LaLa Call App for Android fails to verify SSL server certificates


LaLa Call App for Android provided by K-Opticom Corporation fails to verify SSL server certificates.

Yuto Iso of NTT Security (Japan) KK 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 4.8 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.0 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

K-Opticom Corporation
  • LaLa Call App for Android ver2.4.7 and earlier


A man-in-the-middle attack may allow an attacker to eavesdrop on an encrypted communication.

[Update the Application]
Update to the latest version according to the information provided by the developer.
Vendor Information

K-Opticom Corporation
CWE (What is CWE?)

  1. No Mapping(CWE-Other) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2017-2103

  1. JVN : JVN#01014759
  2. National Vulnerability Database (NVD) : CVE-2017-2103
Revision History

  • [2017/02/03]
      Web page was published
      References : Content was added