Spring Security Misconfiguration: Overly Permissive Firewall Policy

Java/JSP

Abstract

Spring Security HTTP 防火墙配置了 lax 策略。

Explanation

Spring Security 包括 HTTP 防火墙，可通过清理可能包含恶意字符的请求保护应用程序的安全。Spring 通过将 HttpFirewall 包含在其 FilterChainProxy 中实现此功能，其会借助过滤链发送预先处理过的请求。默认情况下，Sprint Security 使用 StrictHttpFirewall 实施。

示例 1：以下代码会放宽防火墙策略以允许 %2F 和 ; 字符：


    <beans:bean id="httpFirewall" class="org.springframework.security.web.firewall.StrictHttpFirewall" p:allowSemicolon="true" p:allowUrlEncodedSlash="true"/>

若这些字符未得到一致和正确的处理，允许潜在的恶意字符会导致漏洞。例如，允许使用分号会启用路径参数（根据 RFC 2396 中的定义），该参数未得到前端 Web 服务器（Apache Tomcat 等 nginx 和应用程序服务器）的一致处理。这些不一致可能会被 Path Traversal 攻击利用或用于绕过 Access Control。

References

[1] Class DefaultHttpFirewall Spring

[2] Standards Mapping - FIPS200 CM

[3] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data

[4] Standards Mapping - NIST Special Publication 800-53 Revision 4 CM-6 Configuration Settings (P1)

[5] Standards Mapping - NIST Special Publication 800-53 Revision 5 CM-6 Configuration Settings

[6] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration

[7] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls

[8] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management

[9] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration

[10] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration

[11] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration

[12] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration

[13] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10

[14] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.4.1

[15] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.4.1

[16] Standards Mapping - Web Application Security Consortium Version 2.00 Server Misconfiguration (WASC-14)

desc.config.java.spring_security_misconfiguration_overly_permissive_firewall_policy