Description
Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.
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
- Go standard library / crypto/tls0 – 1.25.13
- Go standard library / crypto/tls1.26.0-0 – 1.26.6
- Go standard library / crypto/tls1.27.0-0 – 1.27.0-rc.3
Updated 23m ago · 8 sources