CVE-2022-29527

Root privilege escalation via sudoers permission race

Published Apr 20, 2022 · Updated Aug 3, 2024

Improper file permissions in Amazon SSM Agent before 3.1.1208.0 allow local users to escalate privileges to root through a sudoers race. createSudoersFileIfNotPresent uses os.Create to create /etc/sudoers.d/ssm-agent-users with mode 0666, then changes it to 0440. A local user must win the brief creation-to-chmod window on a system where /etc/sudoers.d is readable to append a Sudo rule and execute commands as root.

CVSS severity7.0
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper file permissions in Amazon SSM Agent before 3.1.1208.0 allow local users to escalate privileges to root through a sudoers race. createSudoersFileIfNotPresent uses os.Create to create /etc/sudoers.d/ssm-agent-users with mode 0666, then changes it to 0440. A local user must win the brief creation-to-chmod window on a system where /etc/sudoers.d is readable to append a Sudo rule and execute commands as root.

The record

CVE
CVE-2022-29527
Published
Apr 20, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-732, CWE-362, T1548.003
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.9NIST NVDAV:L/AC:M/Au:N/C:C/I:C/A:C
8.4SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1548.003Sudo and Sudo Caching

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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