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CVE-2020-7958

MEDIUMCVSS 6/10EPSS 0.58%

Last modified

CVE-2020-7958 is a medium-severity vulnerability rated 6/10 on the CVSS scale. An issue was discovered on OnePlus 7 Pro devices before 10.0.3.GM21BA. The firmware was found to contain functionality that allows a privileged user (root) in the Rich Execution Environment (REE) to obtain bitmap images from the fingerprint sensor because of Leftover Debug Code. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

An issue was discovered on OnePlus 7 Pro devices before 10.0.3.GM21BA. The firmware was found to contain functionality that allows a privileged user (root) in the Rich Execution Environment (REE) to obtain bitmap images from the fingerprint sensor because of Leftover Debug Code. The issue is that the Trusted Application (TA) supports an extended number of commands beyond what is needed to implement a fingerprint authentication system compatible with Android. An attacker who is in the position to send commands to the TA (for example, the root user) is able to send a sequence of these commands that will result in the TA sending a raw fingerprint image to the REE. This means that the Trusted Execution Environment (TEE) no longer protects identifiable fingerprint data from the REE.

Metrics

CVSS 3.1
6/10

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

EPSS Probability
0.58%

43.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
OneplusOneplus 7 Pro Firmware< 10.0.3.gm21ba

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-7958?
An issue was discovered on OnePlus 7 Pro devices before 10.0.3.GM21BA. The firmware was found to contain functionality that allows a privileged user (root) in the Rich Execution Environment (REE) to obtain bitmap images from the fingerprint sensor because of Leftover Debug Code. The issue is that the Trusted Application (TA) supports an extended number of commands beyond what is needed to implement a fingerprint authentication system compatible with Android. An attacker who is in the position to send commands to the TA (for example, the root user) is able to send a sequence of these commands that will result in the TA sending a raw fingerprint image to the REE. This means that the Trusted Execution Environment (TEE) no longer protects identifiable fingerprint data from the REE.
How severe is CVE-2020-7958?
CVE-2020-7958 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.
How do I fix CVE-2020-7958?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-7958?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST