Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/17686#discussion_r112225087 --- Diff: core/src/main/scala/org/apache/spark/ui/UIUtils.scala --- @@ -527,4 +528,27 @@ private[spark] object UIUtils extends Logging { origHref } } + + /** + * Remove suspicious characters of user input to prevent Cross-Site scripting (XSS) attacks + * + * For more information about XSS testing: + * https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet and + * https://www.owasp.org/index.php/Testing_for_Reflected_Cross_site_scripting_(OTG-INPVAL-001) + */ + def stripXSS(url: String): String = { + var strippedXSSUrl = url + if (strippedXSSUrl != null) { + // Avoid null characters or single quote + strippedXSSUrl = strippedXSSUrl.replaceAll("(\r\n|\n|\r|%0D%0A|%0A|%0D|'|%27)", "") + strippedXSSUrl = StringEscapeUtils.escapeHtml4(strippedXSSUrl) + } + strippedXSSUrl + } + + def stripXSSMap(url: Array[String]): Array[String] = { --- End diff -- Not sure what this method is trying to do but it just returns its argument. Do you just mean `url.map(stripXSS)`? why Map, why url as names?
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