Vigil@nce - Linux kernel: information disclosure via USB proc_connectinfo
May 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can read a memory fragment of USB
proc_connectinfo() of the Linux kernel, in order to obtain
sensitive information.
– Impacted products: Fedora, Linux.
– Severity: 1/4.
– Creation date: 04/05/2016.
DESCRIPTION OF THE VULNERABILITY
The Linux kernel implements usbfs, which uses the
usbdevfs_connectinfo structure.
However, the proc_connectinfo() function of the
drivers/usb/core/devio.c file does not initialize a memory area of
3 bytes before returning it to the user.
A local attacker can therefore read a memory fragment of USB
proc_connectinfo() of the Linux kernel, in order to obtain
sensitive information.
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