PT-2021-11992 · Union Pay · Union Pay

Published 2021-04-06 · Updated 2021-04-09 · CVE-2020-36285

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 3.3.12

Description: The issue allows attackers to shop for free in merchants' websites and mobile apps by generating a crafted authentication code (MAC) 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 3.3.12, update to a version that properly verifies cryptographic signatures to prevent exploitation. As a temporary workaround, consider implementing additional validation checks for authentication codes to minimize the risk of exploitation.

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2020-36285

Affected Products

Union Pay

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2020-36285 · Security Note
• https://osv.dev/vulnerability/CVE-2020-36285 · Vendor Advisory
• https://t.me/cvenotify/12764 · Telegram Post
• http://mobitec.ie.cuhk.edu.hk/cve_2020 · Note
• https://dropbox.com/s/czbkdr73tclq2nr/UnionPay_Vulnerability_Report.txt?dl=0 · Note
• https://dropbox.com/s/6smwnbrp0kgsgrc/poc_code.py?dl=0 · Note