Denial of Service in subtext

Background

subtext is an npm package that provides utilities for parsing and handling HTTP request payloads. It is used in web applications to process incoming data from clients. However, versions of subtext starting from 4.1.0 are vulnerable to a Denial of Service (DoS) attack. This vulnerability stems from a flaw in the Content-Encoding HTTP header parser, which can be exploited by an attacker to cause the application to throw a system error. If the error is not caught by an unhandled exception handler, the application will exit, resulting in a service shutdown.

Vulnerability Detail

The vulnerability in subtext arises from a weakness in the Content-Encoding HTTP header parser. When the header contains certain invalid values, the parser function throws a system error. Since hapi, the framework used by subtext, rethrows system errors instead of catching expected application errors, the error propagates up the stack. If the application does not have an unhandled exception handler, the error will cause the application to terminate, enabling an attacker to disrupt services. This vulnerability has a high severity rating.

Workaround

There is no specific workaround mentioned for this vulnerability. However, updating to the latest version of subtext is the recommended solution.

Conclusion

The vulnerability in subtext can be exploited to cause a Denial of Service attack, resulting in the shutdown of affected services. To mitigate this vulnerability, it is crucial to update the dependencies of your application to use the latest version of subtext (@hapi/subtext). For further assistance and support in vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for subtext →

FAQ