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CVE-2024-41996 Validating the order of the public keys in the Diffie-Hellman Key Agreement Protocol, when an approved safe prime is…

Description

Validating the order of the public keys in the Diffie-Hellman Key Agreement Protocol, when an approved safe prime is used, allows remote attackers (from the client side) to trigger unnecessarily expensive server-side DHE modular-exponentiation calculations. The client may cause asymmetric resource consumption. 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 and validate the order of the public key.

Affected products and versions

Product Affected versions Fixed in
n/a Versions not published
diffie-hellman_key_exchange Versions not published
RUGGEDCOM RST2428P 3.3 earliest → < 3.3 3.3
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family 3.3 earliest → < 3.3 3.3
SCALANCE XCH328 3.3 earliest → < 3.3 3.3
SCALANCE XCM324 3.3 earliest → < 3.3 3.3
SCALANCE XCM328 3.3 earliest → < 3.3 3.3
SCALANCE XCM332 3.3 earliest → < 3.3 3.3
SCALANCE XRH334 (24 V DC, 8xFO, CC) 3.3 earliest → < 3.3 3.3
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Product Affected versions Fixed in
SCALANCE XRM334 (230 V AC, 12xFO) 3.3 earliest → < 3.3 3.3
SCALANCE XRM334 (230 V AC, 8xFO) 3.3 earliest → < 3.3 3.3
SCALANCE XRM334 (230V AC, 2x10G, 24xSFP, 8xSFP+) 3.3 earliest → < 3.3 3.3
SCALANCE XRM334 (24 V DC, 12xFO) 3.3 earliest → < 3.3 3.3
SCALANCE XRM334 (24 V DC, 8xFO) 3.3 earliest → < 3.3 3.3
SCALANCE XRM334 (24V DC, 2x10G, 24xSFP, 8xSFP+) 3.3 earliest → < 3.3 3.3
SCALANCE XRM334 (2x230 V AC, 12xFO) 3.3 earliest → < 3.3 3.3
SCALANCE XRM334 (2x230 V AC, 8xFO) 3.3 earliest → < 3.3 3.3
SCALANCE XRM334 (2x230V AC, 2x10G, 24xSFP, 8xSFP+) 3.3 earliest → < 3.3 3.3
SIDIS Prime 4.0 earliest → < 4.0.800 4.0.800
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem 1.1 earliest → < 1.1.1 1.1.1

References

Timeline

  1. Published
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