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    "text": " Hi, everyone. My name is Feng Xiao from Georgia Tech. It seems like I'm the first DEF CON safe mode main talk, and I really hope everyone can enjoy attending my work. So this is, of course, not only my work, but also the work of my wonderful co-authors from Georgia Tech and Texas A&M. Today, I'm going to talk about some interesting new vulnerabilities in the Node.js ecosystems. Before the talk normally begins, please let me introduce myself a little more. I am a CS PhD student at Georgia Tech. My research goal is about building automatic systems to detect and exploit vulnerabilities. We want the tools to exploit vulnerabilities because we want the people to know the existence and the consequence of their security bugs. And I do research in the web and application security. But I'm also researching security problems in other areas, such as the software defining networks and x86 virtualizations. Okay, so this is the topic I'm going to cover today. The talk will be divided into three parts. First, I will introduce the technical details of the new vulnerabilities and discuss their exploitation. Then, I will talk more about the bug-finding parts, which is about the lessons and the insights from building one kind of a tool to detect and exploit HPA. And in the last part, I will give an impact analysis of the new risk and some evaluation data about the tools. So first of all, let's take a quick look at the vulnerabilities we found during our research. So in total, we discovered 13 zero-day vulnerabilities from widely used programs, such as MongoDB official drivers, class validators. And these bugs can be exploited to launch serious attacks, such as leaking credential data, bypassing security checks, and denial of services. So before we touch the technical details of these vulnerabilities, let's have a brief background introduction about Node.js. Node.js is for executing JavaScript code outside of browsers. The picture on the right is the overall system diagram of Node.js. To interrupt and execute JavaScript, the Node.js implements a runtime engine based on Chrome V8 to satisfy the needs of the server-side languages. The runtime engine also provides a set of API to let JavaScript interact with the host environments. By providing such APIs, the JavaScript code can access the host environments like any other server-side languages. For example, it can read and write file systems or execute system commands. So Node.js is pretty powerful. Nowadays, many websites are deploying Node.js. For example, Node.js are intensively used in companies like PayPal and LinkedIn. Also, we are all using a lot of electronic apps such as Skype or Skogs, Discord. And such electronic apps are also based on Node.js runtime. We've seen so many Node.js applications. The web-based apps are one of the most common types of Node.js programs. For those web-based applications, taking the communication data into object representations like JSON is pretty common. And this feature is convenient. For example, Node.js can use this feature to send and receive very complex data structure. From the monthly download statistic picture on the right, we can have an idea of how the object sharing is being supported and used by the Node.js ecosystems. The diagram demonstrates how the object sharing is being used in the Node.js ecosystem. There are two major methods of serialization of object data. The first is the query-stream-based serialization, and the second is the JSON-based serialization. As shown in the picture, if the user wants to update the age information in the Node.js web, he can send his data either via a standard query stream in the URL or a JSON stream in the request body. Upon receiving the request, the web application will convert the JSON data or the query stream data into an object so that the object can further propagate in the program logics. Okay, so basically this is how the object sharing is carried out in Node.js ecosystems. Usually, if we want to evaluate the security of such a program, we may want to inject different payloads into the age field so that we can try to trigger certain vulnerabilities such as SQL injections or cross-site scripts. However, what if we choose not to test the existing data field? Since we can pass an object into the program, what will happen if we inject additional properties that are not expected to be received by the server program? In particular, if an attacker can send the properties that forge or override the certain internal program states, the attacker may easily obtain dangerous abilities to manipulate the key program logics. So we are going to introduce the hidden property abusing, HPA. So the hidden property abusing leverages the object sharing in Node.js to tamper or forge critical program states. We call the additional properties we inject as the hidden properties because these properties are kind of like some hidden parameters which is valid to the endpoint user API. These parameters are associated with certain internal program states. However, nobody knows their existence until an attacker leverages HPA to tamper the states. In this talk, we mainly focus on the server-side scenarios where a remote attacker wants to attack the Node.js web applications or some microservices. To explore the vulnerabilities, the attacker will access the legitimate interfaces such as the web API endpoint to send his payloads. In most cases, the attacker payloads should be in the form of planned object, which is the simplest object representation in Node.js. During our research, we discovered two types of typical attack vectors of HPA. We call the first one as the