Уязвимость реализации механизма HMAC-SHA-256 криптографической библиотеки GnuTLS, позволяющая нарушителю осуществить атаку типа «Lucky 13» и атаку с восстановлением открытого текста

Уязвимость реализации механизма HMAC-SHA-384 криптографической библиотеки GnuTLS, позволяющая нарушителю осуществить атаку типа «Lucky 13» и атаку с восстановлением открытого текста

It was found that the GnuTLS implementation of HMAC-SHA-256 was vulnerable to a Lucky thirteen style attack. Remote attackers could use this flaw to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data using crafted packets.

It was found that the GnuTLS implementation of HMAC-SHA-384 was vulnerable to a Lucky thirteen style attack. Remote attackers could use this flaw to conduct distinguishing attacks and plain text recovery attacks via statistical analysis of timing data using crafted packets.

A cache-based side channel in GnuTLS implementation that leads to plain text recovery in cross-VM attack setting was found. An attacker could use a combination of "Just in Time" Prime+probe attack in combination with Lucky-13 attack to recover plain text using crafted packets.