Arbitrary Code Execution Affecting angularjs.core package, versions [,1.4.0)
Snyk CVSS
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Test your applications- Snyk ID SNYK-DOTNET-ANGULARJSCORE-1579466
- published 23 Jan 2017
- disclosed 9 Mar 2015
- credit Rodric Haddad
How to fix?
Upgrade AngularJS.Core
to version 1.4.0 or higher.
Overview
AngularJS.Core is an AngularJS.* package for other Angular modules within .NET.
Affected versions of this package are vulnerable to Arbitrary Code Execution via unsafe svg animation tags.
Details
Exploit Example:
<svg>
<a xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="?">
<circle r="400"></circle>
<animate attributeName="xlink:href" begin="0" from="javascript:alert(1)" to="&" />
</a>
</svg>
Here the anchor's href is animated, starting from a value that's a javascript URI. This allows execution of arbitrary javascript in the process. Preventing only the animation of links is tricky, as SVG is weird and namespaces aren't predictable. The fix is to have the sanitizer filter out svg animation tags instead.