Published at DZone with permission of Ian Muscat, DZone MVB. The above request will cause the application to connect to localhost on port 11211 and send the string “stat”. For more information, see our Privacy Statement. An attacker takes advantage of the access rights of the target server to perform a broad array of unauthorized actions. r/netsec: A community for technical news and discussion of information security and closely related topics. Server-Side Request Forgery vulnerabilities could provide an attacker with the opportunity to access some of these services without any authentication standing in the way. In this article, we explore the concept of Server-Side Request Forgery (SSRF), what kind of is vulnerable to SSRF attacks, and best practices to prevent them. We use essential cookies to perform essential website functions, e.g. This approach has serious shortcomings because it is not 100% reliable, so it will miss some SSRF vulnerabilities. Therefore, it’s best to enable authentication wherever possible as another defense mechanism. Furthermore, some applications might have a need to take inputs and use them to create subsequent requests. The following is an example in PHP that is vulnerable to Server-Side Request Forgery (SSRF). Server Side Request Forgery is a serious application security risk and a candidate to become part of the next edition of the OWASP Top 10 ranking. We hope that this deep dive into Server Side Request Forgery was useful. Regarding SSRF, WAFs might try to find specific URLs or IP patterns that should not be part of a regular request. Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g. In a SSRF attack the attacker can change a parameter used on the web application to create or control requests from the vulnerable server. In this blog post I’ll review the technical details of SSRF, how it was utilized in the Capital One breach, why it’s so critical to understand for today’s cloud-hosted web apps, and how organizations can protect … A SSRF occurs when the application includes a component that takes untrusted input to fetch a server resource and it does not perform security validations. Acunetix solves this by making use of AcuMonitor as its intermediary service during an automated scan. However, it is better not to rely on the human factor and also incorporate automatic validation tools to ensure that all code is free of SSRF vulnerabilities at all times. The CapitalOne breach in 2019 is one of the most well known and damaging cases of SSRF. By combining static visibility with real-time runtime visibility, a RASP can be very efficient in detecting Server Side Request Forgery. Get latest developments in web application security, DevSecOps, and cloud security from the Hdiv Security blog. If your application only makes use of HTTP or HTTPS to make requests, only allow those URL schemas. In sum, since a WAF is external and does not see what the application does with the input data, it is impossible to ensure 100% SSRF protection. The Hdiv Security unified application security platform covers extensively this risk, both from a code fix point of view and also from attack blocking point of view: Hdiv Detection, a passive IAST, finds all occurrences of Server Side Request Forgery vulnerabilities in the code, from the very beginning. Services such as Memcached, Redis, Elasticsearch, and MongoDB do not require authentication by default. Apart from the http:// and https:// URL schemas, an attacker may take advantage of lesser-known or legacy URL schemas to access files on the local system or on the internal network.

Server-Side Request Forgery (SSRF) refers to an attack wherein an attacker is able to send a crafted request from a vulnerable web application. If the RASP detects a malicious payload reaching a vulnerable piece of code, it will identify the attack and block the exploitation of the vulnerability. Some applications store images and other resources in the server filesystem. It led to the disclosure of over 100 million client records. Determine type of you SSRF combination: Direct socket access (such as this e xample ) Sockets client (such as java URI, cURL, LWP, others) 5.

SSRF is a great example of the advantages of observing the applications in runtime, from the inside. This leads to SSRF. SSRF: What is Server Side Request Forgery? SSRF and CapitalOne breach Because of this open-loop, read operations are not immediate, but blind attacks can be used easily to conduct write operations for which the attacker does not need to see the response. Normally, the attacker uses a client-side proxy, such as OWASP ZAP to capture the traffic, and modify the values of the parameters, and based on clues on the error messages and responses, guess what points are potentially vulnerable. Ensuring that the response received by the remote server is indeed what the server is expecting is important to prevent any unforeseen response data leaking to the attacker. The Overflow Blog Podcast 268: How developers can become great writers. This means that there is no need to validate all the input, but only those pieces that reach a critical code hotspot. Port 11211 is the default port used by Memcached, which is not normally exposed. DevSecOps: The 7 Key Factors To Secure Your DevOps Practice, The difference between active IAST and passive IAST. A crafty attacker will be able to forge non-web payloads involving protocols such as ftp, smtp, and smb. SSRF attack protection Hdiv Protection will also help to manage non-web protocols such as ftp, so the team can decide what’s allowed and what’s not.

