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VULNERABILITIES

CVE-2019-18684 Details

Description

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

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7 HIGHVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd CVEExploitThird Party Advisory
https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd [email protected]ExploitThird Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')[email protected]

Affected Products

ProductVersions
sudo project sudo
<= 1.8.29

CPE

  • cpe:2.3:a:sudo_project:sudo:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

10 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2019-18684
NVD Published Date:
Nov 4, 2019
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2019-18684 Details - Not Deferred