RCE in Qutebrowser
CVE-2021-41146
qutebrowser is an open source keyboard-focused browser with a minimal GUI. Starting with qutebrowser v1.7.0, the Windows installer for qutebrowser registers a `qutebrowserurl:` URL handler. With certain applications, opening a specially crafted `qutebrowserurl:...` URL can lead to execution of qutebrowser commands, which in turn allows arbitrary code execution via commands such as `:spawn` or `:debug-pyeval`. Only Windows installs where qutebrowser is registered as URL handler are affected. The issue has been fixed in qutebrowser v2.4.0. The fix also adds additional hardening for potential similar issues on Linux (by adding the new --untrusted-args flag to the .desktop file), though no such vulnerabilities are known.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.015 (73.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Qutebrowser — versions >= 1.7.0, < 2.4.0
Weakness classification (CWE)
References
- github.com/qutebrowser/qutebrowser/security/advisories/GHSA-vw27-fwjf-5qxm (Third Party Advisory)
- github.com/qutebrowser/qutebrowser/commit/8f46ba3f6dc7b18375f7aa63c48a1fe461190… (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-41146?
- CVE-2021-41146 is a high-severity vulnerability in Qutebrowser, classified under Command Injection. CVSS score: 8.8/10. Published 2021-10-21.
- How severe is CVE-2021-41146?
- High severity. CVSS v3 base score is 8.8 out of 10.