There is no validation. As applications gain modularity and complexity, the reliance on external services increases. * The default setting of followRedirects is true. For example, it’s possible for an attacker to access services on localhost. In this case, bypass by an attacker is as easy as using an HTTP redirect, a wildcard DNS service such as xip.io, or even alternate IP encoding. The morphology of the attack and the particular payload structure will greatly depend on whether it is a basic vs blind, as well as on the intended action.

Blind Server Side Request Forgery exploits do not return a response to the attacker. Typically Server-Side Request Forgery (SSRF) occurs when a web application is making a request, where an attacker has full or partial control of the request that is being sent. Examples of these actions are browsing server private directories, remote execution of code in the target server, accessing local machines behind the network firewall (port scans), and many others.

Instead, the most robust way of dealing with Server-Side Request Forgery (SSRF) is to whitelist the DNS name or IP address which your application needs access to. The following is the result of an Acunetix scan with AcuMonitor to detect Server-Side Request Forgery (SSRF). For each request, a RASP has the ability to follow all the input data and examine in real-time what the application is doing with this data. However, although Fortify is known for false positives, I have not seen it make that type of mistake (i.e. In case of sockets client, determine available U RI schemas 7. SSRF is a dangerous web vulnerability caused by bad programming. The SSRF acronym stands for “Server-Side Request Forgery,” as the attacker forces the server (forging) to perform malicious unintended requests.

You can always update your selection by clicking Cookie Preferences at the bottom of the page. Disabling unused URL schemas will prevent a web application from making requests using potentially dangerous URL schemas such as file:///, dict://, ftp:// and gopher://. Server Side Request Forgery example

| Privacy Policy | Cookie Policy, Detect vulnerable points insight into application logic, Enable applications to protect themselves, Improve the productivity of business logic flaws detection, Open-source application security framework, Helping organizations to achieve regulatory compliance, Learn about web application security and DevSecOps, Contribute to promote application security, the difference between active and passive IASTs in this other post, SSRF Vulnerability detection and mitigation, Hdiv Security detects and protects the SSRF Risk, What is IAST? This represents an insecure direct object reference risk, as well. However, a static view of the application is highly inaccurate since the untrusted input parameters could follow a complicated dynamic path that it is hard to disentangle by just looking at the source code. See the original article here. SSRF Class URLConnectionVuln Method URLConnectionSec Method httpURLConnection Method request Method openStream Method ImageIO Method okhttp Method HttpClient Method commonsHttpClient Method Jsoup Method IOUtils Method HttpSyncClients Method. This eliminates the risk of exploiting the functionality while allowing the developers the ability to introduce certain application behaviors. Perimeter defenses such as WAFs rely on blacklists and pattern matching to guess what activities constitute attacks. java-sec-code / src / main / java / org / joychou / controller / SSRF.java / Jump to. The SSRF exploits are not limited to web access. They are similar to APIs, but simpler and more standardized. Depending on how the application is making the request, URL schemas other than file and HTTP could be available to the attacker to use. To increase the efficiency and the accuracy of the protection, Hdiv Protection will only monitor payloads in the points of the application that actually are vulnerable to Server Side Request Forgery. Implementing simple blacklists or regular expressions directly on the user’s input to filter out which IP addresses or domains can make requests is a bad approach to take when mitigating an SSRF. Another bypass tactic is to take advantage when the application combines the values of different input parameters. Server Side Request Forgery is easy to understand by seeing a code example. For an example of an SSRF attack, read more about the Capital One breach. Learn more about the difference between active and passive IASTs in this other post. Additionally, the access roles were too permissive, which represents an additional security misconfiguration vulnerability. The CapitalOne AWS SSRF vulnerability allowed the attacker to obtain AWS credentials using the application server itself as a “jumping stone”, because AWS allows the application to obtain its own metadata. In general, blacklists are a poor security control because there will always be bypasses not envisaged by a developer. From the point of view of the API, the origin of the request is the SSRF-compromised server, which opens the door to abuse. The user uploads a picture, and it is placed in a separate storage service, such as an S3 bucket.

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