[原文]rxvt-unicode before 6.3, on certain platforms that use openpty and non-Unix pty devices such as Linux and most BSD platforms, does not maintain the intended permissions of tty devices, which allows local users to gain read and write access to the devices.
rxvt-unicode contains a flaw that may allow an unauthorised malicious user to read from or write to tty terminal devices. The issue is present because on systems with non-unix pseudo terminals, permissions were not updated correctly. This left them as world-writable and world-readable, resulting in a loss of confidentiality and integrity.
Upgrade to version 6.3 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.