It was discovered that Libgcrypt is prone to a local side-channel attack allowing recovery of ECDSA private keys. For the stable distribution (stretch), this problem has been fixed in

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Debian Security Advisory DSA-4231-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
June 17, 2018                         https://www.debian.org/security/faq
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Package        : libgcrypt20
CVE ID         : CVE-2018-0495

It was discovered that Libgcrypt is prone to a local side-channel attack
allowing recovery of ECDSA private keys.

For the stable distribution (stretch), this problem has been fixed in
version 1.7.6-2+deb9u3.

We recommend that you upgrade your libgcrypt20 packages.

For the detailed security status of libgcrypt20 please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/libgcrypt20

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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