The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the...
Vulnerability Description
The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, aka a D(HE)at or D(HE)ater attack. The client needs very little CPU resources and network bandwidth. The attack may be more disruptive in cases where a client can require a server to select its largest supported key size. The basic attack scenario is that the client must claim that it can only communicate with DHE, and the server must be configured to allow DHE.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://github.com/Balasys/dheater
- https://www.researchgate.net/profile/Anton-Stiglic-2/publication/2401745_Security_Issues_in_the_Diffie-Hellman_Key_Agreement_Protocol
- https://www.reddit.com/r/netsec/comments/qdoosy/server_overload_by_enforcing_dhe_key_exchange/
- https://github.com/mozilla/ssl-config-generator/issues/162
- https://cert-portal.siemens.com/productcert/pdf/ssa-506569.pdf
- https://www.suse.com/support/kb/doc/?id=000020510
- https://www.openssl.org/blog/blog/2022/10/21/tls-groups-configuration/
- https://www.arubanetworks.com/assets/alert/ARUBA-PSA-2022-004.txt
- https://support.f5.com/csp/article/K83120834
- https://dheatattack.com
- https://gitlab.com/dheatattack/dheater
- https://dheatattack.gitlab.io/
- https://ieeexplore.ieee.org/document/10374117
Affected Vendor
balasys
View all reports →Affected Software
Timeline
CVSS Vectors
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.