Detection: Confluence Unauthenticated Remote Code Execution CVE-2022-26134

Updated Date: 2024-11-15 ID: fcf4bd3f-a79f-4b7a-83bf-2692d60b859c Author: Michael Haag, Splunk Type: TTP Product: Splunk Enterprise Security

Description

The following analytic detects attempts to exploit CVE-2022-26134, an unauthenticated remote code execution vulnerability in Confluence. It leverages the Web datamodel to analyze network and CIM-compliant web logs, identifying suspicious URL patterns and parameters indicative of exploitation attempts. This activity is significant as it allows attackers to execute arbitrary code on the Confluence server without authentication, potentially leading to full system compromise. If confirmed malicious, this could result in unauthorized access, data exfiltration, and further lateral movement within the network. Immediate investigation and remediation are crucial to prevent extensive damage.

Search

1
2| tstats count min(_time) as firstTime max(_time) as lastTime from datamodel=Web where Web.url IN ("*${*", "*%2F%7B*") (Web.url="*org.apache.commons.io.IOUtils*" Web.url="*java.lang.Runtime@getRuntime().exec*") OR (Web.url="*java.lang.Runtime%40getRuntime%28%29.exec*") OR (Web.url="*getEngineByName*" AND Web.url="*nashorn*" AND Web.url="*ProcessBuilder*") by Web.http_user_agent Web.http_method, Web.url,Web.url_length Web.src, Web.dest sourcetype 
3| `drop_dm_object_name("Web")` 
4| `security_content_ctime(firstTime)` 
5| `security_content_ctime(lastTime)` 
6| `confluence_unauthenticated_remote_code_execution_cve_2022_26134_filter`

Data Source

Name	Platform	Sourcetype	Source
Palo Alto Network Threat	Network	`'pan:threat'`	`'pan:threat'`

Macros Used

Name	Value
security_content_ctime	`convert timeformat="%Y-%m-%dT%H:%M:%S" ctime($field$)`
confluence_unauthenticated_remote_code_execution_cve_2022_26134_filter	`search *`

confluence_unauthenticated_remote_code_execution_cve_2022_26134_filter is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Annotations

- MITRE ATT&CK

+ Kill Chain Phases

+ NIST

+ CIS

- Threat Actors

ID	Technique	Tactic
T1505	Server Software Component	Persistence
T1190	Exploit Public-Facing Application	Initial Access
T1133	External Remote Services	Initial Access

Delivery

Installation

DE.CM

CIS 13

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Setting	Value
Disabled	true
Cron Schedule	`0 * * * *`
Earliest Time	`-70m@m`
Latest Time	`-10m@m`
Schedule Window	`auto`
Creates Notable	Yes
Rule Title	`%name%`
Rule Description	`%description%`
Notable Event Fields	user, dest
Creates Risk Event	True

This configuration file applies to all detections of type TTP. These detections will use Risk Based Alerting and generate Notable Events.

Implementation

This detection requires the Web datamodel to be populated from a supported Technology Add-On like Splunk for Apache or Splunk for Nginx. In addition, network based logs or event data like PAN Threat.

Known False Positives

Tune based on assets if possible, or restrict to known Confluence servers. Remove the ${ for a more broad query. To identify more exec, remove everything up to the last parameter (Runtime().exec) for a broad query.

Associated Analytic Story

Risk Based Analytics (RBA)

Risk Message:

A URL was requested related to CVE-2022-26134, a unauthenticated remote code execution vulnerability, on $dest$ by $src$.

Risk Object	Risk Object Type	Risk Score	Threat Objects
dest	system	100	src

References

Detection Testing

Test Type	Status	Dataset	Source	Sourcetype
Validation	✅ Passing	N/A	N/A	N/A
Unit	✅ Passing	Dataset	`pan:threat`	`pan:threat`
Integration	✅ Passing	Dataset	`pan:threat`	`pan:threat`

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

Source: GitHub | Version: 4