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Vigil@nce - Linux kernel: privilege escalation via keyctl update
March 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can use a Negatively Instantiated key on the
Linux kernel, in order to escalate his privileges.
Impacted products: Linux, openSUSE Leap, SUSE Linux Enterprise
Desktop, SLES.
Severity: 2/4.
Creation date: 19/01/2016.
DESCRIPTION OF THE VULNERABILITY
The Linux kernel can store cryptographic keys, which are managed
using keyctl.
However, a local attacker can alter a key with errors (Negatively
Instantiated, KEY_FLAG_NEGATIVE).
A local attacker can therefore use a Negatively Instantiated key
on the Linux kernel, in order to escalate his privileges.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/Linux-kernel-privilege-escalation-via-keyctl-update-18753
