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Vigil@nce - Linux kernel: privilege not lost via chown

January 2015 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker, who inherits via chown() of a file previously
belonging to another user, obtains a file which potentially still
has privileged attributes.

Impacted products: Linux

Severity: 1/4

Creation date: 19/01/2015

DESCRIPTION OF THE VULNERABILITY

The chown() function changes the owner of a file.

This function also resets the suid and sgid bits. However, the
capabilities (setcap) and extended attributes are not reset.

An attacker, who inherits via chown() of a file previously
belonging to another user, therefore obtains a file which
potentially still has privileged attributes.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-privilege-not-lost-via-chown-15997


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