CVE-2021-23937: DNS proxy and possible amplification attack
A DNS proxy and possible amplification attack vulnerability in WebClientInfo of Apache Wicket allows an attacker to trigger arbitrary DNS lookups from the server when the X-Forwarded-For header is not properly sanitized. This DNS lookup can be engineered to overload an internal DNS server or to slow down request processing of the Apache Wicket application causing a possible denial of service on either the internal infrastructure or the web application itself. This issue affects Apache Wicket Apache Wicket 9.x version 9.2.0 and prior versions; Apache Wicket 8.x version 8.11.0 and prior versions; Apache Wicket 7.x version 7.17.0 and prior versions and Apache Wicket 6.x version 6.2.0 and later versions.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2021-23937?
CVE-2021-23937 is considered to have a medium severity due to its potential for exploitation through DNS amplification attacks.
How do I fix CVE-2021-23937?
To fix CVE-2021-23937, upgrade Apache Wicket to versions 7.18.0, 8.12.0, or 9.3.0 or higher.
What versions of Apache Wicket are affected by CVE-2021-23937?
CVE-2021-23937 affects Apache Wicket versions prior to 7.18.0, 8.12.0, and 9.3.0.
Can CVE-2021-23937 be exploited without access to the internal network?
Yes, CVE-2021-23937 can be exploited remotely if the application is configured to trust the X-Forwarded-For header without proper validation.
What are the potential impacts of CVE-2021-23937?
The potential impacts of CVE-2021-23937 include increased load on the internal DNS server and possible service disruption.