Out-of-bounds Read in Onionshare
CVE-2022-21688
OnionShare is an open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network. Affected versions of the desktop application were found to be vulnerable to denial of service via an undisclosed vulnerability in the QT image parsing. Roughly 20 bytes lead to 2GB memory consumption and this can be triggered multiple times. To be abused, this vulnerability requires rendering in the history tab, so some user interaction is required. An adversary with knowledge of the Onion service address in public mode or with authentication in private mode can perform a Denial of Service attack, which quickly results in out-of-memory for the server. This requires the desktop application with rendered history, therefore the impact is only elevated. This issue has been patched in version 2.5.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (54.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Onionshare — versions < 2.5
Weakness classification (CWE)
References
- github.com/onionshare/onionshare/releases/tag/v2.5 (Third Party Advisory, Release Notes)
- github.com/onionshare/onionshare/security/advisories/GHSA-x7wr-283h-5h2v (Third Party Advisory)
Frequently asked questions
- What is CVE-2022-21688?
- CVE-2022-21688 is a high-severity vulnerability in Onionshare, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2022-01-18.
- How severe is CVE-2022-21688?
- High severity. CVSS v3 base score is 7.5 out of 10.