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USN-5051-3: OpenSSL vulnerability

26 August 2021

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



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


USN-5051-1 fixed a vulnerability in OpenSSL. This update provides the
corresponding update for the openssl1.0 package in Ubuntu 18.04 LTS.

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 18.04

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


Related notices

  • USN-5051-1: openssl, libssl1.1, libssl-doc, libssl-dev
  • USN-5051-2: openssl, libssl-doc, libssl1.0.0, libssl-dev
  • USN-5088-1: qemu-efi-aarch64, ovmf, qemu-efi, edk2, ovmf-ia32, qemu-efi-arm