{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cloudfront/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["aws","cloudfront","injection","security"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA vulnerability exists in the CloudFront signing utilities within the AWS SDK for PHP, specifically impacting versions 3.11.7 through 3.371.3. These utilities are responsible for generating Amazon CloudFront signed URLs and signed cookies, which control access to content. The vulnerability arises from the improper handling of special characters, such as double quotes and backslashes, within input values used to construct policy documents. If an application passes unsanitized input containing these characters to the signing utilities, the resulting policy document may deviate from the application\u0026rsquo;s intended access restrictions. An enhancement was made to the AWS SDK for PHP version 3.371.4 to address this issue. This vulnerability impacts applications that do not properly sanitize inputs passed to the CloudFront signing utilities.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker identifies an application using a vulnerable version of the AWS SDK for PHP (3.11.7 - 3.371.3) that utilizes CloudFront signed URLs or cookies.\u003c/li\u003e\n\u003cli\u003eThe attacker locates an input field within the application that is used to generate CloudFront policy documents.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious input string containing special characters (e.g., double quotes, backslashes) designed to manipulate the resulting policy document.\u003c/li\u003e\n\u003cli\u003eThe application passes the attacker-controlled input to the CloudFront signing utilities without proper sanitization or validation.\u003c/li\u003e\n\u003cli\u003eThe CloudFront signing utilities generate a signed URL or cookie with a flawed policy document due to the injected special characters.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the crafted signed URL or cookie to bypass intended access restrictions and potentially gain unauthorized access to protected content.\u003c/li\u003e\n\u003cli\u003eThe attacker accesses restricted resources on CloudFront that should have been protected by the intended policy.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability could lead to unauthorized access to content protected by Amazon CloudFront. If an attacker can manipulate the policy document, they might bypass intended access restrictions, potentially exposing sensitive data or allowing unauthorized actions. The number of affected applications is unknown, but any application using the vulnerable versions of the AWS SDK for PHP and failing to sanitize input is at risk.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade to AWS SDK for PHP version 3.371.4 or later to incorporate the fix that addresses special character handling (reference: Patches section).\u003c/li\u003e\n\u003cli\u003eImplement robust input validation in application code to sanitize or escape special characters before passing values to CloudFront signing utilities (reference: Workarounds section).\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for unusual patterns of URL requests containing special characters that might indicate exploitation attempts (reference: webserver log source).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-03-27T19:54:58Z","date_published":"2026-03-27T19:54:58Z","id":"/briefs/2024-01-aws-sdk-cloudfront-injection/","summary":"A vulnerability exists in the AWS SDK for PHP CloudFront signing utilities where special characters in input values are not properly handled when creating policy documents, potentially leading to unintended access restrictions, affecting versions 3.11.7 through 3.371.3.","title":"AWS SDK for PHP CloudFront Policy Document Injection via Special Characters","url":"https://feed.craftedsignal.io/briefs/2024-01-aws-sdk-cloudfront-injection/"}],"language":"en","title":"CraftedSignal Threat Feed — Cloudfront","version":"https://jsonfeed.org/version/1.1"}