app-specific attribute manipulation. This one is for manipulating certain internal properties defined by the application themselves. Search internal properties are supposed to be initialized and managed by their internal functions. However, they usually represent certain internal states of the programs. So as shown in the picture, the INIT row is an internal function that is responsible for maintaining the access right on the user object. However, with HPA, the attacker can propagate a conflicting name property to the user object. And thus control the internal states of the program. As shown in the picture, the program also provides an API called update. This is for external usage. However, if a malicious user injects additional key-value pair, which is access and admin in the picture to the API, then the additional properties will override the existing access right. So this payload is pretty useful when we want to abuse certain concrete logics in large applications, such as some older information or user-privileged any management logics. Also, HPA can target some unique JavaScript schemes, such as prototyping. We call the second attack scenarios as prototype inheritance hijacking. In JavaScript, every object has a link to a prototype object. When the JavaScript code wants to access a property of an object, the property will not only be searched on the object, but also the prototype of the object, and even the prototype of the prototype, until a property with a matching name is found. As shown in the picture, when the JavaScript code wants to get the constructor property from the input object, it will first search locally within the input object. Since there is no property named constructor here, the code will continually search to his prototype, where the constructor is really located. So with HPA, we can hijack the inheritance chain and forge our own payloads as the internal properties on the chain. As shown in the picture, if we inject a property named constructor, the search process will be very different. Since there is already a property named constructor within the input object, the search will immediately stop and end up with retaining a user-controlled value. As demonstrated in the red circle, the value of the constructor will become a string, rig and multi, rather than a normal JavaScript function. So the second attack vector is really useful because we found many JavaScript developers tend to trust the properties inherited from prototypes and make many security-sensitive decisions based on them. Also, we should be aware of the differences between these attack vectors with the prototype pollution. The two attacks are totally different. The prototype pollution, as the name suggests, is about tampering the prototype object. However, our attack vector does not modify the prototype object. The root cause of the HPA is that the Node.js fails to isolate the unsafe object, such as the user input, from the critical internal states. So, to make a clear classification, the HPA can be seen as a new security risk under the Common Weakness Category 915, whose child variants are all about improper modification of the dynamic object attributes. As shown in the hierarchy tree on the right, there are some similar issues on other language platforms, such as Ruby Math Assignment, the PHP Object Injections. Although these variants share the same behavior feature dominated by 915, they all have their own data patterns due to the language differences. For example, the Ruby Math Assignment is a set of vulnerabilities discovered in widely used Ruby web application framework called Ruby on Rails. Unlike HPA, the attacker does not pass objects into the program. Instead, the attacker abuses a framework-specific assignment feature in Ruby on Rails to modify certain existing objects on the right side of the assignment. And the payloads between the two attacks are also different. The Math Assignment payloads are literal value. However, HPA can introduce hidden properties with either literal value or nested object form. More importantly, the Ruby is strongly typed, so the Math Assignment vulnerabilities cannot introduce new properties to the objects. However, the HPA can inject arbitrary properties, which make HPA really flexible and powerful. OK, so with several pages of concept introduction, I think it's time we can hack some real targets. In this example, we target at a popular web framework named Routing Controller. We will attack its official example code to demonstrate an end-to-end prototype inheritance hijack exploit, from security check bypassing to cycle injection. The figure on the right can give you a brief idea on how our example works. In the example, a server program is deployed using Routing Controllers. If a remote user wants to authenticate with the server, his data will flow into the following components. First, he will send his serialized data into the authentication module. Then, the authentication module will instantiate the objects according to the JSON he provides and send it to the param handler. Here, we use the green box to demonstrate the user data objects. The param handler is responsible for ensuring user input object is not malicious. The handler will first collect internal format specification object, which is the blue box in the picture, and he will merge the specification with the input object and invoke the input validation API. The input validation API will sanitize the user input data according to the format specification. In this case, it will check if the email field is legitimate or not. If the check passes, the user object will flow into the database. Okay, so this is the overall data flow. Let's