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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.

Severity: 2/4.

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.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/C...




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