CVE-2021-41773 Detection Scenario by crowdsecurity | CrowdSec Hub

CVE-2021-41773

Attack scenariohttp:exploitMITRE T1190MITRE T1595cve.CVE-2021-41773

By: crowdsecurity
Version: 0.3
Name: crowdsecurity/http-cve-2021-41773
Remediation: Ban

Apache - Path Traversal (CVE-2021-41773)

Install with a top-level collection

16 collections include it

sudo cscli collections install crowdsecurity/whm

Installs 18 parsers and 66 scenarios, via HTTP - CVE Detection.

View WHM →

Installation

sudo cscli scenarios install crowdsecurity/http-cve-2021-41773

Then reload CrowdSec: sudo systemctl reload crowdsec

Configuration

Hover a line or a note to see what each field does.

scenarios/crowdsecurity/http-cve-2021-41773.yaml· 23 linesGitHub

1type: trigger1
2format: 2.0
3#debug: true
4name: crowdsecurity/http-cve-2021-41773
5description: "Apache - Path Traversal (CVE-2021-41773)"
6filter: |2
7  evt.Meta.log_type in ["http_access-log", "http_error-log"] and 
8    (Upper(evt.Meta.http_path) contains "/.%2E/.%2E/"
9      or
10     Upper(evt.Meta.http_path) contains "/%2E%2E/%2E%2E")
11groupby: "evt.Meta.source_ip"3
12blackhole: 2m4
13labels:
14  confidence: 3
15  spoofable: 0
16  classification:5
17    - attack.T1190
18    - attack.T1595
19    - cve.CVE-2021-41773
20  behavior: "http:exploit"
21  label: "CVE-2021-41773"
22  service: apache
23  remediation: true6

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