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Vigil@nce - Linux kernel: privilege escalation via Zero Address Mapping expand_downwards
May 2019 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer/Computer-vulnerability-database-and-alert
SYNTHESIS OF THE VULNERABILITY
Impacted products: Debian, Fedora, Linux, openSUSE Leap, RHEL,
SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity: 2/4.
Consequences: administrator access/rights, denial of service on
server.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 06/03/2019.
DESCRIPTION OF THE VULNERABILITY
An attacker can bypass restrictions via Zero Address Mapping
expand_downwards() of the Linux kernel, in order to escalate his
privileges.
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