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Ubuntu 18.04 LTS: USN-4504-1 Moderate: OpenSSL Remote Attack Fixes

ubuntu
Calendar Grey September 16, 2020
Dist Ubuntu Esm H88
Ubuntu's OpenSSL security advisory reveals critical vulnerabilities in its encryption framework impacting LTS versions. Users need to urgently update to mitigate risks
Several security issues were fixed in OpenSSL.

Summary

Several security issues were fixed in OpenSSL.

Software Description:

- openssl1.0: Secure Socket Layer (SSL) cryptographic library and tools

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

Details:

Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky

discovered that certain Diffie-Hellman ciphersuites in the TLS

specification and implemented by OpenSSL contained a flaw. A remote

attacker could possibly use this issue to eavesdrop on encrypted

communications. This was fixed in this update by removing the insecure

ciphersuites from OpenSSL. (CVE-2020-1968)

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. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1547)

Guido Vranken disco...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory remote attack ubuntu openssl eavesdropping

Update Instructions

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

Ubuntu 18.04 LTS:
  libssl1.0.0                     1.0.2n-1ubuntu5.4

Ubuntu 16.04 LTS:
  libssl1.0.0                     1.0.2g-1ubuntu4.17

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

References

https://ubuntu.com/security/notices/USN-4504-1

CVE-2019-1547, CVE-2019-1551, CVE-2019-1563, CVE-2020-1968

September 16, 2020

Topics%20covered

Topics Covered

security advisory remote attack ubuntu openssl eavesdropping

Package Information

https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.4
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.17

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