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 arbitrary code.
|Package||app-misc/screen on all architectures|
|Affected versions||< 4.0.3|
|Unaffected versions||>= 4.0.3|
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 character handling.
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:
# emerge --sync # emerge --ask --oneshot --verbose ">=app-misc/screen-4.0.3"
November 03, 2006
November 03, 2006: 01