SWFUpload XSS vulnerability

Justin Obara obara.justin at gmail.com
Thu May 1 13:51:04 UTC 2014

While I'd like to maintain backwards compatibility in a point release, I feel that the security of our users takes precedence. We should make sure to add a note to the release notes for Infusion 1.5 about why Flash support for the uploader was removed.



On May 1, 2014, at 9:46 AM, Clark, Colin <cclark at ocadu.ca> wrote:

> Hi everyone,
> I have discovered that SWFUpload, the Flash-based backend that we use for the Uploader on legacy (i.e. old Internet Explorer) browsers, has an unpatched cross-site scripting vulnerability. I’ve filed a JIRA ticket about this issue here:
> http://issues.fluidproject.org/browse/FLUID-5354
> SWFUpload has, sadly, always represented some of the worst and most brittle code we’ve encountered. Replacing it is costly, and time are changing. Our plan for post-1.5 has been to drop support for legacy (i.e. non latest version) browsers. This would have involved removing Flash support in the Uploader anyway.
> Given the severity of this issue, I am proposing that we go ahead and drop Flash support from the Uploader in the Infusion 1.5 release. On legacy browsers such as IE 8 and 9, the simple file uploader will be delivered instead. Modern browsers will get the feature-rich HTML5 version.
> Colin
> ---
> Colin Clark
> Lead Software Architect,
> Inclusive Design Research Centre, OCAD University
> http://inclusivedesign.ca
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