GNU Screen: User-assisted execution of arbitrary code

GNU Screen: User-assisted execution of arbitrary code A vulnerability in GNU screen may allow a remote attacker to execute arbitrary code. screen 2021-05-26 2021-05-26 769770 local, remote 4.8.0-r2 4.8.0-r2

GNU Screen is a full-screen window manager that multiplexes a physical terminal between several processes, typically interactive shells.

It was discovered that GNU screen did not properly handle certain UTF-8 character sequences.

A remote attacker could entice a user to run a program where attacker controls the output inside a GNU screen session, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.

This vulnerability can be mitigated by disabling UTF-8 processing in .screenrc.

All GNU screen users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=app-misc/screen-4.8.0-r2"

CVE-2021-26937 whissi whissi