Vigil@nce - Linux kernel: read-write access via Nfsd No-ACL Unapplied Umask
October 2020 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/computer-vulnerability
SYNTHESIS OF THE VULNERABILITY
– Impacted products: Linux, openSUSE Leap, SUSE Linux Enterprise
Desktop, SLES, Ubuntu.
– Severity: 2/4.
– Consequences: data reading, data creation/edition, data deletion.
– Provenance: user shell.
– Confidence: confirmed by the editor (5/5).
– Creation date: 20/08/2020.
DESCRIPTION OF THE VULNERABILITY
An attacker can bypass access restrictions via Nfsd No-ACL
Unapplied Umask of the Linux kernel, in order to read or alter
data.
ACCESS TO THE FULL VIGIL@NCE BULLETIN