CVE intelligence and bounded remediation

CVE-2022-31214 — A Privilege Context Switching issue was discovered in join.c in Firejail 0.9.68

High CVSS 7.8

A Privilege Context Switching issue was discovered in join.c in Firejail 0.9.68. By crafting a bogus Firejail container that is accepted by the Firejail setuid-root program as a join target, a local attacker can enter an environment in which the Linux user namespace is still the initial user namespace, the NO_NEW_PRIVS prctl is not activated, and the entered mount namespace is under the attacker's control. In this way, the filesystem layout can be adjusted to gain root privileges through execution of available setuid-root binaries such as su or sudo.

Severity
High
CVSS
7.8 (3.1)
Published
2022-06-09
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-269

Affected products

  • firejail_project / firejail / 0.9.68
  • fedoraproject / fedora / 35
  • fedoraproject / fedora / 36
  • fedoraproject / fedora / 37
  • debian / debian_linux / 9.0
  • debian / debian_linux / 10.0

Matched remediation archetype

Privilege escalation and unsafe privilege management

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map service accounts, operating-system identities, roles, capabilities, impersonation, set-user transitions, and administrative helper paths.
  • Determine whether untrusted users or lower-privilege processes can reach the affected transition or modify inputs it trusts.
  • Review file, socket, registry, device, job, container, and cloud-role permissions used before and after privilege changes.

Remediate safely

  • Apply the supported fix and redesign privileged operations as a minimal, authenticated, allowlisted interface.
  • Drop privileges before processing untrusted input, verify the drop succeeds, and remove unnecessary roles, capabilities, and write permissions.
  • Validate ownership and permissions at time of use and add explicit lower-to-higher privilege boundary tests.

Authoritative sources

Complete CVE record and remediation plan

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