Detection rules › Sigma
CVE-2023-22518 Exploitation Attempt - Suspicious Confluence Child Process (Linux)
Detects exploitation attempt of CVE-2023-22518 (Confluence Data Center / Confluence Server), where an attacker can exploit vulnerable endpoints to e.g. create admin accounts and execute arbitrary commands.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1190 Exploit Public-Facing Application |
| Execution | T1059 Command and Scripting Interpreter |
Event coverage
| Provider | Event |
|---|---|
| Sysmon-for-Linux | Event ID 1 |
Rule body yaml
title: CVE-2023-22518 Exploitation Attempt - Suspicious Confluence Child Process (Linux)
id: f8987c03-4290-4c96-870f-55e75ee377f4
related:
- id: 1ddaa9a4-eb0b-4398-a9fe-7b018f9e23db
type: similar
status: test
description: |
Detects exploitation attempt of CVE-2023-22518 (Confluence Data Center / Confluence Server), where an attacker can exploit vulnerable endpoints to e.g. create admin accounts and execute arbitrary commands.
references:
- https://confluence.atlassian.com/security/cve-2023-22518-improper-authorization-vulnerability-in-confluence-data-center-and-server-1311473907.html
- https://www.huntress.com/blog/confluence-to-cerber-exploitation-of-cve-2023-22518-for-ransomware-deployment
- https://github.com/ForceFledgling/CVE-2023-22518
author: Andreas Braathen (mnemonic.io)
date: 2023-11-14
tags:
- attack.execution
- attack.t1059
- attack.initial-access
- attack.t1190
- cve.2023-22518
- detection.emerging-threats
logsource:
category: process_creation
product: linux
detection:
selection_parent:
ParentImage|endswith: '/java'
ParentCommandLine|contains: 'confluence'
selection_child:
# Only children associated with known campaigns
Image|endswith:
- '/bash'
- '/curl'
- '/echo'
- '/wget'
filter_main_ulimit:
CommandLine|contains: 'ulimit -u'
condition: all of selection_* and not 1 of filter_main_*
falsepositives:
- Unlikely
level: high
Stages and Predicates
Stage 0: condition
all of selection_* and not 1 of filter_main_*Stage 1: selection_parent
selection_parent:
ParentImage|endswith: '/java'
ParentCommandLine|contains: 'confluence'
Stage 2: selection_child
selection_child:
Image|endswith:
- '/bash'
- '/curl'
- '/echo'
- '/wget'
Stage 3: not filter_main_ulimit
filter_main_ulimit:
CommandLine|contains: 'ulimit -u'
Exclusions
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
CommandLine | match | ulimit -u |
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
Image | ends_with |
|
ParentCommandLine | match |
|
ParentImage | ends_with |
|