THIS IS A EXPERIMENTAL DETECTION
This detection has been marked experimental by the Splunk Threat Research team. This means we have not been able to test, simulate, or build datasets for this detection. Use at your own risk. This analytic is NOT supported.
This search detects remote code exploit attempts on F5 BIG-IP, BIG-IQ, and Traffix SDC devices
- Type: TTP
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2020-08-02
- Author: Shannon Davis, Splunk
- ID: 810e4dbc-d46e-11ea-87d0-0242ac130003
Kill Chain Phase
- CIS 8
- CIS 11
|CVE-2020-5902||In BIG-IP versions 15.0.0-184.108.40.206, 14.1.0-220.127.116.11, 13.1.0-18.104.22.168, 12.1.0-22.214.171.124, and 11.6.1-126.96.36.199, the Traffic Management User Interface (TMUI), also referred to as the Configuration utility, has a Remote Code Execution (RCE) vulnerability in undisclosed pages.||10.0|
1 2 3 4 `f5_bigip_rogue` | regex _raw="(hsqldb; |.*\\.\\.;.*)" | search `detect_f5_tmui_rce_cve_2020_5902_filter`
The SPL above uses the following Macros:
detect_f5_tmui_rce_cve-2020-5902_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
To consistently detect exploit attempts on F5 devices using the vulnerabilities contained within CVE-2020-5902 it is recommended to ingest logs via syslog. As many BIG-IP devices will have SSL enabled on their management interfaces, detections via wire data may not pick anything up unless you are decrypting SSL traffic in order to inspect it. I am using a regex string from a Cloudflare mitigation technique to try and always catch the offending string (..;), along with the other exploit of using (hsqldb;).
Known False Positives
Associated Analytic Story
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
source | version: 1