Secure Network - Security Research Advisory Vuln name: Multiple Vulnerabilities in Hummingbird Collaboration Systems affected: Collaboration 5.2.1 and lower versions Severity: Low Local/Remote: Remote Vendor URL: http://www.hummingbird.com/products/enterprise/collaboration/ Author(s): Luca Carettoni - luca.carettoni (at) securenetwork (dot) it [email concealed] Federico Maggi - federico.maggi (at) securenetwork (dot) it [email concealed] Vendor disclosure: 20th December 2005 Vendor acknowledged: 21st December 2005 Public disclosure: 10th January 2006 Advisory number: SN-2006-01 Advisory URL: http://www.securenetwork.it/advisories/ *** SUMMARY *** Hummingbird Collaboration is a Web-based collaborative groupware for teams across and beyond the enterprise. It integrates different works on single projects accessed by several concurrent users, improving efficiency, organization and automated workflow. Regular and registered users can easily access to all project information, documents, discussion threads, tasks list through the Web. It includes several utilities like messaging system, project and file manager and a Web calendar. (a) Cross-Site Scripting (XSS), (b) improper file handling and (c) information disclosure vulnerabilities are present and can be exploited remotely. *** VULNERABILITY DETAILS *** (a) Cross Site Scripting (XSS) A second-order XSS have been found. It allows permanent scripting by uploading malicious client side scripts by embedding them in a HTML page. Hummingbird Collaboration does not verify the content of HTML files during the uploading process. In addition, the collaborative groupware does not force the HTML to be downloaded (e.g. forcing the "Content-Disposition" property): As a result, the HTML page and embedded scripts are normally interpreted and rendered by the user browser. An attacker could (1) plan session hijacking attacks, (2) prepare phishing (a regular user could be tricked by presenting him/her with a fake login page) and (3) affect the usability and the availability of the service. (b) Improper file handling Using a crafted URL, a user could force the download of a previously uploaded file changing its original name. By exploiting this vulnerability, a regular user can be tricked about file content and filename of what he/she's downloading. (c) Information disclosure By inspecting some application responses it is possible to get more information about the parameters type and format. Instead of displaying generic error messages, detailed information are sent to the client (e.g. the parameter must be TRUE or FALSE). Moreover, by inspecting the application cookies is it possible to get internal network information about the IP address of the application server. *** EXPLOIT *** (a) An attacker can simply upload an HTML file with embedded malicious scripts (e.g. Javascript) using the file manager utility. (b) An attacker would need to trick the user into downloading a certain file with a crafted URL, like the following one: https://mySite/hc/hc/fake.doc?d=fc&o=dwnd&fid=1189762&did=89777&x=16080& doc_ext=.txt In this example, the file with id equal to 1189762 is downloaded, changing the name and the type of txt file in "fake.doc". Other techniques (e.g. XSS) make it easy to create a fake link similar to the previous one. (c) In most cases it just involves the inspection of server responses. The following URL shows an example of improper error handling https://mySite/hc/hc?d=mes&x=20433&ntb=[numericParam] using [numericParam] instead of a string parameter. The internal IP address is "encoded" into the cookie name (e.g. com.peopledoc.rhum.JURA_SESSION_ID_192.168.1.1_0.71221182=972323;). *** FIX INFORMATION *** The vendor suggests that updating the software solves this vulnerability, however we have not been able to test the latest versions and to confirm this. Future versions will also integrate a scan engine to detect malicious Javascript. *** WORKAROUNDS *** It should be noted that the server may only be accessed by users who have accounts and who have been correctly authenticated. Users may be restricted to be read-only so that they cannot upload files. ********************* *** LEGAL NOTICES *** ********************* Secure Network (www.securenetwork.it) is an information security company, which provides consulting and training services, and engages in security research and development. We are committed to open, full disclosure of vulnerabilities, cooperating with software developers for properly handling disclosure issues. 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