CVE-2002-20001

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)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.

CVSS v3.0 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://github.com/Balasys/dheater	Third Party Advisory
https://www.researchgate.net/profile/Anton-Stiglic-2/publication/2401745_Security_Issues_in_the_Diffie-Hellman_Key_Agreement_Protocol	Exploit Third Party Advisory
https://github.com/mozilla/ssl-config-generator/issues/162	Third Party Advisory
https://www.reddit.com/r/netsec/comments/qdoosy/server_overload_by_enforcing_dhe_key_exchange/	Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-506569.pdf
https://support.f5.com/csp/article/K83120834
https://www.openssl.org/blog/blog/2022/10/21/tls-groups-configuration/
https://www.suse.com/support/kb/doc/?id=000020510
https://dheatattack.com
https://www.arubanetworks.com/assets/alert/ARUBA-PSA-2022-004.txt

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Configurations

Configuration 1 (hide)

cpe:2.3:a:balasys:dheater:-:*:*:*:*:*:*:*

Information

Published : 2021-11-11 11:15

Updated : 2022-11-09 10:15

NVD link : CVE-2002-20001

Mitre link : CVE-2002-20001

JSON object : View

CWE

CWE-400

Uncontrolled Resource Consumption

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Products Affected

balasys

dheater

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