analyze how we can attack the logic step by step. So, the first step is the hidden property injection, in which the malicious attacker injects hidden properties in his request, which is the constructor in this case. As shown in the picture, when the server program instantiates the user object, there will be an additional property named the constructor, which is a payload for bypassing the input validation module. So, in the second step, the program will prepare the parameters needed by the input validation API. The server program will merge the user input, which is the param, with an object named the schema. The merging operation is carried out by putting every property from the param objects into the schema object. So, this process is very much like object assignment. To simplify the demonstration, let's just use object assignment in this example. By performing such merging operations, the hidden property constructor will also transform to the schema. And after the transformation, we now can hijack the inheritance of the constructor on the schema. Actually, the constructor of the schema plays a very important role in the input validation module. As shown in the picture, the constructor actually stores the important format restriction information. As a result, the merging operation enables us to hijack the inheritance of these important format restrictions. As shown in the picture, when the constructor is read by the getSchema function, our hidden property will be immediately matched and returned to the code. To bypass the input validation, we just need to set the format specification as an invalid value, so that our SQL injection payload can escape the check. Now, the last step is much more straightforward. The validate payload then flows into the sensitive API to finish the entire attack. So, this is how an entire HPA chain looks like. Actually, the code logics behind vulnerability is much more complex. For example, the input validation module contains 30,000 lines of code. So, it would be helpful if we can find a tool that automatically track these data structures and discover time for hidden properties exist in the program logics. So, what are the challenges of building such a tool? First of all, it is JavaScript. Analyzing JavaScript is known to be hard due to the dynamic nature. And second, HPA is a tech that creates unexpected and new data dependencies. However, program analysis, such as data flow tracking, is mainly for analyzing the existing flows. Third, from our run examples, we can observe that HPA tampers internal program states. So, the attack effects highly depend on the roles of the compromised states. This makes the detection more challenging. To overcome these challenges, we design and implement Lynx, a hybrid JavaScript program analysis tool, to detect and exploit HPA vulnerabilities. Lynx mainly consists of two components. The first component on the left is for identifying potential hidden properties. It combines dynamic data flow tracking and static synthetics analysis to track all the user input and infer potential candidates. And the component on the right is for detecting the harmful hidden properties and generating exploits for them. To help future Node.js security research, we decided to open-source our Lynx project at the GitHub links in the bottom. So, if you are interested in the technical details, you can check it in the GitHub report. So, the very first thing Lynx will do is dynamic data flow tracking. First of all, Lynx will generate a label object, which is a unique key and value piv. Lynx will inject the label into the input data of the program. Since different properties from the input object may flow into different program logics, we want to track all these propagations. So, we perform the label injection in a recursive manner. That is, as shown in the picture on the left, Lynx will generate three different inputs by label injecting the original test case. In each time, Lynx will inject the label into our different properties. After the injection, Lynx will observe the program execution. We leverage a JavaScript analysis framework called Jalanki to instrument our test programs. Since we are studying the data flow, we instrument the variable reads and writes, object property indexing and function calls. Then, we execute the test program. During the execution, Lynx will examine every object within the data flow. If an object can't carry our property labels, we will record it for further analysis. So now we have a list of property carriers. Record that an object is flagged as a property carrier because we detect our injected label under his body. So if we can propagate our label here, maybe we can also propagate another malicious property here also. More specifically, if we can inject a property that has a conflicting name with certain internal properties the program has, maybe we can control that property by overwriting them. So now we want to extract all the child properties from the original programs of the property carriers and flag them as hidden property candidates. To achieve this goal, we need static syntax analysis to extract the necessary syntactic information from the code. The picture on the right demonstrates how we parse our statement from our running example. Lynx will traverse the syntax tree until reaching a property carrier, which is circled by the red line in the graph. Then it records all the properties under the carrier. In our case, the hidden property candidate is the constructor. So here is an output screenshot of the first component. As you can observe, the Lynx will first instrument the code base, and then we tracked 43 property carriers. As indicated by the red