Ubuntu Security Notice USN-5051-2

Ubuntu Security Notice USN-5051-2
August 26, 2021

openssl vulnerability
A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 16.04 ESM
– Ubuntu 14.04 ESM


OpenSSL could be made to crash or expose sensitive information
if it received a specially crafted ASN.1 string.

Software Description:
– openssl: Secure Socket Layer (SSL) cryptographic library and tools


USN-5051-1 fixed a vulnerability in OpenSSL. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Ingo Schwarze discovered that OpenSSL incorrectly handled certain ASN.1
strings. A remote attacker could use this issue to cause OpenSSL to crash,
resulting in a denial of service, or possibly obtain sensitive information.

Update instructions:

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

Ubuntu 16.04 ESM:
libssl1.0.0 1.0.2g-1ubuntu4.20+esm1

Ubuntu 14.04 ESM:
libssl1.0.0 1.0.1f-1ubuntu2.27+esm3

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