Union Pay up to 3.3.12 on iOS signature verification

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CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

A vulnerability classified as critical was found in Union Pay up to 3.3.12 on iOS (iOS App Software). Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a weak authentication vulnerability. The CWE definition for the vulnerability is CWE-347. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Union Pay up to 3.3.12, for iOS mobile apps, contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability, allows attackers to shop for free in merchants' websites and mobile apps, via a crafted authentication code (MAC) which is generated based on a secret key which is NULL.

The weakness was presented 04/07/2021. The advisory is shared at dropbox.com. This vulnerability is known as CVE-2020-36285 since 03/30/2021. The exploitation appears to be easy. Access to the local network is required for this attack. The requirement for exploitation is a single authentication. Technical details are unknown but a public exploit is available.

It is declared as proof-of-concept. It is possible to download the exploit at dropbox.com.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.5
VulDB Temp Score: 5.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Weak authentication
CWE: CWE-347
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
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Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

03/30/2021 CVE assigned
04/07/2021 +8 days Advisory disclosed
04/07/2021 +0 days VulDB entry created
04/10/2021 +3 days VulDB last update

Sourcesinfoedit

Advisory: dropbox.com
Status: Not defined

CVE: CVE-2020-36285 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfoedit

Created: 04/07/2021 07:35 AM
Updated: 04/10/2021 10:02 PM
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍

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