L2Blocker Sensor setup screen vulnerable to authentication bypass


L2Blocker provided by SOFTCREATE CORP. contains a vulnerability (CWE-288) in which the login authentication is bypassed by using alternative paths or channels for Sensor.

Cyber Defense Institute, Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 5.4 (Medium) [IPA Score]
  • Attack Vector: Adjacent Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.8 (Medium) [IPA Score]
  • Access Vector: Adjacent Network
  • Access Complexity: Low
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

  • L2Blocker (on-premise) Ver4.8.5 and earlier
  • L2Blocker (Cloud) Ver4.8.5 and earlier

According the developer, EOS versions 3 series and ealier are also affected by this vulnerability.

An attacker who can access the device may perform an unauthorized login and obtain the stored information or cause a malfunction of the device.

[Update the Software]
Update to the latest version according to the information provided by the developer.
The developer released the following version that fixes the vulnerability.
  • L2Blocker Ver4.8.6

According the developer, L2Blocker(Cloud) has already been updated by the developer, therefore no user update is required.
Vendor Information

CWE (What is CWE?)

  1. Improper Authentication(CWE-287) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2022-33202

  1. JVN : JVN#51464799
Revision History

  • [2022/06/24]
      Web page was published