PT-2021-10906 · Union Pay · Union Pay

Published 2021-04-06 · Updated 2022-11-05 · CVE-2020-23533

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions Union Pay versions up to 1.2.0

Description The issue allows attackers to shop for free in merchants' websites and mobile apps via a crafted authentication code (MAC) generated based on a secret key which is NULL. This is due to an improper verification of cryptographic signature.

Recommendations For Union Pay versions up to 1.2.0, update to a version later than 1.2.0 to resolve the issue. As a temporary workaround, consider implementing additional validation checks for the authentication code (MAC) to prevent exploitation. Restrict access to the vulnerable web-based versions to minimize the risk of exploitation.

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2020-23533

Affected Products

Union Pay

References · 7

• https://osv.dev/vulnerability/CVE-2020-23533 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-23533 · Security Note
• http://mobitec.ie.cuhk.edu.hk/cve_2020 · Note
• https://dropbox.com/s/czbkdr73tclq2nr/UnionPay_Vulnerability_Report.txt?dl=0 · Note
• https://cwe.mitre.org/data/definitions/347.html · Note
• https://dropbox.com/s/6smwnbrp0kgsgrc/poc_code.py?dl=0 · Note
• https://t.me/cvenotify/37108 · Telegram Post