JVNVU#92900492
三菱東京ＵＦＪ銀行 for Android vulnerable to SSL/TLS downgrade attack
Overview
三菱東京ＵＦＪ銀行 for Android may be exploited by SSL/TLS downgrade attack.
Products Affected
- 三菱東京ＵＦＪ銀行 for Android ver5.3.1
- 三菱東京ＵＦＪ銀行 for Android ver5.2.2 and earlier
Description
三菱東京ＵＦＪ銀行 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.
CVE-2016-7812 is assigned to this issue. The scope of this identifier is limited to 三菱東京ＵＦＪ銀行 for Android only.
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 Status
| Vendor | Link |
| The Bank of Tokyo-Mitsubishi UFJ, Ltd. | 三菱東京ＵＦＪ銀行 - Android Apps on Google Play |
References
JPCERT/CC Addendum
Vulnerability Analysis by JPCERT/CC
| Attack Vector(AV) | Physical (P) | Local (L) | Adjacent (A) | Network (N) |
|---|---|---|---|---|
| Attack Complexity(AC) | High (H) | Low (L) | ||
| Privileges Required(PR) | High (H) | Low (L) | None (N) | |
| User Interaction(UI) | Required (R) | None (N) | ||
| Scope(S) | Unchanged (U) | Changed (C) | ||
| Confidentiality Impact(C) | None (N) | Low (L) | High (H) | |
| Integrity Impact(I) | None (N) | Low (L) | High (H) | |
| Availability Impact(A) | None (N) | Low (L) | High (H) |
| Access Vector(AV) | Local (L) | Adjacent Network (A) | Network (N) |
|---|---|---|---|
| Access Complexity(AC) | High (H) | Medium (M) | Low (L) |
| Authentication(Au) | Multiple (M) | Single (S) | None (N) |
| Confidentiality Impact(C) | None (N) | Partial (P) | Complete (C) |
| Integrity Impact(I) | None (N) | Partial (P) | Complete (C) |
| Availability Impact(A) | None (N) | Partial (P) | Complete (C) |
Comment
This analysis assumes a man-in-the-middle attack being conducted by an attacker that places a malicious wireless LAN access point.
Credit
Reo Yoshida reported this vulnerability to JPCERT/CC, and JPCERT/CC coordinated with The Bank of Tokyo-Mitsubishi UFJ, Ltd.
Other Information
| JPCERT Alert |
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| JPCERT Reports |
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| CERT Advisory |
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| CPNI Advisory |
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| TRnotes |
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| CVE |
CVE-2016-7812 |
| JVN iPedia |
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Update History
- 2016/12/09
- Explanation regarding CVE identifier was added to the section under [Description].