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Spring Framework, version 5.1, versions 5.0.x prior to 5.0.10, versions 4.3.x prior to 4.3.20, and older unsupported versions on the 4.2.x branch provide support for range requests when serving static resources through the
ResourceHttpRequestHandler, or starting in 5.0 when an annotated controller returns an
org.springframework.core.io.Resource. A malicious user (or attacker) can add a range header with a high number of ranges, or with wide ranges that overlap, or both, for a denial of service attack.
This vulnerability affects applications that depend on either spring-webmvc or spring-webflux. Such applications must also have a registration for serving static resources (e.g. JS, CSS, images, and others), or have an annotated controller that returns an
Spring Boot applications that depend on spring-boot-starter-web or spring-boot-starter-webflux are ready to serve static resources out of the box and are therefore vulnerable.
Users of affected versions should apply the following mitigation:
No further mitigation steps are necessary.
Note the following when evaluating the impact:
org.springfamework.core.io.Resourcefrom an annotated controller was introduced in 5.0. Therefore versions prior to 5.0 can only be impacted through a registration to serve static resources.
This issue was identified and responsibly reported by Nicholas Starke from Aruba Threat Labs.