CVE-2023-4818: a920 Injection — Exploit

Description

PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature is correctly checked and only bootloader signed by PAX can be used. The attacker must have physical USB access to the device in order to exploit this vulnerability.

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CVSS v3.1 Score

7.6

HIGH

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness Type (CWE)

CWE-74 CWE-74

Affected Products

Vendor	Product	Versions
paxtechnology	paydroid	All
paxtechnology	a920	All

References

Exploits

https://blog.stmcyber.com/pax-pos-cves-2023/ https://blog.stmcyber.com/pax-pos-cves-2023/

Other References

https://cert.pl/en/posts/2024/01/CVE-2023-4818/ https://cert.pl/posts/2024/01/CVE-2023-4818/ https://ppn.paxengine.com/release/development https://cert.pl/en/posts/2024/01/CVE-2023-4818/ https://cert.pl/posts/2024/01/CVE-2023-4818/ https://ppn.paxengine.com/release/development

Frequently Asked Questions

What is CVE-2023-4818? +

PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature is correctly checked and only bootloader signed by PAX can be used. The attacker must have physical USB access to the device in order to exploit this vulnerability. It has a CVSS v3.1 base score of 7.6 (HIGH).

How severe is CVE-2023-4818? +

CVE-2023-4818 has a CVSS v3.1 score of 7.6 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2023-4818? +

CVE-2023-4818 affects products from paxtechnology, specifically: a920, paydroid. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-4818? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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