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Vulnerability of Linux kernel: information disclosure about keyboard

Synthesis of the vulnerability 

A local attacker can read files of /proc or /dev, in order to obtain information about keys pressed by other users.
Vulnerable software: Linux.
Severity of this announce: 1/4.
Number of vulnerabilities in this bulletin: 3.
Creation date: 08/11/2011.
Références of this computer vulnerability: BID-50573, CVE-2011-4915, CVE-2011-4916, CVE-2011-4917, VIGILANCE-VUL-11131.

Description of the vulnerability 

Three vulnerabilities can be used by a local attacker to obtain information on pressed keys.

An attacker can read the number of keybord interruptions indicated in /proc/interrupts, in order to guess the number of pressed keys. [severity:1/4; BID-50573, CVE-2011-4915, CVE-2011-4917]

An attacker can monitor the changing time of /dev/pts/ and /dev/tty*, in order to guess the number of pressed keys. [severity:1/4; CVE-2011-4916]

An attacker can read the number of Scheduler events indicated in /proc/$PID/sched, in order to guess the number of pressed keys. [severity:1/4]

A local attacker can therefore read files of /proc or /dev, in order to obtain information about keys pressed by other users.
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This security vulnerability impacts software or systems such as Linux.

Our Vigil@nce team determined that the severity of this computer weakness bulletin is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

This bulletin is about 3 vulnerabilities.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a beginner ability can exploit this security note.

Solutions for this threat 

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