Closed Bug 793121 (CVE-2012-4195) Opened 11 years ago Closed 10 years ago

nsLocation::CheckURL can use the wrong principal

Categories

(Core :: Security, defect)

x86
Windows XP
defect
Not set
normal

Tracking

()

RESOLVED FIXED
Tracking Status
firefox15 --- unaffected
firefox16 + fixed
firefox17 + fixed
firefox18 + verified
firefox19 + verified
firefox-esr10 --- unaffected

People

(Reporter: moz_bug_r_a4, Assigned: bholley)

References

Details

(4 keywords, Whiteboard: fix in bug 801305)

This is a regression from bug 754202. (fx16,17,18 are affected.)

When a chrome code calls an untrusted function via CrossCompartmentWrapper/WaiveXrayWrapper, GetSubjectPrincipal returns a content principal, but GetPrincipalAndFrame returns the system principal.  nsLocation::CheckURL gets an owner principal by calling GetCxSubjectPrincipalAndFrame, which calls GetPrincipalAndFrame.  

By using this bug, content can perform an XSS attack, and if there is an extension that exposes a chrome window to content, content can run arbitrary code with chrome privileges.
Attached file testcase 1 - XSS (obsolete) —
This tries to get cookies for www.mozilla.org.
Assignee: nobody → bobbyholley+bmo
I decided to do this work over in public over in bug 797204, since the security issue at hand is non-obvious.
We've already gone to build with beta6 so the window on 16 landings has closed. Wontfixing for 16.
Whiteboard: fix in bug 797204
Re-noming for 16 in case we consider this fix for a 16.0.2 "location cleanup" chemspill. In light of bug 801305 though it might be incomplete and/or regression prone; Firefox 17 might be as early as we want to push it.
bug 797204 has the uplift approvals, just need them to land on branches.
(In reply to Lukas Blakk [:lsblakk] from comment #7)
> bug 797204 has the uplift approvals, just need them to land on branches.

Unfortunately we determined that bug 797204 doesn't fix this bug. I've got more targeted patches over in bug 801305.
Whiteboard: fix in bug 797204 → fix in bug 801305
(In reply to Bobby Holley (:bholley) from comment #8)
> (In reply to Lukas Blakk [:lsblakk] from comment #7)
> > bug 797204 has the uplift approvals, just need them to land on branches.
> 
> Unfortunately we determined that bug 797204 doesn't fix this bug. I've got
> more targeted patches over in bug 801305.

Can we mark FF17-19 as fixed now that bug 801305 has landed?
Alias: CVE-2012-4195
Depends on: 801305
The original XSS testcase doesn't work because www.mozilla.org now has an X-Frame-Options header to prevent framing. This is functionally equivalent, at least until blog.mozilla.org does the same thing.
I'm downgrading to sec-high because it's not at the moment a known drive-by exploit. addons are already on dangerous ground using unwrapped DOM objects and should not be injecting content that way.
Keywords: sec-criticalsec-high
bug 801305 hadn't been checked in on branches when comment 9 was asked, but it has now and I've verified the fix in Nightly and Aurora.
Group: core-security
You need to log in before you can comment on or make changes to this bug.