Buffer overflows found in widely used server products are likely to become widely known and can pose a significant risk to users of these products. When web applications use libraries, such as a graphics library to generate images, they open themselves to potential buffer overflow attacks. Buffer overflows can also be found in custom web application code, and may even be more likely given the lack of scrutiny that web applications typically go through.
Buffer overflow flaws in custom web applications are less likely to be detected because there will normally be far fewer hackers trying to find and exploit such flaws in a specific application. If discovered in a custom application, the ability to exploit the flaw other than to crash the application is significantly reduced by the fact that the source code and detailed error messages for the application are normally not available to the hacker.
Almost all known web servers, application servers, and web application environments are susceptible to buffer overflows, the notable exception being environments written in interpreted languages like Java or Python, which are immune to these attacks except for overflows in the Interpretor itself.
For server products and libraries, keep up with the latest bug reports for the products you are using. For custom application software, all code that accepts input from users via the HTTP request must be reviewed to ensure that it can properly handle arbitrarily large input.
Keep up with the latest bug reports for your web and application server products and other products in your Internet infrastructure. Apply the latest patches to these products.
Periodically scan your web site with one or more of the commonly available scanners that look for buffer overflow flaws in your server products and your custom web applications. For your custom application code, you need to review all code that accepts input from users via the HTTP request and ensure that it provides appropriate size checking on all such inputs.
When a buffer overflow occurs in a program, it will often crash or become unstable. An attacker attempting to abuse a buffer overflow for a more specific purpose other than crashing the target system, can purposely overwrite important values in the call stack of the target machine such as the instruction pointer IP or base pointer BP in order to execute his or her potentially malicious unsigned code.
Operating system and software vendors often employ countermeasures in their products to prevent Buffer Overflow Attacks; particularly call stack and virtual memory randomization. Given the existence of such protective measures, Buffer Overflow Attacks have been rendered more difficult, although still possible to carry out. Our experts will answer your questions, assess your needs, and help you understand which products are best for your business.
Need to grow the business, retain customers and increase footprint. Need to protect against advanced security threats to minimize risk and support future innovation. Search for:. Register Now. Stack-based buffer overflows are more common, and leverage stack memory that only exists during the execution time of a function. Heap-based attacks are harder to carry out and involve flooding the memory space allocated for a program beyond memory used for current runtime operations. Developers can protect against buffer overflow vulnerabilities via security measures in their code, or by using languages that offer built-in protection.
Security measures in code and operating system protection are not enough. When an organization discovers a buffer overflow vulnerability, it must react quickly to patch the affected software and make sure that users of the software can access the patch.
The Imperva security solution is deployed as a gateway to your application and provide out-of-the-box protection for buffer overflow attacks. It does so by blocking illegal requests that may trigger a buffer overflow state, preventing them from reaching your applications. In addition to protecting against buffer overflow attacks, Imperva provides multi-layered protection to make sure websites and applications are available, easily accessible and safe.
The Imperva application security solution includes:. Buffer Overflow Attack What is Buffer Overflow Buffers are memory storage regions that temporarily hold data while it is being transferred from one location to another.
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