circle, Lynx successfully detects a hidden property named constructor. So in the previous component, we discovered the key name of the potential hidden properties. By injecting the property with the same key, we might overwrite certain internal states. However, we still don't know whether the candidates can be controlled or not. And we also don't know how to introduce attack effects with these candidates. So apparently, Lynx could do more. Let's revisit our running example to see if there is any insights to help us to design such an exploitation component. The figure on the left is the vulnerable code from our running example. As we have discussed many times, hidden property tampers internal program states, which means HPA exploitation highly relates it to the code context. So it is important to conclude a set of vulnerable sensitive behaviors. These behaviors should clearly indicate certain security consequences, so that we can decouple the harmfulness detection from the code context. Also, from the running example, the exploitation is mainly about manipulating the return result. More specifically, there are two possible paths here. If the execution enters the branch on line 19, we will get a validation failed. But if we can go into the line 21, we can successfully pass the check. So the exploitation point and the override point may not be the same place, which means we shouldn't stop our analysis at line 11. Instead, we should continue exploring all the possible paths that can be triggered by manipulating the hidden properties. So we studied and concluded six general types of sensitive things. Due to the time constraint, I will not introduce the details of each type. If you want to know more, you can check our Git report. So after defining our sensitive things, we want the hidden property to trigger as many as possible branches, and monitor whether we can hit a sink. To achieve this goal, we use symbolic execution to explore all the hidden property value space. Lynx first generates an exploit template that can reach the potential hidden vulnerable property. We denote such data structure as an exploit template, because Lynx does not specify a concrete value in the input. Instead, we insert a special placeholder, which will be used by the symbolic execution later on. Then, we run the test program with our constructed templates, and symbolically execute the hidden property. As shown in the picture, the Lynx will explore all the path constraints along the input path, and if Lynx finds that it has hit a sink, for example, in this example, it hit the sink i2, then he will fetch the corresponding payload that can trigger the sink as the final exploit. So a little background about the sink i2 is the sink we define to detect that whether our input can manipulate the return value of a module or not. So this is the output of the exploit module. From the circled area, we can observe that the key value pair constructN1 triggered the sink i2. In the last line, we can find that the Lynx successfully bypassed the generator exploit that can lead to the successful validation. So this is pretty much about how our system works. Let's see some interesting new results of our research. During our research, we choose 60 widely used programs from Node NPM. There are 55 modules and 5 web applications. And with the help of Lynx, we tracked more than 1,300 carriers, and detected more than 300 hidden property candidates associated with those carriers. In the end, we confirmed 13 zero-day vulnerabilities. With the help of symbolic execution, Lynx even synthesized 10 exploits automatically. So how is the impact of these vulnerabilities? We found that HPA can introduce various attack effects, such as leaking credential data, denial of services, or bypassing security checks. Based on the impact analysis, we can observe that the HPA can compromise previously unreachable program states, which effectively enlarge the attack surface. Even more, we could notice that HPA is not a simple input validation issue, and many input validators themselves are also vulnerable to HPA. So in the following slides, I will pick up two interesting vulnerabilities from our results and case study them. So the first case comes from MongoDB official driver. We found that we can tamper an internal state named the BSON type. Our background here is that the MongoDB leveraged the internal state BSON type to indicate the data type of the query object. However, when serializing the query object, MongoDB will ignore the object with unknown BSON type. So what if we abuse the logic for a query condition object? The code on the right is from an open source online game. The online game used a vulnerable API to implement the user management logics. As shown in the picture, by injecting the unknown BSON type to the input, the attacker can force the MongoDB not serializing the query object condition, so that the MongoDB will always return the first user on top of the database. With this ability, the attacker can log in or delete arbitrary accounts. The second case is from another widely used in-memory database. The hidden property is more like a backdoor which helps the user accessing the sensitive data. In TafiDB, we discover a hidden property named id, which is an internal index for each database data item. Once we specify our own id in the query, TafiDB will ignore other query conditions and directly return the result associated with the index. As shown in the picture, even though we got wrong password and username, we can still leak the valid user data from the database with our crafted hidden properties. Thanks for attending our talk. I hope you guys keep safe in this special year."
}