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CVE-2021-23937— DNS proxy and possible amplification attack

Quick assessment

Affected
Apache Software Foundation Apache Wicket
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Wicket是美国阿帕奇（Apache）基金会的一套开源、轻量、基于组件的框架，它提供了一种面向对象的方式来开发基于Web的动态UI应用程序。 Apache Wicket存在信息泄露漏洞，该漏洞源于Apache Wicket的WebClientInfo中的DNS代理和可能的放大攻击漏洞允许攻击者可利用该漏洞在x - forward - for报头没有被正确清除时从服务器触发任意的DNS查找。这种DNS查找可以使内部DNS服务器过载，或者降低Apache Wicket应用程序的请求处理速度，从

AI Predicted 7.5 Difficulty: Easy EPSS 4.26% · P90
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I. Basic Information for CVE-2021-23937

Vulnerability Information
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Vulnerability Title
DNS proxy and possible amplification attack
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Wicket 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Wicket是美国阿帕奇（Apache）基金会的一套开源、轻量、基于组件的框架，它提供了一种面向对象的方式来开发基于Web的动态UI应用程序。 Apache Wicket存在信息泄露漏洞，该漏洞源于Apache Wicket的WebClientInfo中的DNS代理和可能的放大攻击漏洞允许攻击者可利用该漏洞在x - forward - for报头没有被正确清除时从服务器触发任意的DNS查找。这种DNS查找可以使内部DNS服务器过载，或者降低Apache Wicket应用程序的请求处理速度，从
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Wicket Apache Wicket 9.x ~ 9.2.0 -

II. Public POCs for CVE-2021-23937

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III. Intelligence Information for CVE-2021-23937

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Mailing List Discussions for CVE-2021-23937 (4)

IV. Related Vulnerabilities

Same product: Apache Wicket
Same vendor: Apache Software Foundation

V. Comments for CVE-2021-23937

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