Jirafeau
Monthly
Jirafeau's MIME type validation can be bypassed by sending crafted HTTP requests with invalid MIME types, allowing attackers to trigger browser-based MIME sniffing that may execute malicious JavaScript embedded in SVG or HTML files. An unauthenticated remote attacker can exploit this through a simple network request requiring user interaction to view a malicious preview. A patch is available and the vulnerability affects Jirafeau and related products.
Jirafeau normally prevents browser preview for text files due to the possibility that for example SVG and HTML documents could be exploited for cross site scripting. This was done by storing the MIME type of a file and allowing only browser preview for MIME types beginning with image (except for image/svg+xml, see CVE-2022-30110 and CVE-2024-12326), video and audio. However, it was possible to bypass this check by sending a manipulated MIME type containing a comma and an other MIME type like text/html (for example image/png,text/html). Browsers see multiple MIME types and text/html would takes precedence, allowing a possible attacker to do a cross-site scripting attack. The check for MIME types was enhanced to prevent a browser preview when the stored MIME type contains a comma.
Jirafeau's MIME type validation can be bypassed by sending crafted HTTP requests with invalid MIME types, allowing attackers to trigger browser-based MIME sniffing that may execute malicious JavaScript embedded in SVG or HTML files. An unauthenticated remote attacker can exploit this through a simple network request requiring user interaction to view a malicious preview. A patch is available and the vulnerability affects Jirafeau and related products.
Jirafeau normally prevents browser preview for text files due to the possibility that for example SVG and HTML documents could be exploited for cross site scripting. This was done by storing the MIME type of a file and allowing only browser preview for MIME types beginning with image (except for image/svg+xml, see CVE-2022-30110 and CVE-2024-12326), video and audio. However, it was possible to bypass this check by sending a manipulated MIME type containing a comma and an other MIME type like text/html (for example image/png,text/html). Browsers see multiple MIME types and text/html would takes precedence, allowing a possible attacker to do a cross-site scripting attack. The check for MIME types was enhanced to prevent a browser preview when the stored MIME type contains a comma.