USN-4891-1: OpenSSL vulnerability

25 March 2021

OpenSSL could be made to crash if it received specially crafted network traffic.



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


It was discovered that OpenSSL incorrectly handled certain renegotiation
ClientHello messages. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service.

Update instructions

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

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04

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


Related notices

  • USN-5038-1: libpq-dev, libpgtypes3, postgresql-12, postgresql-doc-12, postgresql-client-10, postgresql-13, postgresql-server-dev-10, postgresql-plpython3-10, postgresql-client-12, libecpg-compat3, postgresql-10, postgresql-plpython3-12, postgresql-client-13, postgresql-pltcl-10, postgresql-pltcl-12, postgresql-plpython-10, postgresql-plpython3-13, postgresql-server-dev-13, libecpg6, postgresql-server-dev-12, libecpg-dev, postgresql-pltcl-13, postgresql-plperl-10, libpq5, postgresql-plperl-13, postgresql-plperl-12, postgresql-doc-10, postgresql-doc-13