Linux: Detects Nimbuspwn-related exploit strings targeting CVE-2022-29799/CVE-2022-27800

Detects Linux keyword patterns suggesting Nimbuspwn-style traversal attempts via networkd-dispatcher error handling.

FreeReviewedSigma · High · v5

Product: linux
Author: Bhabesh Raj (SigmaHQ), DRL 1.1
Published: 2022-05-04
Updated: 2026-07-31

ATT&CK techniques

Priv Esc

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
- T1068Exploitation for Privilege Escalation
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule matches Linux telemetry containing specific keyword combinations associated with potential Nimbuspwn exploit activity tied to CVE-2022-29799 and CVE-2022-27800. Attackers may use these strings as part of payload or error-path behaviors to probe or attempt privilege escalation. The detection relies on logs that include the named component and the listed text fragments, including the presence of a directory traversal pattern.

Reporting behind it

Related detections9 linkedT1068 — drag to rearrange

Malicious EDR Evasion Driver Load from AnyDesk Directory via k.sys (via image_load)

Malicious Zemana Vulnerable Driver Load for EDR Termination (via image_load)

Suspicious EDRKillShifter Vulnerable Driver Load from User Temp Directory (via image_load)

Suspicious Process Explorer Kernel Driver Dropped as PED.sys via File Creation (via file_event)

Malicious Payload Download From copy.fail Exploit Host on Linux (via process_creation)

Suspicious su Execution From Uncommon Parent Process on Linux (via process_creation)

Possible noPac sAMAccountName Spoofing via Machine Account Rename

Possible macOS TCC Bypass via mdimport Loading Custom Spotlight Importer

Suspicious CLFS Base Log File Created in SkyPDF ProgramData Path during Zero-Day Exploitation (via file_event)

Linux: Detects Nimbuspwn-related exploit strings targeting CVE-2022-29799/CVE-2022-27800

Pivot detection · T1068 · 9 related

Changelog

v5
Candidate ingested via manual entry.2026-07-31
v4
Candidate ingested via manual entry.2026-07-31
v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

linux-nimbuspwn-path-traversal-attempts-targeting-networkd-dispatcher-7ba05b43

title: "Linux: Detects Nimbuspwn-related exploit strings targeting CVE-2022-29799/CVE-2022-27800"
id: 30440fd8-6ab7-43d8-b88f-07e4d0c3efb3
status: test
description: This rule matches Linux telemetry containing specific keyword combinations associated with potential Nimbuspwn exploit activity tied to CVE-2022-29799 and CVE-2022-27800. Attackers may use these strings as part of payload or error-path behaviors to probe or attempt privilege escalation. The detection relies on logs that include the named component and the listed text fragments, including the presence of a directory traversal pattern.
references:
  - https://www.microsoft.com/security/blog/2022/04/26/microsoft-finds-new-elevation-of-privilege-linux-vulnerability-nimbuspwn/
  - https://github.com/Immersive-Labs-Sec/nimbuspwn
  - https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2022/Exploits/CVE-2022-29799/lnx_exploit_cve_2022_27999_cve_2022_27800.yml
author: Bhabesh Raj, Huntrule Team
date: 2022-05-04
modified: 2025-11-03
tags:
  - attack.privilege-escalation
  - attack.t1068
  - detection.emerging-threats
  - cve.2022-29799
  - cve.2022-27800
logsource:
  product: linux
detection:
  keywords:
    "|all":
      - networkd-dispatcher
      - Error handling notification for interface
      - ../../
  condition: keywords
falsepositives:
  - Unknown
level: high
license: DRL-1.1
related:
  - id: 7ba05b43-adad-4c02-b5e9-c8c35cdf9fa8
    type: derived

Convert

This rule as a query you can run. Uses no unlock credit.

SplunkSPL