The SIMATIC CP 343-1 Advanced product allows configuration of the IKEv1 cipher suite configuration, which specifies the IKE and Encapsulating Security Payload (ESP) supported algorithms, with one cipher for each setting. It is evaluated that the configuration is not consistent with the supported ciphers that are eventually applied on the IPSec responder of the SIMATIC CP 343-1 Advanced. In fact, regardless of the selected choice for the ESP cipher, it is always possible for the IPSec client to propose, and successfully use, DES, 3DES, AES128 and AES256. This invalidates the potential desire to enforce a stronger cipher, as the client can always decide to use weaker. Siemens SIMATIC CP 343-1 Advanced tested with fw V3.0.44 is affected.
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