This hunting search allows operator to discover attempts to exfiltrate data by executing a prepositioned malicious search ID in Analytic Workspace in Splunk Enterprise versions 8.2.9,8.1.12,9.0.2. The attack is browser-based. It requires the attacker to compel a victim to initiate a request within their browser (phishing). The attacker cannot exploit the vulnerability at will.
- Type: Hunting
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2022-11-1
- Author: Rod Soto, Eric McGinnis
- ID: b6d77c6c-f011-4b03-8650-8f10edb7c4a8
Kill Chain Phase
- Actions On Objectives
- CIS 10
|CVE-2022-43566||In Splunk Enterprise versions below 8.2.9, 8.1.12, and 9.0.2, an authenticated user can run risky commands using a more privileged user’s permissions to bypass SPL safeguards for risky commands https://docs.splunk.com/Documentation/SplunkCloud/latest/Security/SPLsafeguards in the Analytics Workspace. The vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser. The attacker cannot exploit the vulnerability at will.||None|
1 2 3 4 `audit_searches` info=granted search NOT ("audit_searches") search NOT ("security_content_summariesonly") AND ((search="*mstats*[*]*" AND provenance="N/A") OR (search="*mstats*\\\"*[*]*\\\"*")) | eval warning=if(match(search,"\\\\\""), "POTENTIAL INJECTION STAGING", "POTENTIAL INJECTION EXECUTION") | table search, user, warning, timestamp | `splunk_data_exfiltration_from_analytics_workspace_using_sid_query_filter`
The SPL above uses the following Macros:
splunk_data_exfiltration_from_analytics_workspace_using_sid_query_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
The vulnerability affects only instances with Splunk Web Enabled. After running this search, please run "Splunk Command and Scripting Interpreter Risky SPL MLTK" to gain more insight into potentially risky commands which could lead to data exfiltration.
Known False Positives
This search may produce false positives. This detection does not require you to ingest any new data. The detection does require the ability to search the _audit index. Special attention must be paid to "/en-US/app/search/analytics_workspace?sid=[sid]" which is where the malicious code will be inserted to trigger attack at victim.
Associated Analytic Story
|25.0||50||50||Potential data exfiltration attack using SID query by $user$|
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