CVE-2023-27350 on CISA KEV

This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SetupCompleted class. The issue results from improp

01What CISA says about this vulnerability

This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SetupCompleted class. The issue results from improper access control. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in…

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• www.zerodayinitiative.com — https://www.zerodayinitiative.com/advisories/ZDI-23-233/
• www.papercut.com — https://www.papercut.com/kb/Main/PO-1216-and-PO-1219
• packetstormsecurity.com — http://packetstormsecurity.com/files/171982/PaperCut-MF-NG-Authentication-Bypass…
• packetstormsecurity.com — http://packetstormsecurity.com/files/172022/PaperCut-NG-MG-22.0.4-Authentication…
• news.sophos.com — https://news.sophos.com/en-us/2023/04/27/increased-exploitation-of-papercut-draw…
• packetstormsecurity.com — http://packetstormsecurity.com/files/172512/PaperCut-NG-MG-22.0.4-Remote-Code-Ex…
• packetstormsecurity.com — http://packetstormsecurity.com/files/172780/PaperCut-PaperCutNG-Authentication-B…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
PaperCut	NG	22.0.5 (Build 63914)

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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