Sigma rule: Potential Information Disclosure CVE-2023-43261 Exploitation - Web

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-b93a9d693d19, updated 2023-10-30T00:00:00.000Z.

Rule

Title
Potential Information Disclosure CVE-2023-43261 Exploitation - Web
Status
test
Level
high
Author
Nasreddine Bencherchali (Nextron Systems), Thurein Oo
Date
2023-10-20
Modified
2023-10-30
File
rules-emerging-threats/2023/Exploits/CVE-2023-43261/web_exploit_cve_2023_43261_milesight_information_disclosure.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects exploitation attempts of CVE-2023-43261 and information disclosure in Milesight UR5X, UR32L, UR32, UR35, UR41 before v35.3.0.7 that allows attackers to access sensitive router components in access logs.

Log source

category
webserver
definition
Requirements: In order for this detection to trigger, access logs of the router must be collected.

Detection

selection:
    cs-method: 'GET'
    # Note: In theory the path can also be for other files. But since the logs can contains password and interesting information. Its most likely going to be targeted during a real attack
    cs-uri-stem|contains: '/lang/log/httpd.log' # Als covered .old
    sc-status: 200
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.initial-access
  • attack.t1190
  • cve.2023-43621
  • detection.emerging-threats

CVEs this rule names

MITRE ATT&CK ids this rule names

Related rules

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-43261/web_exploit_cve_2023_43261_milesight_information_disclosure.yml

Sources and licences

  • SigmaHQ

    "Potential Information Disclosure CVE-2023-43261 Exploitation - Web" by Nasreddine Bencherchali (Nextron Systems), Thurein Oo (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-43261/web_exploit_cve_2023_43261_milesight_information_disclosure.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Potential Information Disclosure CVE-2023-43261 Exploitation - Web",
entity page, dataset version ref-b93a9d693d19, updated 2023-10-30T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/a2bcca38-9f3a-4d5e-b603-0c587e8569d7 (accessed 2026-11-03).
Underlying source: SigmaHQ rule a2bcca38-9f3a-4d5e-b603-0c587e8569d7, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.