Bug 238616 - (CVE-2007-2381) CVE-2007-2381: MochiKit javascript hijacking vulnerability
CVE-2007-2381: MochiKit javascript hijacking vulnerability
Product: Fedora
Classification: Fedora
Component: MochiKit (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Konstantin Ryabitsev
Fedora Extras Quality Assurance
: Security
Depends On:
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Reported: 2007-05-01 16:19 EDT by Ville Skyttä
Modified: 2007-11-30 17:12 EST (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2007-05-01 17:04:16 EDT
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Description Ville Skyttä 2007-05-01 16:19:07 EDT

"The MochiKit framework exchanges data using JavaScript Object Notation (JSON)
without an associated protection scheme, which allows remote attackers to obtain
the data via a web page that retrieves the data through a URL in the SRC
attribute of a SCRIPT element and captures the data using other JavaScript code,
aka "JavaScript Hijacking.""
Comment 1 Konstantin Ryabitsev 2007-05-01 16:39:15 EDT
Contacted upstream.
Comment 2 Konstantin Ryabitsev 2007-05-01 17:04:16 EDT
Upstream sez (http://groups.google.com/group/mochikit/t/e473d15b0e689054):

> Will there be a fix for http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-2381
> in the 1.3.1 branch?

Nope. It's not a real security issue, not with MochiKit anyway. The
recommended "fix" would mean supporting some junk that's not JSON
anymore. I've already caved and put said support on the trunk just so
people would shut up about the issue, but I'm certainly not going to
make a maintenance release to "fix" this non-issue.

Ensuring that your server only sends JSON when properly authenticated,
or otherwise sending only non-exploitable JSON (e.g. JSON with an
object envelope) is the only solution to this problem.

Only a very small subset of JSON, specifically [array, envelope, json]
is susceptible to this data leakage attack. Don't send that stuff on
the server-side, and there is no problem. Most people don't send array
envelope JSON anyhow. Either way, totally irrelevant to the
client-side. It's like saying that we should fix browsers so that they
can't be used to mount a SQL injection attack on a poorly written


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