CVE-2002-20001
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of service disruption.
- Exploit odds
- 24.6% chance of exploitation in the next 30 days (EPSS). Higher than most.
- Fix
- No patch or advisory is linked yet. Look at mitigations or restrict exposure.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 24.6% in the next 30 days (EPSS).
- Severity: 7.5 HIGH (CVSS).
- Fix: none linked yet, which raises it.
Details
- Published
- Last modified
- Exploit probability
- 24.6% · EPSS, next 30 days
- Weakness
- CWE-400 · Uncontrolled resource consumption
- Record status
- Analyzed
Affected
- Balasys Dheater
- Siemens Scalance w1750d Firmware
- Suse Linux Enterprise Server 11
- Suse Linux Enterprise Server 12
- Suse Linux Enterprise Server 15
- f5 big-ip Access Policy Manager < 16.1.4
- f5 big-ip Access Policy Manager < 17.1.0
- f5 big-ip Advanced Firewall Manager ≤ 17.1.2
Attack profile CVSS 3.1 · 7.5
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2002-20001.md and follow it. Check whether this project is affected by CVE-2002-20001. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-506569.pdf
- https://dheatattack.com
- https://dheatattack.gitlab.io/
- https://github.com/Balasys/dheater
- https://github.com/mozilla/ssl-config-generator/issues/162
- https://gitlab.com/dheatattack/dheater
- https://ieeexplore.ieee.org/document/10374117
- https://support.f5.com/csp/article/K83120834
- https://www.arubanetworks.com/assets/alert/ARUBA-PSA-2022-004.txt
- https://www.openssl.org/blog/blog/2022/10/21/tls-groups-configuration/
- https://www.reddit.com/r/netsec/comments/qdoosy/server_overload_by_enforcing_dhe_key_exchange/
- https://www.researchgate.net/profile/Anton-Stiglic-2/publication/2401745_Security_Issues_in_the_Diffie-Hellman_Key_Agreement_Protocol
- https://www.suse.com/support/kb/doc/?id=000020510
- https://cert-portal.siemens.com/productcert/pdf/ssa-506569.pdf
- https://dheatattack.com
- https://dheatattack.gitlab.io/
- https://github.com/Balasys/dheater
- https://github.com/mozilla/ssl-config-generator/issues/162
- https://gitlab.com/dheatattack/dheater
- https://ieeexplore.ieee.org/document/10374117
- https://support.f5.com/csp/article/K83120834
- https://www.arubanetworks.com/assets/alert/ARUBA-PSA-2022-004.txt
- https://www.openssl.org/blog/blog/2022/10/21/tls-groups-configuration/
- https://www.reddit.com/r/netsec/comments/qdoosy/server_overload_by_enforcing_dhe_key_exchange/
- https://www.researchgate.net/profile/Anton-Stiglic-2/publication/2401745_Security_Issues_in_the_Diffie-Hellman_Key_Agreement_Protocol