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Javascript execution from template #1267

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cryptoad opened this issue Nov 3, 2016 · 3 comments
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Javascript execution from template #1267

cryptoad opened this issue Nov 3, 2016 · 3 comments
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@cryptoad
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cryptoad commented Nov 3, 2016 •
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It is possible to execute Javascript from a template without registering any helper/partial/whatever or having any function in the context. I am not sure if you guys care about this, but it probably is not ideal in the event of a template injection. Anyway, it makes the logicless aspect less logicless.

Here is a sample that would execute whatever is in the initial string (eg: alert(1)) without anything extra registered:

{{#with 'alert(1)|'}}
{{#with (split '|' 1)}}
{{#> p constructor.constructor}}
{{> (apply 0 ../this)}}
{{/p}}
{{/with}}
{{/with}}

I'd venture and say that it could be fixed by making sure that only "own" properties of the helpers/etc dictionaries can be accessed instead of their prototypes' ones as well.
@lawnsea
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lawnsea commented Nov 23, 2016

This seems like a bug.

@lawnsea lawnsea added the bug label Nov 23, 2016
@nknapp nknapp mentioned this issue Sep 11, 2017
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nknapp added a commit that referenced this issue Feb 7, 2019
@nknapp
fix: disallow access to the constructor in templates to prevent RCE
42841c4 
This commit fixes a Remote Code Execution (RCE) reported by
npm-security. Access to non-enumerable "constructor"-properties
is now prohibited by the compiled template-code, because this
the first step on the way to creating and execution arbitrary
JavaScript code.
The vulnerability affects systems where an attacker is allowed to
inject templates into the Handlebars setup.
Further details of the attack may be disclosed by npm-security.

Closes #1267
Closes #1495
nknapp added a commit that referenced this issue Feb 7, 2019
@nknapp
fix: disallow access to the constructor in templates to prevent RCE
7372d4e 
This commit fixes a Remote Code Execution (RCE) reported by
npm-security. Access to non-enumerable "constructor"-properties
is now prohibited by the compiled template-code, because this
the first step on the way to creating and execution arbitrary
JavaScript code.
The vulnerability affects systems where an attacker is allowed to
inject templates into the Handlebars setup.
Further details of the attack may be disclosed by npm-security.

Closes #1267
Closes #1495
@nknapp nknapp closed this as completed in edc6220 Feb 17, 2019
@hady2
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hady2 commented Feb 18, 2019

Merged #1501 into 4.x.

@nknapp
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nknapp commented Feb 19, 2019

@hady2 I don't understand your comment. Could you explain?

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@lawnsea @nknapp @cryptoad @hady2