ws@8.17.1 (e55e510) and backported to ws@7.5.10 (22c2876), ws@6.2.3 (eeb76d3), and ws@5.2.4 (4abd8f6). In vulnerable versions of ws, the issue can be mitigated in the following ways: 1. Reduce the maximum allowed length of the request headers using the --max-http-header-size=size and/or the maxHeaderSize options so that no more headers than the server.maxHeadersCount limit can be sent. 2. Set server.maxHeadersCount to 0 so that no limit is applied.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- websockets / ws>= 2.1.0, < 5.2.4 – >= 2.1.0, < 5.2.4
- websockets / ws>= 6.0.0, < 6.2.3 – >= 6.0.0, < 6.2.3
- websockets / ws>= 7.0.0, < 7.5.10 – >= 7.0.0, < 7.5.10
- websockets / ws>= 8.0.0, < 8.17.1 – >= 8.0.0, < 8.17.1
References
- VENDOR_ADVISORYhttps://github.com/websockets/ws/security/advisories/GHSA-3h5v-q93c-6h6q
- MISChttps://github.com/websockets/ws/issues/2230
- PATCHhttps://github.com/websockets/ws/pull/2231
- PATCHhttps://github.com/websockets/ws/commit/22c28763234aa75a7e1b76f5c01c181260d7917f
- PATCHhttps://github.com/websockets/ws/commit/4abd8f6de4b0b65ef80b3ff081989479ed93377e
- PATCHhttps://github.com/websockets/ws/commit/e55e5106f10fcbaac37cfa89759e4cc0d073a52c
- PATCHhttps://github.com/websockets/ws/commit/eeb76d313e2a00dd5247ca3597bba7877d064a63
- MISChttps://nodejs.org/api/http.html#servermaxheaderscount