Synology DiskStation Manager 4.3-3810 file_sharing.cgi path traversal

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.
5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Synology DiskStation Manager 4.3-3810. It has been rated as critical. Affected is an unknown function of the file webapi/FileStation/file_sharing.cgi. Performing a manipulation results in path traversal. This vulnerability is identified as CVE-2013-6987. Additionally, an exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Synology DiskStation Manager 4.3-3810 (Network Attached Storage Software). It has been classified as critical. This affects an unknown function of the file webapi/FileStation/file_sharing.cgi. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Multiple directory traversal vulnerabilities in the FileBrowser components in Synology DiskStation Manager (DSM) before 4.3-3810 Update 3 allow remote attackers to read, write, and delete arbitrary files via a .. (dot dot) in the (1) path parameter to file_delete.cgi or (2) folder_path parameter to file_share.cgi in webapi/FileStation/; (3) dlink parameter to fbdownload/; or unspecified parameters to (4) html5_upload.cgi, (5) file_download.cgi, (6) file_sharing.cgi, (7) file_MVCP.cgi, or (8) file_rename.cgi in webapi/FileStation/.

The weakness was released 12/20/2013 by Andrea Fabrizi with andreafabrizi.it as Synology DSM multiple directory traversal as confirmed mailinglist post (Full-Disclosure). It is possible to read the advisory at seclists.org. The public release was coordinated with Synology. This vulnerability is uniquely identified as CVE-2013-6987 since 12/06/2013. It is possible to initiate the attack remotely. The successful exploitation requires a authentication. Technical details and a public exploit are known. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

A public exploit has been developed by Andrea Fabrizi in HTTP Request and been published immediately after the advisory. The exploit is shared for download at seclists.org. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 15 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 72346 (Synology DiskStation Manager < 4.3-3810 Update 3 Multiple FileBrowser Component Directory Traversal Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CGI abuses. The advisory illustrates:

The only countermeasure implemented against this vulnerability is the check that the path starts with a valid shared folder, so is enough to put the "../" straight after, to bypass the security check.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (89892), Exploit-DB (30475), Tenable (72346), SecurityFocus (BID 64483†) and OSVDB (101268†). Entries connected to this vulnerability are available at VDB-11565, VDB-11566, VDB-11567 and VDB-11568. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Andrea Fabrizi
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 72346
Nessus Name: Synology DiskStation Manager < 4.3-3810 Update 3 Multiple FileBrowser Component Directory Traversal Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

12/05/2013 🔍
12/06/2013 +1 days 🔍
12/20/2013 +14 days 🔍
12/20/2013 +0 days 🔍
12/20/2013 +0 days 🔍
12/20/2013 +0 days 🔍
12/20/2013 +0 days 🔍
12/23/2013 +3 days 🔍
12/24/2013 +1 days 🔍
12/30/2013 +6 days 🔍
12/31/2013 +1 days 🔍
02/05/2014 +36 days 🔍
02/20/2014 +15 days 🔍
01/15/2025 +3982 days 🔍

Sourcesinfo

Vendor: synology.com

Advisory: Synology DSM multiple directory traversal
Researcher: Andrea Fabrizi
Organization: andreafabrizi.it
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2013-6987 (🔍)
GCVE (CVE): GCVE-0-2013-6987
GCVE (VulDB): GCVE-100-11571
X-Force: 89892 - Synology DiskStation Manager (DSM) multiple scripts directory traversal
SecurityFocus: 64483 - Synology DiskStation Manager 'FileBrowser' Component Multiple Directory Traversal Vulnerabilities
Secunia: 56106 - Synology DiskStation Manager Multiple Security Bypass Vulnerabilities, Not Critical
OSVDB: 101268
Vulnerability Center: 43346 - Synology DiskStation Manager Before 4.3-3827 Remote File Read, Write and Delete, High

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

Entryinfo

Created: 12/23/2013 19:36
Updated: 01/15/2025 02:39
Changes: 12/23/2013 19:36 (92), 05/21/2017 14:17 (1), 06/04/2021 14:27 (3), 07/15/2024 04:56 (15), 01/15/2025 02:39 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!