To establish this difference, attack-generated ciphertexts are sent to the same place in the plaintext stream during several TLS sessions. Transport Layer Security messages with two bytes of padding are processed somewhat faster, and this difference can be detected when the arrival of TLS error messages is timed. In a nutshell, this attack relies on a difference in processing times between TLS messages with at least two bytes of correct padding and TLS messages with one byte of correct padding (or incorrectly formatted padding). SSL LUCKY13 Security Assessment LevelĬVSS Vector: AV:N/AC:H/AU:N/C:P/I:N/A:N How Does an SSL LUCKY 13 Attack Occur? This can result in the loss of sensitive information. In the latter case, an attacker can recover up to 4 bits of the last byte of plaintext blocks.Īs a result of a successful attack, an attacker exploiting this vulnerability is able to read the plaintext of a TLS encrypted session. ![]() Under OpenSSL, the attack allows a full plaintext recovery, whereas, for GnuTLS, a partial plaintext recovery attack can be conducted. The attack can be considered a more advanced type of padding oracle attack that exploits different calculation times depending on the plaintext being padded with one or two bytes or containing incorrect padding. The vulnerability that allows the SSL LUCKY 13 to be made is due to a flaw in the SSL/TLS specification rather than due to issues in specific implementations. It is called LUCKY 13 due to the 13 bytes of the header information in the TLS MAC calculation that is part of the vulnerability and makes the attack possible. The possibility of the LUCKY 13 attack was established by security researchers Nadhem AlFardan and Kenny Paterson. It also affects previous versions such as SSL 3.0 and TLS 1.0. The vulnerability that makes the SSL LUCKY 13 possible affects the TLS 1.1 and 1.2 and DTLS 1.0 or 1.2 implementations. The ТLS protocol, the successor of the Secure Sockets Layer (SSL) protocol, provides privacy, data integrity, and secure traffic between communicating networks or applications. This can also be considered a type of man-in-the-middle attack. The SSL LUCKY13 is a cryptographic timing attack that can be used against implementations of the Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) protocols using the Cipher Block Chaining (CBC) mode of operation.
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