CVE intelligence and bounded remediation

CVE-2019-20044 — In Zsh before 5.8, attackers able to execute commands can regain privileges dropped by the --no-PRIVILEGED option

High CVSS 7.8

In Zsh before 5.8, attackers able to execute commands can regain privileges dropped by the --no-PRIVILEGED option. Zsh fails to overwrite the saved uid, so the original privileges can be restored by executing MODULE_PATH=/dir/with/module zmodload with a module that calls setuid().

Severity
High
CVSS
7.8 (3.1)
Published
2020-02-24
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-273

Affected products

  • zsh / zsh
  • fedoraproject / fedora / 30
  • fedoraproject / fedora / 31
  • debian / debian_linux / 8.0
  • debian / debian_linux / 9.0
  • apple / ipados

Showing 6 representative product identities from 34 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

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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