Ubuntu Security Notice 3347-1 - Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal, and Yuval Yarom discovered that Libgcrypt was susceptible to an attack via side channels. A local attacker could use this attack to recover RSA private keys. It was discovered that Libgcrypt was susceptible to an attack via side channels. A local attacker could use this attack to possibly recover EdDSA private keys. This issue only applied to Ubuntu 16.04 LTS, Ubuntu 16.10 and Ubuntu 17.04. Various other issues were also addressed.
99f000f63d5c3d36e35cb45731868ca37158b8a5396e4620eddbafd6657a3cabDebian Linux Security Advisory 3880-1 - It was discovered that a side channel attack in the EdDSA session key handling in Libgcrypt may result in information disclosure.
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