Resource exhaustion in Onionshare
CVE-2022-21689
OnionShare is an open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network. In affected versions the receive mode limits concurrent uploads to 100 per second and blocks other uploads in the same second, which can be triggered by a simple script. An adversary with access to the receive mode can block file upload for others. There is no way to block this attack in public mode due to the anonymity properties of the tor network.
Vulnerability class: DoS (Denial of Service)
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: 0.013 (70.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.013 · 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-jh82-c5jw-pxpc (Third Party Advisory)
Frequently asked questions
- What is CVE-2022-21689?
- CVE-2022-21689 is a high-severity vulnerability in Onionshare, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2022-01-18.
- How severe is CVE-2022-21689?
- High severity. CVSS v3 base score is 7.5 out of 10.