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PaperCut NG Unauthenticated File Upload

High

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

June 13, 2023 - Tenable attempts to obtain security contact from vendor.
June 15, 2023 - Vendor supplies communication method. Tenable discloses issue to vendor.
June 16, 2023 - Vendor provides status update.
June 23, 2023 - Vendor provides status update.
June 27, 2023 - Vendor provides status update.
June 30, 2023 - Tenable acknowledges.
July 19, 2023 - Vendor requests clarification of publication details. Tenable provides details.
July 20, 2023 - Vendor requests delay of PoC publication. Tenable agrees and provides an advisory draft.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2023-3486
Tenable Advisory ID: TRA-2023-23
CVSSv3 Base / Temporal Score:
8.2 / 7.4
CVSSv3 Vector:
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Affected Products:
PaperCut NG prior to 22.1.3
Risk Factor:
High

Advisory Timeline

July 25, 2023 - Initial release.
August 28, 2023 - Added PoC information.