SB2020012801 - Improper Certificate Validation in MyPallete app for Android
Published: January 28, 2020
Security Bulletin ID
SB2020012801
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Certificate Validation (CVE-ID: CVE-2020-5523)
The vulnerability allows a remote attacker to perform a man-in-the-middle attack.
The vulnerability exists due to the Android App "MyPallete" and some of the Android banking applications based on "MyPallete" fail to verify SSL server certificates and also do not properly validate certificates with host-mismatch. A remote attacker can supply a specially crafted SSL certificate, perform a man-in-the-middle attack and eavesdrop on an encrypted communication.
Remediation
Install update from vendor's website.
References
- https://jvn.jp/en/jp/JVN28845872/index.html
- http://www.dokodemobank.ne.jp/info_20200128_bankingapp.html
- https://www.77bank.co.jp/pdf/oshirase/20012801_appvulnerability.pdf
- https://www.ashikagabank.co.jp/appbanking/pdf/oshirase.pdf
- https://www.hokkaidobank.co.jp/common/dat/2020/0120/15795047141946146699.pdf
- https://www.hokugin.co.jp/info/archives/personal/2020/1913.html
- https://www.naganobank.co.jp/soshiki/2/app-ssl.html
- https://www.shikokubank.co.jp/info/apps20200128.html
- https://www.sihd-bk.jp/common_v2/pdf/20200127.pdf
- https://www.tohoku-bank.co.jp/news/topics/200128_applissl.html