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Vigil@nce - GNOME vte: denial of service via insert-blank-characters

July 2011 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can invite the victim to display a text document with
gnome-terminal (GNOME vte), in order to create a denial of service.

Severity: 1/4

Creation date: 13/07/2011

IMPACTED PRODUCTS

 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The gnome-terminal terminal uses the GNOME vte (Virtual Terminal
Emulation) library (widget).

A terminal support ANSI sequences, which are used to alter the
display:

 ^[ line; column H : move to the (line,column) screen coordinates
 ^[ num A : go up of num lines
 ^[ num @ : insert num spaces ("insert-blank-characters")
 etc.

However, vte does not limit the number of spaces which can be
inserted with "insert-blank-characters". The terminal thus
consumes a lot a resources to display the spaces.

An attacker can therefore invite the victim to display a text
document with gnome-terminal (GNOME vte), in order to create a
denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/GNOME-vte-denial-of-service-via-insert-blank-characters-10840


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