HTTP/2 DoS via Stream Reset in nginx
CVE-2023-44487 Published on October 10, 2023
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
Known Exploited Vulnerability
This HTTP/2 Rapid Reset Attack Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).
The following remediation steps are recommended / required by October 31, 2023: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vulnerability Analysis
CVE-2023-44487 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2023-44487 has been classified to as a Resource Exhaustion vulnerability or weakness.
Products Associated with CVE-2023-44487
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Vulnerable Packages
The following package name and versions may be associated with CVE-2023-44487
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| maven | io.netty:netty-codec-http2 | < 4.1.100.Final | 4.1.100.Final |
| maven | io.netty:netty-codec-http2 | >= 4.2.0.Alpha1, <= 4.2.3.Final | 4.2.4.Final |
| maven | io.netty:netty-codec-http2 | <= 4.1.123.Final | 4.1.124.Final |
| maven | org.eclipse.jetty.http2:http2-common | >= 9.3.0, <= 9.4.57 | 9.4.58 |
| maven | org.eclipse.jetty.http2:http2-common | >= 10.0.0, <= 10.0.25 | 10.0.26 |
| maven | org.eclipse.jetty.http2:http2-common | >= 11.0.0, <= 11.0.25 | 11.0.26 |
| maven | org.eclipse.jetty.http2:jetty-http2-common | >= 12.0.0, <= 12.0.24 | 12.0.25 |
| maven | org.eclipse.jetty.http2:jetty-http2-common | >= 12.1.0.alpha0, <= 12.1.0.beta2 | 12.1.0.beta3 |
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.