CVE-2023-27350
PaperCut — PaperCut MF/NG Improper Access Control Vulnerability
PaperCut · CWE-284 · in CISA KEV since 2023-04-21
EVRS 94 of 100 Immediate
Out-of-Band / Urgent Remediation
Rank 26 of 2,960 tracked
Why it scores 94
Evidence available: 6 of 7 signalsListed in the CISA KEV catalog, and associated with known ransomware campaigns.
- CISA KEVApplied
- RansomwareApplied
- Vendor exploitationDid not apply
- EPSSApplied
- Microsoft Exploitability IndexNot applicable
- Pre-patch disclosureNo data
- KEV recencyDid not apply
- CVSSApplied
The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data
Fix
Patch or fixed version identifiedCISA required action
Fixed in
papercut mf: update to 20.1.7 or later | papercut mf: update to 21.2.11 or later | papercut mf: update to 22.0.9 or later | papercut ng: update to 20.1.7 or later | papercut ng: update to 21.2.11 or later | papercut ng: update to 22.0.9 or later
Affected versions
- papercut mf
>= 8.0 < 20.1.7>= 21.0.0 < 21.2.11>= 22.0.0 < 22.0.9 - papercut ng
>= 8.0 < 20.1.7>= 21.0.0 < 21.2.11>= 22.0.0 < 22.0.9
Remediation
Apply updates per vendor instructions.
Fixed versions from NVD.
Evidence
Each value with its source| Measure | Value | Source |
|---|---|---|
| CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. | 9.8 | NVD |
| FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. | 0.999 (99.99th pctl) | FIRST EPSS |
| Actively exploitedWhether a source of record has confirmed attacks using it in the wild. | Confirmed | CISA KEV |
| Ransomware campaign useWhether CISA has seen ransomware operators use it. | Known | CISA KEV |
| CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. | 2023-05-12 · KEV since 2023 · listed over a year | CISA KEV |
| Public exploit moduleA module existing is not the same as active exploitation. | Public module exists | Metasploit |
| EUVD cross-referenceENISA's record: CVSS 9.8 (v3.0), assigned by zdi. | Listed | ENISA EUVD |
Description
NVDThis 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 the context of SYSTEM. Was ZDI-CAN-18987.
What CISA says to do
Public module
Metasploit lists a public excellent-rank module for this CVE: PaperCut PaperCutNG Authentication Bypass (multi/http/papercut_ng_auth_bypass). A module existing is not the same as active exploitation; see metasploit.com.