SALTO ProAccess SPACE 5.5 Traversal / File Write / XSS / Bypass

2019.12.03
Credit: W. Schober
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-79
CWE-22

SEC Consult Vulnerability Lab Security Advisory < 20191202-0 > ======================================================================= title: Multiple Critical Vulnerabilities product: SALTO ProAccess SPACE vulnerable version: <= v5.5 fixed version: >= v5.6 CVE number: CVE-2019-19457, CVE-2019-19458, CVE-2019-19459, CVE-2019-19460 impact: critical homepage: https://www.saltosystems.com/en/ found: 2019-05-22 by: Werner Schober (Office Vienna) SEC Consult Vulnerability Lab An integrated part of SEC Consult Europe | Asia | North America https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "SALTO ProAccess SPACE Software is a powerful access control management tool that enables you to program access time zones for each user, manage different calendars and obtain audit trails from each door to see who has passed through it. The software includes special functions such as automatic door status changes, anti-passback and relay management. Thanks to its advanced software features, SALTO ProAccess SPACE is also one of the most user-friendly and powerful software products for the access control management of stand-alone wireless devices, and IP online devices in one converged complete access control platform for the user, keys and doors management." Source: http://proaccess-space.saltosystems.com/features/ Business recommendation: ------------------------ The vendor provides a patch which should be installed immediately. SEC Consult recommends to perform a thorough security review conducted by security professionals to identify and resolve all security issues. Vulnerability overview/description: ----------------------------------- 1. Path Traversal (CVE-2019-19458) Path traversal vulnerabilities allow attackers access to files and directories outside the application root through relative file paths in the user input. During a quick security check, multiple locations in the web application were identified, which allow an attacker to traverse outside of the application root. The vulnerabilities got identified in the "Data Export" as well as "Database Export" functionality. Those vulnerabilities can for example be used to dump the whole database into the web root, by traversing outside of the application root. 2. Arbitrary File Write (CVE-2019-19459) By further exploiting the path traversal vulnerability inside of the "Data Export" feature, an attacker is able to traverse into arbitrary paths and write arbitrary files with arbitrary contents. Some examples are files to the web root, or bat files into auto start. This allows an attacker to execute arbitrary commands on the server. 3. Stored Cross-Site-Scripting (CVE-2019-19457) By adding devices to the SALTO network with a JavaScript payload inside of certain parameters, an attacker is able to permanently embed arbitrary JavaScript payloads inside of the web application. 4. Webserver running as SYSTEM (Windows Service) per Default (CVE-2019-19460) The webserver of the SALTO ProAccess SPACE is running as a Windows Service with local SYSTEM permissions per default. This is against the principle of least privilege. An attacker, who is able to exploit the path traversal, or arbitrary file write vulnerability, is basically able to write to every single path on the file system, because the webserver is running with the highest privileges available. 5. Authorization Issues Multiple API calls were identified in the SALTO ProAccess SPACE web application, that could normally only be called by high privileged users. Nevertheless, by directly calling the API with the OAuth token of a low privileged user, it was possible to call some API calls that shouldn't be available to them. 6. Cleartext transmission of sensitive data The SALTO ProAccess SPACE web application allows their users to create so called event streams. Those streams can be used to log events centrally. The stream is transmitted via TCP/UDP in JSON, or CSV format. The stream is transmitted in cleartext and leaks sensitive data such as who opened which door and when including card ids etc. Proof of concept: ----------------- 1. Path Traversal (CVE-2019-19458) The "Data Export" as well as the "Database Export" features in SALTO ProAccess SPACE allow users to specify a filename for the different exports. By using special characters inside of the filename, an attacker is able to traverse outside of the designated export path and place the exports in arbitrary locations. For example, the following filename can be used in the database export to store the database backup inside of the webroot: ..\..\..\..\SALTO\ProAccess Space\bin\webapp\backup.db The file can then be easily retrieved via the following link without authentication: http(s)://$IP/backup.db 2. Arbitrary File Write (CVE-2019-19459) The vulnerability described above can be further developed into an arbitrary file write vulnerability by using the "Data Export" functionality. The webapp lets their users choose an export filename and the fields, which should be exported (e.g. Username, Notes field). To store a file with arbitrary contents on the file system the following steps have to be conducted: a. Store the payload inside of an arbitrary field, that can be manipulated by the user. (E.g. Username is set to "<img src=x onerror=alert(document.location)>" as an example for stored XSS) b. Create a new export with the following export file name "..\..\SALTO\ProAccess Space\bin\webapp\sectest.html" c. Finalize the export d. Access the file without authentication via http(s)://$IP/sectest.html 3. Stored Cross-Site-Scripting (CVE-2019-19457) By injecting arbitrary JavaScript payloads inside of the name of a SALTO network device (e.g. RFID Wall Reader) an attacker is able to permanently embed malicious JavaScript code inside of the web application that is executed as soon as certain pages are visited. 4. Webserver running as SYSTEM (Windows Service) per Default (CVE-2019-19460) In a standard configuration the SALTO service, which is also serving the webserver on port 8100 is running as a local windows service. Naturally, this results in multiple issues. One of them is, that the webserver is automatically running with SYSTEM privileges. 5. Authorization Issues The following API calls can be accessed by a low privileged user without any permissions (except login permissions) set: /rpc/DirectoryExists /rpc/GetLicense Those API calls can be perfectly used to evaluate, which folders exist on the file system. 6. Cleartext transmission of sensitive data No PoC available. Vulnerable / tested versions: ----------------------------- The following versions have been tested: * SALTO ProAccess SPACE 5.4.3.0 * Service Binary Version 4.13.3.404 Vendor contact timeline: ------------------------ 2019-05-24: Contacting vendor through info@saltosystems.com 2019-05-24: Initial response from Salto Systems; providing a PGP public key for encrypted communication 2019-05-24: Sending the encrypted advisory to Salto Systems 2019-06-11: Requesting a status update. 2019-06-12: Vendor responded with a detailed plan on how and when the vulnerabilities are going to be fixed. 2019-09-02: Requesting status update. 2019-09-04: Vendor provides version information and further release plan updates 2019-09 - 2019-11: Multiple emails exchanged and telephone conferences discussing the vulnerabilities 2019-12-02: Coordinated advisory release. Solution: --------- Update to SALTO ProAccess SPACE 5.6 which is available to customers through the vendor's software area. Workaround: ----------- No workaround available. Advisory URL: ------------- https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Europe | Asia | North America About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://www.sec-consult.com/en/career/index.html Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/contact/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF Werner Schober / @2019


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