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Vigil@nce - Linux kernel: NULL pointer dereference via slhc_init

October 2015 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker can force a NULL pointer to be dereferenced in the slhc_init() function of the Linux kernel, in order to trigger a denial of service.

- Impacted products: Linux.
- Severity: 1/4.
- Creation date: 12/10/2015.

DESCRIPTION OF THE VULNERABILITY

The Linux kernel implements the PPPIOCSMAXCID ioctl, which defines the maximal size of entries for PPP compression.

This ioctl calls the slhc_init() function of the drivers/net/slip/slhc.c file. However, if the size is too large, the comp->tstate pointer becomes NULL, and this function does not check if this pointer is NULL, before using it.

A local attacker can therefore force a NULL pointer to be dereferenced in the slhc_init() function of the Linux kernel, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/L...




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