Screen: UTF-8 character handling vulnerability
Gentoo Linux Security Advisory
||GLSA 200611-01 / screen
||November 03, 2006
||November 03, 2006: 01
All supported architectures
Screen contains an error in its UTF-8 character handling code that would
allow a remote Denial of Service or possibly the remote execution of
Screen is a full-screen window manager that multiplexes a physical
terminal between several processes, typically interactive shells.
cstone and Richard Felker discovered a flaw in Screen's UTF-8 combining
The vulnerability can be exploited by writing a special string of
characters to a Screen window. A remote attacker could cause a Denial
of Service or possibly execute arbitrary code with the privileges of
the user running Screen through a program being run inside a Screen
session, such as an IRC client or a mail client.
There is no known workaround at this time.
All Screen users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-misc/screen-4.0.3"