Home/CVE/PaperCut MF/NG Improper Access Control Vulnerability
CVE

CVE-2023-27350

PaperCut MF/NG Improper Access Control 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 the context of SYSTEM. Was ZDI-CAN-18987.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.94257 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

◆

Threat Actors Linked

3
actorAndariel
actorCl0p
actorFlax Typhoon
⬡

Weakness Classification

CWE-284Improper Access Control
▤

Affected Products & Versions

6
papercut mf>= 8.0 and < 20.1.7
papercut mf>= 21.0.0 and < 21.2.11
papercut mf>= 22.0.0 and < 22.0.9
papercut ng>= 8.0 and < 20.1.7
papercut ng>= 21.0.0 and < 21.2.11
papercut ng>= 22.0.0 and < 22.0.9
⚠

Public Exploits & PoCs

7
webappsPaperCut NG/MG 22.0.4 - Remote Code Execution (RCE)2023-05-23
webappsPaperCut NG/MG 22.0.4 - Authentication Bypass2023-04-25
nucleiPaperCut - Unauthenticated Remote Code Executioncritical
pocpacketstormsecurity.com · PaperCut-MF-NG-Authentication-Bypass-Remote-Code-Executio...packetstormsecurity.com
pocpacketstormsecurity.com · PaperCut-NG-MG-22.0.4-Authentication-Bypass.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · PaperCut-NG-MG-22.0.4-Remote-Code-Execution.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · PaperCut-PaperCutNG-Authentication-Bypass.htmlpacketstormsecurity.com
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT PaperCut MF/NG SetupCompleted Authentication Bypass (CVE-2023-27350)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalHacktool Execution - Imphash
relatedcriticalHackTool - Rubeus Execution
relatedcriticalPotential Credential Dumping Via LSASS Process Clone
relatedcriticalWCE wceaux.dll Access
relatedcriticalHackTool - Dumpert Process Dumper Default File
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · zdi-disclosures@trendmicro.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD20 Apr 2023 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

3
cisaKEV-CVE-2023-27350
splunk-security-content395163b8-689b-444b-86c7-9fe9ad624734
splunk-security-content9fcb214a-dc42-4ce7-a650-f1d2cab16a6a
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://news.sophos.com/en-us/2023/04/27/increased-exploitation-of-papercut-drawing-blood-around-the-internet/Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-23-233/Third Party AdvisoryVDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27350US Government Resource
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CVETechnique ActorTool Family
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