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USN-5355-1: zlib vulnerability

30 March 2022

zlib could be made to crash or run programs if it received specially crafted input.



  • zlib - Lossless data-compression library


Danilo Ramos discovered that zlib incorrectly handled memory when
performing certain deflating operations. An attacker could use this issue
to cause zlib to crash, resulting in a denial of service, or possibly
execute arbitrary code.

Update instructions

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

Ubuntu 21.10
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-5355-2: zlib, lib32z1, libx32z1, lib64z1-dev, zlib-bin, zlib1g-dev, lib32z1-dev, zlib1g, lib64z1, libx32z1-dev
  • USN-5359-1: rsync
  • USN-5359-2: rsync
  • USN-5739-1: mariadb-backup, mariadb-plugin-oqgraph, libmariadb-dev, mariadb-10.3, mariadb-client-core-10.3, mariadb-test, libmariadbd19, mariadb-server-10.3, mariadb-client, mariadb-server, mariadb-plugin-spider, mariadb-plugin-mroonga, libmariadbclient-dev, mariadb-common, mariadb-plugin-connect, mariadb-server-core-10.6, mariadb-plugin-cracklib-password-check, mariadb-10.6, mariadb-plugin-gssapi-server, mariadb-plugin-tokudb, mariadb-server-10.6, mariadb-test-data, libmariadb3, mariadb-server-core-10.3, mariadb-plugin-gssapi-client, mariadb-client-10.6, libmariadb-dev-compat, mariadb-client-core-10.6, mariadb-plugin-rocksdb, mariadb-plugin-s3, mariadb-client-10.3, libmariadbd-dev