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Ubuntu: 4376-1 Moderate: OpenSSL Timing Attack and RNG Issues

ubuntu
Calendar Grey May 28, 2020
Dist Ubuntu Esm H88
=========================================================================Ubuntu Security Notice USN-
Several security issues were fixed in OpenSSL.

Summary

Several security issues were fixed in OpenSSL.

Software Description:

- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

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. (CV...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory remote exploit timing attack ubuntu openssl padding oracle RNG issue

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 19.10:
  libssl1.1                       1.1.1c-1ubuntu4.1

Ubuntu 18.04 LTS:
  libssl1.1                       1.1.1-1ubuntu2.1~18.04.6

Ubuntu 16.04 LTS:
  libssl1.0.0                     1.0.2g-1ubuntu4.16

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4376-1

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

Severity
important
Lowest
Low
Medium
High
Critical

May 28, 2020

Topics%20covered

Topics Covered

security advisory remote exploit timing attack ubuntu openssl padding oracle RNG issue

Package Information

https://launchpad.net/ubuntu/+source/openssl/1.1.1c-1ubuntu4.1
https://launchpad.net/ubuntu/+source/openssl/1.1.1-1ubuntu2.1~18.04.6
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.16

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