SEC Consult Vulnerability Lab Security Advisory < 20160725-0 > ======================================================================= title: Multiple vulnerabilities product: Micro Focus (former Novell) Filr Appliance vulnerable version: Filr 2 <=2.0.0.421, Filr 1.2 <= 1.2.0.846 fixed version: Filr 2 v2.0.0.465, Filr 1.2 v1.2.0.871 CVE number: CVE-2016-1607, CVE-2016-1608, CVE-2016-1609 CVE-2016-1610, CVE-2016-1611 impact: critical homepage: https://www.novell.com/products/filr/ found: 2016-05-23 by: W. Ettlinger (Office Vienna) SEC Consult Vulnerability Lab An integrated part of SEC Consult Bangkok - Berlin - Linz - Montreal - Moscow Singapore - Vienna (HQ) - Vilnius - Zurich https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Unlike other mobile file access and collaborative file sharing solutions, Micro Focus Filr has been designed with the enterprise in mind, resulting in less administration, better security and more productive users." URL: https://www.novell.com/products/filr/ Business recommendation: ------------------------ During a very quick security check several vulnerabilities with high impact have been discovered. SEC Consult recommends to immediately apply the patches provided by Micro Focus to address these issues. Please note that since SEC Consult did not conduct a thorough technical security check SEC Consult cannot make a statement regarding the overall security of the Micro Focus Filr appliance. Vulnerability overview/description: ----------------------------------- During a quick security check several vulnerabilities have been identified that ultimately allow an attacker to completely compromise the appliance: 1) Cross Site Request Forgery (CSRF) - CVE-2016-1607 Several functions within the appliance's administative interface lack protection against CSRF attacks. This allows an attacker who targets an authenticated administrator to reconfigure the appliance. 2) OS Command Injection - CVE-2016-1608 The appliance administrative interface allows an authenticated attacker to execute arbitrary operating system commands. Please note that an attacker can combine this vulnerability with vulnerability #1. In this scenario, an attacker does not need to be authenticated. 3) Insecure System Design The appliance uses a Jetty application server to provide the appliance administration interface. This application server is started as the superuser "root". Please note that combined with vulnerability #1 and #2 an attacker can run commands as the superuser "root" without the need for any authentication. For vendor remark on #3 see solution section. 4) Persistent Cross-Site Scripting - CVE-2016-1609 The Filr web interface uses a blacklist filter to try to strip any JavaScript code from user input. However, this filter can be bypassed to persistently inject JavaScript code into the Filr web interface. 5) Missing Cookie Flags The httpOnly cookie flag is not set for any session cookies set by both the administrative appliance web interface and the Filr web interface. Please note that combined with vulnerability #4 an attacker can steal session cookies of both the appliance administration interface and the Filr web interface (since cookies are shared across ports). For vendor remark on #5 see solution section. 6) Authentication Bypass - CVE-2016-1610 An unauthenticated attacker is able to upload email templates. 7) Path Traversal - CVE-2016-1610 The functionality that allows an administrator to upload email templates fails to restrict the directory the templates are uploaded to. Please note that combined with vulnerability #6 an attacker is able to upload arbitray files with the permissions of the system user "wwwrun". 8) Insecure File Permissions - CVE-2016-1611 A file that is run upon system user login is world-writeable. This allows a local attacker with restricted privileges to inject commands that are being executed as privileged users as soon as they log into the system. Please note that combined with vulnerabilities #6 and #7 an unauthenticated attacker can inject commands that are executed as privileged system users (e.g. root) using the Filr web interface. Proof of concept: ----------------- 1, 2, 3) The following HTML fragment demonstrates that using a CSRF attack (#1) system commands can be injected (#2) that are executed as the user root (#3): ----- snip -----
----- snip ----- 4) The following string demonstrates how the XSS filter can be circumvented: This string can e.g. be used by a restricted user in the "phone" field of the user profile. The script is executed by anyone viewing the profile (e.g. admins). 5) None of the session cookies are set with the httpOnly flag. 6, 7, 8) The following Java fragment demonstrates how an unauthenticated attacker (#6) can overwrite a file in the filesystem (#7 & #8) that is executed upon user login of e.g. the root user: ----- snip ----- String sessionCookie = "sectest"; String host = "http://