Vigil@nce - Cisco IOS: privilege escalation via TCL
August 2015 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can attach himself to the pseudo-terminal of a terminating TCL script in of Cisco IOS, in order to get administrator privileges.
Impacted products: Cisco Catalyst, IOS Cisco, Cisco Router.
Creation date: 15/06/2015.
DESCRIPTION OF THE VULNERABILITY
The Cisco IOS product includes a TCL interpreter.
TCL scripts are connected to a pseudo-terminal, for I/O with the end user. However, when a script terminates, the privileges associated to the pseudo-terminal are not suitably reset. So an attacker who can attach a process of him to this pseudo-terminal would be able to run administration commands.
An attacker can therefore attach himself to the pseudo-terminal of a terminating TCL script in of Cisco IOS, in order to get administrator privileges.
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