Vulnerability CVE-2020-5523
Published: 2020-01-28

Description:
Android App 'MyPallete' and some of the Android banking applications based on 'MyPallete' do not verify X.509 certificates from servers, and also do not properly validate certificates with host-mismatch, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Type:

CWE-295

 (Certificate Issues)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5.8/10
4.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
Tohoku-bank -> Tougin 
Sihd-bk -> Ikeda senshu bank 
Shikokubank -> Shikoku bank 
Nttdata -> Mypallete 
Naganobank -> Nagagin 
Hokugin -> Hokuriku bank portal 
Hokkaidobank -> Dogin 
Ashikagabank -> Ashigin 
77bank -> 77 bank 

 References:
http://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
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