TI-2019-13520 Aliases CVE-2019-18684 GHSA-h9q8-53pc-hhxf

Sudo through 1.8.29 allows local users to escalate to root if they have write access to…

LOW 31CWE-362Published 2019-11-04 · Updated 2024-08-05

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write "ALL ALL=(ALL) NOPASSWD:ALL" to /proc/#####/fd/3 at a time when Sudo is prompting for a password. NOTE: This has been disputed due to the way Linux /proc works. It has been argued that writing to /proc/#####/fd/3 would only be viable if you had permission to write to /etc/sudoers. Even with write permission to /proc/#####/fd/3, it would not help you write to /etc/sudoers

Why it matters now

EPSS 0.00294 22nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:sudo_project:sudo::::::::	up to 1.8.29	Vulnerable	Sudo project

cpe:2.3:a:sudo_project:sudo:*:*:*:*:*:*:*:* Versions up to 1.8.29 Vulnerable ·Sudo project

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 4 products

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8

Timeline

2026-10-02 Threatist record created from CVE-2019-18684
2026-10-03 Alias added: GHSA-h9q8-53pc-hhxf

References

Exploit 1

https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd

TI-2025-23530 Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf… KEVCVSS 3.1CRITICAL 9.3
TI-2021-02242 Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer… KEVCVSS 3.1HIGH 7.8
TI-2019-10640 In Sudo before 1.8.28, an attacker with access to a Runas ALL sudoer account can bypass… CVSS 3.1HIGH 8.8
TI-2023-08978 In Sudo before 1.9.12p2, the sudoedit (aka -e) feature mishandles extra arguments passed… CVSS 3.1HIGH 7.8
TI-2019-13477 In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a… CVSS 3.1HIGH 7.8
TI-2025-23529 Incorrect authorization in Sudo CVSS 3.1HIGH 8.8

See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences