restbed through 5.0.0 accepts WebSocket frames with declared payload lengths up to 2^63 bytes and buffers the payload without size limits in an unbounded stream buffer. Remote unauthenticated attackers can declare large frame sizes and stream payload data to exhaust server memory, causing denial of service through process crash.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/Corvusoft/restbed
disclosure@vulncheck.com
https://github.com/Corvusoft/restbed/blob/e1227a297ce6d4e9f78222456507b29bb8ab7…
disclosure@vulncheck.com
https://github.com/Corvusoft/restbed/issues/558
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/restbed-through-5.0.0-websocket-memory-exh…
disclosure@vulncheck.com