Vigil@nce - Linux kernel: privilege escalation via User Namespace map_write
January 2019 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
Impacted products: Linux, Ubuntu.
Consequences: administrator access/rights, privileged access/rights, data reading, data creation/edition.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 14/11/2018.
DESCRIPTION OF THE VULNERABILITY
An attacker can bypass restrictions via User Namespace map_write() of the Linux kernel, in order to escalate his privileges.
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