TITLE:
Linux Kernel Console Keyboard Mapping Shell Command Injection

SECUNIA ADVISORY ID:
SA17226

VERIFY ADVISORY:
http://secunia.com/advisories/17226/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
Rudolf Polzer has reported a vulnerability in the Linux Kernel, which
potentially can be exploited by malicious, local users to gain
escalated privileges.

The vulnerability is caused due to the way console keyboard mapping
is handled. The keyboard map installed by a local user using
"loadkeys" is applied to all virtual consoles and is not being reset
after the user logs out. 

Successful exploitation allows malicious console users to inject
arbitrary shell commands into certain key mappings, which are
executed when the next logon console user uses the re-mapped key.

The vulnerability has been reported in Kernel 2.6. Other versions may
also be affected.

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Rudolf Polzer

ORIGINAL ADVISORY:
Debian:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=334113

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