| Age | Commit message (Collapse) | Author |
|---|
|
|
|
On Windows, if an application is registered as an URL handler like this:
HKEY_CLASSES_ROOT
https
URL Protocol = ""
[...]
shell
open
command
(Default) = ".../qutebrowser.exe" "%1"
one would think that Windows takes care of making sure URLs can't inject
arguments by containing a quote. However, this is not the case, as
stated by the Microsoft docs:
https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/platform-apis/aa767914(v=vs.85)
Security Warning: Applications that handle URI schemes must consider how to
respond to malicious data. Because handler applications can receive data
from untrusted sources, the URI and other parameter values passed to the
application may contain malicious data that attempts to exploit the handling
application.
and
As noted above, the string that is passed to a pluggable protocol handler
might be broken across multiple parameters. Malicious parties could use
additional quote or backslash characters to pass additional command line
parameters. For this reason, pluggable protocol handlers should assume that
any parameters on the command line could come from malicious parties, and
carefully validate them. Applications that could initiate dangerous actions
based on external data must first confirm those actions with the user. In
addition, handling applications should be tested with URIs that are overly
long or contain unexpected (or undesirable) character sequences.
Indeed it's trivial to pass a command to qutebrowser this way - given how
trivial the exploit is to recreate given the information above, here's a PoC:
https:x" ":spawn calc
(or qutebrowserurl: instead of https: if qutebrowser isn't registered as a
default browser)
Some applications do escape the quote characters before calling
qutebrowser - but others, like Outlook Desktop or .url files, do not.
As a fix, we add an --untrusted-args flag and some early validation of the raw
sys.argv, before parsing any arguments or e.g. creating a QApplication (which
might already allow injecting Qt flags there).
We assume that there's no way for an attacker to inject flags *before* the %1
placeholder in the registry, and add --untrusted-args as the last argument of
the registry entry. This way, it'd still be possible for users to customize
their invocation flags without having to remove --untrusted-args.
After --untrusted-args, however, we have some rather strict checks:
- There should be zero or one arguments, but not two (or more)
- Any argument may not start with - (flag) or : (qutebrowser command)
We also add the --untrusted-args flag to the Linux .desktop file, though it
should not be needed there, as the specification there is sane:
https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#exec-variables
Implementations must take care not to expand field codes into multiple
arguments unless explicitly instructed by this specification. This means
that name fields, filenames and other replacements that can contain spaces
must be passed as a single argument to the executable program after
expansion.
There is no comparable mechanism on macOS, which opens the application without
arguments and then sends an "open" event to it:
https://doc.qt.io/qt-5/qfileopenevent.html
This issue was introduced in qutebrowser v1.7.0 which started registering it as
URL handler: baee2888907b260881d5831c68500941937261a0 / #4086
This is by no means an issue isolated to qutebrowser. Many other projects have
had similar trouble with Windows' rather unexpected behavior:
Electron / Exodus Bitcoin wallet:
- http://web.archive.org/web/20190702112128/https://medium.com/0xcc/electrons-bug-shellexecute-to-blame-cacb433d0d62
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000006
- https://medium.com/hackernoon/exploiting-electron-rce-in-exodus-wallet-d9e6db13c374
IE/Firefox:
- https://bugzilla.mozilla.org/show_bug.cgi?id=384384
- https://bugzilla.mozilla.org/show_bug.cgi?id=1572838
Others:
- http://web.archive.org/web/20210930203632/https://www.vdoo.com/blog/exploiting-custom-protocol-handlers-in-windows
- https://parsiya.net/blog/2021-03-17-attack-surface-analysis-part-2-custom-protocol-handlers/
- etc. etc.
See CVE-2021-41146 / GHSA-vw27-fwjf-5qxm:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41146
https://github.com/qutebrowser/qutebrowser/security/advisories/GHSA-vw27-fwjf-5qxm
Thanks to Ping Fan (Zetta) Ke of Valkyrie-X Security Research Group
(VXRL/@vxresearch) for finding and responsibly disclosing this issue.
(cherry picked from commit 8f46ba3f6dc7b18375f7aa63c48a1fe461190430)
# Conflicts:
# qutebrowser/qutebrowser.py
# tests/unit/test_qutebrowser.py
|
|
This is a continuation of the previous commit for #5403. The tests are split up
from the commit itself so that the fix can be backported with less conflicts.
See #5403
(cherry picked from commit 45a2be3f9f32f900c0b567998433d43055f722e2)
|
|
Without this change, we only set a flag when a certificate error occurred.
However, when the same certificate error then happens a second time (e.g.
because of a reload or opening the same URL again), we then colored the URL as
success_https (i.e. green) again.
See #5403
(cherry picked from commit 021ab572a319ca3db5907a33a59774f502b3b975)
|
|
|
|
|
|
|
|
The blog uses Cloudflare DDoS protection nowadays, and since we removed most
UAs from the completion, doing updates by hand is feasible.
|
|
|
|
|
|
|
|
|
|
|
|
3.0.0 needs Python 3.6 or higher
|
|
Looks like PyQt 5.11 uses PyQt5-sip, so no need to have sip there.
However, requires.io tries to upgrade it to PyQt5-sip 12.7.0 despite the wheel
depending on < 4.20.
|
|
|
|
|
|
Apparently, hunter 3.1.0 was accidentally tagged/pushed which causes
requires.io to try to update to it, despite it not being available.
|
|
|
|
Old PyQt versions need sip < 5 which doesn't work with Python 3.8.
pylint doesn't install typed_ast with Python 3.8 (as the builtin ast module
suffices).
|
|
|
|
|
|
See #5013
|
|
|
|
|
|
[ci skip]
|
|
Closes #5115
|
|
No remaining issues on Windows, IIRC.
|
|
This uses QtFont.setFamilies, similar to what QCssParser does in the commit
where it was introduced: https://codereview.qt-project.org/c/qt/qtbase/+/240070
It also fixes a "font family too long" warning on Windows - see #5013
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Use (slightly) clearer wording
|
|
...whoops :-/
|
|
|
|
Fixes #4517
|
|
|
|
Looks like at least for some users, /signin/... needs a Firefox UA to make the
workaround work. Given that accounts.google.com only is used for things related
to the sign-in form (settings live at myaccount.google.com), let's take a
slightly bigger hammer and use a Firefox UA for the entire subdomain.
See #5147, #4810
|
|
This moves the setTabToolTip call to a better place - the previous
update_tab_title call had various problems, such as replacing & by && (to avoid
Qt interpreting it as a QShortcut accelerator) and exiting early if
{current_title} isn't in the title format. None of those matter for the tab
tooltip text, though.
|
|
|
|
|
|
|
