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CVE-2021-41146

Published: 21 October 2021

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.

Priority

Medium

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
qutebrowser
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code-not-compiled)
focal Not vulnerable
(code-not-compiled)
hirsute Not vulnerable
(code-not-compiled)
impish Not vulnerable
(code-not-compiled)
jammy Not vulnerable
(code-not-compiled)
trusty Ignored
(end of standard support)
upstream Not vulnerable
(debian: Only affects Windows)
xenial Ignored
(end of standard support)

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H