webeasy

Angry Storage

web-kids20

Task: File storage service with slow processing and file deletion after upload. Solution: Race condition exploit - upload PHP webshell and access it before deletion during the processing time window.

$ ls tags/ techniques/

php race_condition file_upload webshell temporary_file

webshell_uploadfile_upload_race_conditiontemporary_file_access

Analysis

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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