Ubuntu Security Notice 2555-1 – Daniel Genkin, Lev Pachmanov, Itamar Pipman, and Eran Tromer discovered that Libgcrypt was susceptible to an attack via physical side channels. A local attacker could use this attack to possibly recover private keys. Daniel Genkin, Adi Shamir, and Eran Tromer discovered that Libgcrypt was susceptible to an attack via physical side channels. A local attacker could use this attack to possibly recover private keys. Various other issues were also addressed.