Union Pay up to 1.2.0 Shopping 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 was found in Union Pay up to 1.2.0. It has been rated as critical. This issue affects an unknown part of the component Shopping Handler. The manipulation with an unknown input leads to a weak authentication vulnerability. Using CWE to declare the problem leads to CWE-347. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Union Pay up to 1.2.0, for web based versions 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 released 04/07/2021. It is possible to read the advisory at dropbox.com. The identification of this vulnerability is CVE-2020-23533 since 08/13/2020. The exploitation is known to be easy. The attack needs to be done within the local network. A simple authentication is necessary for exploitation. Technical details are unknown but a public exploit is available.

It is declared as proof-of-concept. The exploit is available 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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CVSSv3infoedit

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: 🔍

CVSSv2infoedit

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: 🔍
Adversaries: 🔍
Geopolitics: 🔍
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Predictions: 🔍
Remediation: 🔍

Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

08/13/2020 CVE assigned
04/07/2021 +237 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-2020-23533 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfoedit

Created: 04/07/2021 07:33 AM
Updated: 04/10/2021 09:53 PM
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍

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