Potential Information Disclosure via CVE-2023-43261 in Milesight Router Proxy Logs
Alerts on HTTP GET 200 responses for UR router log paths in proxy requests associated with CVE-2023-43261.
- Category
- proxy
- Author
- Nasreddine Bencherchali (Nextron Systems), Thurein Oo (SigmaHQ), DRL 1.1
- Published
- 2023-10-20
- 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 HTTP GET requests recorded in proxy logs that return a successful status (200) while targeting the specific URI containing '/lang/log/httpd.log' (including .old variants). Such access may indicate attempted exploitation leading to information disclosure of sensitive router components captured in log content. It relies on proxy log fields for request method, requested URI, and the response status to flag likely exploitation activity.
Reporting behind it
- thehackernews.comhttps://thehackernews.com/2023/10/experts-warn-of-severe-flaws-affecting.html
- medium.comhttps://medium.com/@win3zz/inside-the-router-how-i-accessed-industrial-routers-and-reported-the-flaws-29c34213dfdf
- github.comhttps://github.com/win3zz/CVE-2023-43261
- vulncheck.comhttps://vulncheck.com/blog/real-world-cve-2023-43261
- github.comhttps://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2023/Exploits/CVE-2023-43261/proxy_exploit_cve_2023_43261_milesight_information_disclosure.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: Potential Information Disclosure via CVE-2023-43261 in Milesight Router Proxy Logs
id: 674aa757-1a48-4b20-a864-f20b032a8c48
related:
- id: a2bcca38-9f3a-4d5e-b603-0c587e8569d7
type: similar
- id: f48f5368-355c-4a1b-8bf5-11c13d589eaa
type: derived
status: test
description: This rule identifies HTTP GET requests recorded in proxy logs that return a successful status (200) while targeting the specific URI containing '/lang/log/httpd.log' (including .old variants). Such access may indicate attempted exploitation leading to information disclosure of sensitive router components captured in log content. It relies on proxy log fields for request method, requested URI, and the response status to flag likely exploitation activity.
references:
- https://thehackernews.com/2023/10/experts-warn-of-severe-flaws-affecting.html
- https://medium.com/@win3zz/inside-the-router-how-i-accessed-industrial-routers-and-reported-the-flaws-29c34213dfdf
- https://github.com/win3zz/CVE-2023-43261
- https://vulncheck.com/blog/real-world-cve-2023-43261
- https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2023/Exploits/CVE-2023-43261/proxy_exploit_cve_2023_43261_milesight_information_disclosure.yml
author: Nasreddine Bencherchali (Nextron Systems), Thurein Oo, Huntrule Team
date: 2023-10-20
modified: 2023-10-30
tags:
- attack.initial-access
- attack.t1190
- cve.2023-43621
- detection.emerging-threats
logsource:
category: proxy
detection:
selection:
cs-method: GET
c-uri|contains: /lang/log/httpd.log
sc-status: 200
condition: selection
falsepositives:
- Unknown
level: high
license: DRL-1.1