Improper Certificate Validation in MyPallete app for Android
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2020-5523 |
| CWE-ID | CWE-295 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
MyPallete Mobile applications / Apps for mobile phones Ashigin app Mobile applications / Apps for mobile phones Ikeda Senshu Bank Banking App Mobile applications / Apps for mobile phones Shikoku Bank App Mobile applications / Apps for mobile phones Tougin app Mobile applications / Apps for mobile phones Nagagin app Mobile applications / Apps for mobile phones 77 Bank Application Mobile applications / Apps for mobile phones Dogin app Mobile applications / Apps for mobile phones Hokuriku Bank Portal App Mobile applications / Apps for mobile phones |
| Vendor |
NTT DATA Corporation The Ashikaga Bank, Ltd. The Senshu Ikeda Bank, Ltd. The Shikoku Bank, Ltd. The Tohoku Bank, Ltd. THE NAGANO BANK, LTD. The 77 bank, Ltd. The Hokkaido Bank,Ltd. Hokuriku Bank, Ltd. |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Improper Certificate Validation
EUVDB-ID: #VU24687
Risk: Medium
CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-5523
CWE-ID:
CWE-295 - Improper Certificate Validation
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website released on January 28, 2020.
Vulnerable software versionsMyPallete: All versions
Ashigin app: 1.0.4
Ikeda Senshu Bank Banking App: 3.0.4
Shikoku Bank App: 2.0.1
Tougin app: 1.0.1
Nagagin app: 1.0.1
77 Bank Application: 2.0.1
Dogin app: 3.0.1
Hokuriku Bank Portal App: 2.0.1
External linkshttp://jvn.jp/en/jp/JVN28845872/index.html
http://www.dokodemobank.ne.jp/info_20200128_bankingapp.html
http://www.77bank.co.jp/pdf/oshirase/20012801_appvulnerability.pdf
http://www.ashikagabank.co.jp/appbanking/pdf/oshirase.pdf
http://www.hokkaidobank.co.jp/common/dat/2020/0120/15795047141946146699.pdf
http://www.hokugin.co.jp/info/archives/personal/2020/1913.html
http://www.naganobank.co.jp/soshiki/2/app-ssl.html
http://www.shikokubank.co.jp/info/apps20200128.html
http://www.sihd-bk.jp/common_v2/pdf/20200127.pdf
http://www.tohoku-bank.co.jp/news/topics/200128_applissl.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to perform certain actions on the device.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
