Ubuntu Security Notice 3733-2 - USN-3733-1 fixed a vulnerability in GnuPG. This update provides the corresponding update for Ubuntu 12.04 ESM. Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal, and Yuval Yarom discovered that GnuPG is vulnerable to a cache side- channel attack. A local attacker could use this attack to recover RSA private keys. Various other issues were also addressed.
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Ubuntu Security Notice USN-3733-2
August 15, 2018
gnupg vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 ESM
Summary:
GnuPG could be made to expose sensitive information.
Software Description:
- gnupg: GNU privacy guard - a free PGP replacement
Details:
USN-3733-1 fixed a vulnerability in GnuPG. This update provides
the corresponding update for Ubuntu 12.04 ESM.
Original advisory details:
Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot
Bruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal,
and Yuval Yarom discovered that GnuPG is vulnerable to a cache side-
channel attack. A local attacker could use this attack to recover RSA
private keys.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 12.04 ESM:
gnupg 1.4.11-3ubuntu2.12
gnupg-curl 1.4.11-3ubuntu2.12
gpgv 1.4.11-3ubuntu2.12
In general, a standard system update will make all the necessary
changes.
References:
https://usn.ubuntu.com/usn/usn-3733-2
https://usn.ubuntu.com/usn/usn-3733-1
CVE-2017-7526