Eran Tromer

The issue makes it easier for physically proximate attackers to extract ECDH keys by measuring electromagnetic emanations due to improper elliptic-point curve multiplication during decryption.

The issue concerns the improper performance of ciphertext normalization and ciphertext randomization in libgcrypt, which can be exploited by physically proximate attackers to conduct key-extraction attacks. This is achieved by collecting voltage data from exposed metal, representing a different attack vector. The vulnerability can lead to a breach of confidentiality of protected information and can be exploited locally.

The issue allows attackers to extract RSA keys via a chosen-ciphertext attack and acoustic cryptanalysis during decryption. This can be exploited remotely and may lead to a violation of the confidentiality and integrity of protected information. The vulnerability is related to the generation of RSA keys using sequences of introductions with certain patterns, which introduces a side channel.