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USN-5064-1: GNU cpio vulnerability

8 September 2021

GNU cpio could be made to crash or run programs if it opened a specially crafted file.



  • cpio - a tool to manage archives of files


Maverick Chung and Qiaoyi Fang discovered that cpio incorrectly handled
certain pattern files. A remote attacker could use this issue to cause cpio
to crash, resulting in a denial of service, or possibly execute arbitrary

Update instructions

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

Ubuntu 21.04
Ubuntu 20.04
Ubuntu 18.04

In general, a standard system update will make all the necessary changes.


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