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