F5 BIG-IP Proxy: Detect POST requests exploiting CVE-2023-46747 via /mgmt/tm/util/bash
Alerts on POST requests containing /mgmt/tm/util/bash plus TMUI control/user-create form parameters indicative of CVE-2023-46747 exploitation.
- Category
- proxy
- Author
- Nasreddine Bencherchali (Nextron Systems) (SigmaHQ), DRL 1.1
- Published
- 2023-11-08
- Updated
- 2026-07-31
ATT&CK techniques
Initial AccessRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule identifies likely exploitation attempts for CVE-2023-46747 by matching specific HTTP POST traffic on F5 BIG-IP proxy endpoints. It looks for requests containing a bash utility path and exact form-related parameters that are used to reach a user creation workflow. The detection relies on proxy HTTP telemetry fields including the HTTP method and request URI, plus the presence of the expected body content patterns in the POST body.
Reporting behind it
- github.comhttps://github.com/AliBrTab/CVE-2023-46747-POC/tree/main
- github.comhttps://github.com/0xorOne/nuclei-templates/blob/2fef4270ec6e5573d0a1732cb18bcfc4b1580a88/http/cves/2023/CVE-2023-46747.yaml
- mp.weixin.qq.comhttps://mp.weixin.qq.com/s/wUoBy7ZiqJL2CUOMC-8Wdg
- praetorian.comhttps://www.praetorian.com/blog/refresh-compromising-f5-big-ip-with-request-smuggling-cve-2023-46747/
- github.comhttps://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2023/Exploits/CVE-2023-46747/proxy_cve_2023_46747_f5_remote_code_execution.yml
Changelog
v5- v5Candidate ingested via manual entry.2026-07-31
- v4Candidate ingested via manual entry.2026-07-31
- v3Candidate ingested via manual entry.2026-07-31
- v2Candidate ingested via manual entry.2026-07-31
- v1No 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.
title: "F5 BIG-IP Proxy: Detect POST requests exploiting CVE-2023-46747 via /mgmt/tm/util/bash"
id: 442e1bb2-92f8-4343-bd4d-356cc372c9ed
related:
- id: e9928831-ba14-42ea-a4bc-33d352b9929a
type: similar
- id: f195b2ff-e542-41bf-8d91-864fb81e5c20
type: derived
status: test
description: This rule identifies likely exploitation attempts for CVE-2023-46747 by matching specific HTTP POST traffic on F5 BIG-IP proxy endpoints. It looks for requests containing a bash utility path and exact form-related parameters that are used to reach a user creation workflow. The detection relies on proxy HTTP telemetry fields including the HTTP method and request URI, plus the presence of the expected body content patterns in the POST body.
references:
- https://github.com/AliBrTab/CVE-2023-46747-POC/tree/main
- https://github.com/0xorOne/nuclei-templates/blob/2fef4270ec6e5573d0a1732cb18bcfc4b1580a88/http/cves/2023/CVE-2023-46747.yaml
- https://mp.weixin.qq.com/s/wUoBy7ZiqJL2CUOMC-8Wdg
- https://www.praetorian.com/blog/refresh-compromising-f5-big-ip-with-request-smuggling-cve-2023-46747/
- https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2023/Exploits/CVE-2023-46747/proxy_cve_2023_46747_f5_remote_code_execution.yml
author: Nasreddine Bencherchali (Nextron Systems), Huntrule Team
date: 2023-11-08
tags:
- attack.initial-access
- attack.t1190
- cve.2023-46747
- detection.emerging-threats
logsource:
category: proxy
definition: "Requirements: The POST request body data must be collected in order to make use of this detection"
detection:
selection:
cs-method: POST
c-uri|contains: /mgmt/tm/util/bash
keywords_hex:
"|all":
- 2f746d75692f436f6e74726f6c2f666f726d
- 666f726d5f706167653d253266746d756925326673797374656d253266757365722532666372656174652e6a7370
keywords_plain:
"|all":
- /tmui/Control/form
- form_page=%2ftmui%2fsystem%2fuser%2fcreate.jsp
condition: selection and (keywords_hex or keywords_plain)
falsepositives:
- Unlikely
level: high
license: DRL-1.1