CVE-2018-12271: An issue was discovered in the com.getdropbox.Dropbox app 100.2 for iOS. The LAContext class for Biometric (TouchID) validation allows authentication ...

Description

An issue was discovered in the com.getdropbox.Dropbox app 100.2 for iOS. The LAContext class for Biometric (TouchID) validation allows authentication bypass by overriding the LAContext return Boolean value to be "true" because the kSecAccessControlUserPresence protection mechanism is not used. In other words, an attacker could authenticate with an arbitrary fingerprint. NOTE: the vendor indicates that this is not an attack of interest within the context of their threat model, which excludes iOS devices on which a jailbreak has occurred

Metrics

EPSS Probability

0.43%

34.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Dropbox	Dropbox	100.2

References

https://gist.github.com/tanprathan/6e8ed195a2e05b7f9d9a342dbdacb349Issue Tracking, Third Party Advisory, Tool Signature
https://hackerone.com/reports/363544Issue Tracking, Third Party Advisory
https://www.dropbox.com/s/n880ob3gtvfwryu/20180609_013320.mp4?dl=0Broken Link, Permissions Required
https://gist.github.com/tanprathan/6e8ed195a2e05b7f9d9a342dbdacb349Issue Tracking, Third Party Advisory, Tool Signature
https://hackerone.com/reports/363544Issue Tracking, Third Party Advisory
https://www.dropbox.com/s/n880ob3gtvfwryu/20180609_013320.mp4?dl=0Broken Link, Permissions Required

Timeline

Published: Jun 13, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-12271?

An issue was discovered in the com.getdropbox.Dropbox app 100.2 for iOS. The LAContext class for Biometric (TouchID) validation allows authentication bypass by overriding the LAContext return Boolean value to be "true" because the kSecAccessControlUserPresence protection mechanism is not used. In other words, an attacker could authenticate with an arbitrary fingerprint. NOTE: the vendor indicates that this is not an attack of interest within the context of their threat model, which excludes iOS devices on which a jailbreak has occurred

How severe is CVE-2018-12271?

Severity scoring for CVE-2018-12271 is pending analysis. The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.

How do I fix CVE-2018-12271?

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.

How Strix Helps

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