Description

The Korn shell (aka mksh) before R33d on MirOS (aka MirBSD) does not flush the tty's I/O when invoking mksh in a new terminal, which allows local users to gain privileges by opening a virtual terminal and entering command sequences, which might later be executed in opportunistic circumstances by a different user who launches mksh and specifies that terminal with the -T option.

Affected Products 3

References 5

• secunia.com http://secunia.com/advisories/29803
  Vendor Advisory
• mirbsd.org http://www.mirbsd.org/mksh.htm#clog
• osvdb.org http://www.osvdb.org/44365
• securityfocus.com http://www.securityfocus.com/bid/28768
• exchange.xforce.ibmcloud.com https://exchange.xforce.ibmcloud.com/vulnerabilities/41794

Remediation