DLA-3804-1: nghttp2 Security Advisory Updates

Welcome to our detailed coverage on the recent findings and updates surrounding the nghttp2 vulnerability. The digital security landscape is always evolving, and staying informed is key to maintaining the integrity and performance of internet protocols such as HTTP/2.

Recently, Bartek Nowotarskis highlighted a potential risk in the nghttp2 software, which plays a crucial role in implementing the HTTP/2 protocol—a faster, more secure version of the internet's HTTP protocol. This vulnerability, known under CVE ID CVE-2024-28182, primarily affects how the software handles specific types of data packages, called CONTINUATION frames, which are used to send extra header data.

nghttp2 versions before 1.61.0 exhibited a problem where these frames were continuously read—even after a stream was meant to be reset. This persistent reading was intended to keep the HPACK compression context in sync. However, this process led to an extensive use of CPU resources, potentially escalating to a Denial of Service (DoS) attack by enabling attackers to submit an excessive volume of these frames.

The nghttp2 team has addressed this issue in the latest release, version 1.61.0, by putting a cap on the number of CONTINUATION frames that can be processed within a single stream. This strategic change significantly mitigates the risk of DoS attacks stemming from this vulnerability, thereby enhancing the security and efficiency of HTTP/2 implementations using nghttp2.

For users and implementers of HTTP/2 via nghttp2, it’s crucial to update to version 1.61.0. Delaying this update could leave your systems susceptible to the described vulnerability, which has no other viable workaround. Hence, updating promptly is essential.

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In conclusion, staying current with version updates and security advisories is imperative in the rapidly evolving digital landscape. This ensures not only the performance but also the security of your digital infrastructures.