A vulnerability has been reported in MirBSD Korn Shell, which can be exploited by malicious, local users to gain escalated privileges.
The vulnerability is caused due to an error when attaching to a TTY via the "-T" command line switch. This can be exploited to execute arbitrary commands with the privileges of the user running mksh via characters previously written to the attached virtual console.
The vulnerability is reported in versions prior to R33d.
Solution: Update to version R33d.
Provided and/or discovered by: Reported by the vendor.
Original Advisory: http://www.mirbsd.org/mksh.htm#clog
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