Auth bypass in Dropbox
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
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (34.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Dropbox — versions 100.2
Weakness classification (CWE)
References
- www.dropbox.com/s/n880ob3gtvfwryu/20180609_013320.mp4 (Permissions Required, Broken Link)
- hackerone.com/reports/363544 (Third Party Advisory, Issue Tracking)
- gist.github.com/tanprathan/6e8ed195a2e05b7f9d9a342dbdacb349 (Third Party Advisory, Issue Tracking, Tool Signature)
Frequently asked questions
- What is CVE-2018-12271?
- CVE-2018-12271 is a medium-severity vulnerability in Dropbox, classified under Improper Authentication. CVSS score: 6.4/10. Published 2018-06-13.
- How severe is CVE-2018-12271?
- Medium severity. CVSS v3 base score is 6.4 out of 10.