MirBSD Korn Shell TTY privilege escalation
| mirbsd-tty-privilege-escalation (41794) |  High Risk |
Description:
MirBSD Korn Shell could allow a local attacker to gain elevated privileges on the system, caused by an error during a TTY attachment. By using characters previously assigned to the attached virtual console to attach to a TTY, a local attacker could exploit this vulnerability to execute arbitrary commands on the system with the privileges of the victim running mksh.
Platforms Affected:
- MirOS, MirBSD Korn Shell prior to R33d
Remedy:
Upgrade to the latest version of MirBSD Korn Shell (R33d or later), available from the MirBSD Web site. See References.
Consequences:
Gain Privileges
References:
- MirBSD Web site, Recent Changes, mksh R33d at http://www.mirbsd.org/mksh.htm#clog.
- BID-28768: MirBSD Korn Shell Local Privilege Escalation Vulnerability
- CVE-2008-1845: 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.
- SA29803: MirBSD Korn Shell TTY Attachment Privilege Escalation
Reported:
Apr 14, 2008
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