Arbitrary file upload in Apple macOS
CVE-2021-40531
Sketch before 75 allows library feeds to be used to bypass file quarantine. Files are automatically downloaded and opened, without the com.apple.quarantine extended attribute. This results in remote code execution, as demonstrated by CommandString in a terminal profile to Terminal.app.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.328 (98.3th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.328 · newest: 0.328 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.sketch.com/updates/ (Patch, Release Notes, Vendor Advisory)
- jonpalmisc.com/2021/11/22/cve-2021-40531 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-40531?
- CVE-2021-40531 is a critical-severity vulnerability in Apple macOS, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-09-06.
- How severe is CVE-2021-40531?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-40531 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.