CVE-2021-3859 : Exploit Details and Defense Strategies
CVE-2021-3859 in Undertow triggers client-side invocation timeouts via specific HTTP2 calls, potentially enabling DoS attacks. Update to version 2.2.15.Final for mitigation.
A flaw was discovered in Undertow, leading to a client-side invocation timeout when specific calls were made via HTTP2. This vulnerability could be exploited by attackers to launch denial of service attacks.
Understanding CVE-2021-3859
Undertow encountered issues that triggered timeouts for client-side invocations, potentially enabling DoS attacks.
What is CVE-2021-3859?
CVE-2021-3859 is a vulnerability in Undertow that results in a client-side invocation timeout following certain HTTP2 calls, creating a potential avenue for DoS attacks.
The Impact of CVE-2021-3859
The vulnerability allows malicious actors to exploit Undertow's timeout mechanism, leading to denial of service scenarios that can disrupt services and impact system availability.
Technical Details of CVE-2021-3859
The technical aspects of the CVE-2021-3859 vulnerability.
Vulnerability Description
The flaw in Undertow triggers client-side invocation timeouts with specific HTTP2 calls, opening the door to DoS attack vectors.
Affected Systems and Versions
The issue affects Undertow versions up to 2.2.15.Final, with the vulnerability being resolved in this latest version.
Exploitation Mechanism
Attackers can exploit this vulnerability by making specific calls over HTTP2 to trigger client-side invocation timeouts, potentially leading to DoS incidents.
Mitigation and Prevention
Measures to address and prevent the exploitation of CVE-2021-3859.
Immediate Steps to Take
Organizations should update their Undertow installations to version 2.2.15.Final, the version that includes a fix for this vulnerability, to mitigate the risk of exploitation.
Long-Term Security Practices
Implementing secure coding practices and regularly updating software components can help maintain a robust security posture and reduce the likelihood of similar vulnerabilities.
Patching and Updates
Stay informed about security patches and updates for Undertow to promptly apply fixes for known vulnerabilities and enhance the overall security of the system.