[Japanese]

JVNDB-2016-006114

The Bank of Tokyo-Mitsubishi UFJ for Android vulnerable to SSL/TLS downgrade attack

Overview

The Bank of Tokyo-Mitsubishi UFJ for Android may be exploited by SSL/TLS downgrade attack.

The Bank of Tokyo-Mitsubishi UFJ for Android provided by The Bank of Tokyo-Mitsubishi UFJ, Ltd. tries to communicate with a server via TLS v1.2. However, when a response from the server indicates SSL v3.0, communication is conducted via SSL v3.0 (CWE-757). As a result, the application may be exploited by POODLE attack.

CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
https://cwe.mitre.org/data/definitions/757.html

Reo Yoshida reported this vulnerability to JPCERT/CC, and JPCERT/CC coordinated with The Bank of Tokyo-Mitsubishi UFJ, Ltd.
CVSS Severity (What is CVSS?)

Base Metrics: 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: None
  • Availability Impact: None

CVSS V3 Severity:
Base Metrics: 3.7 (Low) [IPA Score]
  • Access Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: Low
  • Integrity Impact: None
  • Availability Impact: None
Affected Products


Bank of Tokyo-Mitsubishi UFJ
  • The Bank of Tokyo-Mitsubishi UFJ for Android ver5.3.1
  • The Bank of Tokyo-Mitsubishi UFJ for Android ver5.2.2 and earlier

Impact

A man-in-the-middle attack allows an attacker to eavesdrop on an encrypted communication.
Solution

[Update the Software]
Update to the latest version according to the information provided by The Bank of Tokyo-Mitsubishi UFJ, Ltd.
Vendor Information

Bank of Tokyo-Mitsubishi UFJ
CWE (What is CWE?)

  1. Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')(CWE-757) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2016-7812
References

  1. JVN : JVNVU#92900492
Revision History

[2016/12/08]
  Web page was published