[USN-4376-1] OpenSSL vulnerabilities

---------- Forwarded message ---------

From: Marc Deslauriers <marc.deslauriers@canonical.com>

Date: May 28, 2020 9:23PM

Cesar Pereida García, Sohaib ul Hassan, Nicola Tuveri, Iaroslav Gridin,

Alejandro Cabrera Aldaya, and Billy Brumley discovered that OpenSSL

incorrectly handled ECDSA signatures. An attacker could possibly use this

issue to perform a timing side-channel attack and recover private ECDSA

keys. (CVE-2019-1547)

Matt Caswell discovered that OpenSSL incorrectly handled the random number

generator (RNG). This may result in applications that use the fork() system

call sharing the same RNG state between the parent and the child, contrary

to expectations. This issue only affected Ubuntu 18.04 LTS and Ubuntu

19.10. (CVE-2019-1549)

Guido Vranken discovered that OpenSSL incorrectly performed the x86_64

Montgomery squaring procedure. While unlikely, a remote attacker could

possibly use this issue to recover private keys. (CVE-2019-1551)

Bernd Edlinger discovered that OpenSSL incorrectly handled certain

decryption functions. In certain scenarios, a remote attacker could

possibly use this issue to perform a padding oracle attack and decrypt

traffic. (CVE-2019-1563)

References:

  https://usn.ubuntu.com/4376-1

  CVE-2019-1547, CVE-2019-1549, CVE-2019-1551, CVE-2019-1563