CVE-2024-4367

Faltaba una verificación de tipo al manejar fuentes en PDF.js, lo que permitiría la ejecución arbitraria de JavaScript en el contexto de PDF.js. Esta vulnerabilidad afecta a Firefox < 126, Firefox ESR < 115.11 y Thunderbird < 115.11.

A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes this flaw as follows: A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context.

PDF.js is vulnerable to Arbitrary JavaScript Execution in versions prior to 4.2.67. This is due to a missing type check when handling fonts. This makes it possible for authenticated attackers, with contributor-level or above permissions, to execute arbitrary JavaScript if they can successfully trick a user into opening a crafted PDF file.

USN-6779-1 fixed vulnerabilities in Firefox. The update introduced several minor regressions. This update fixes the problem. Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information across domains, or execute arbitrary code. Jan-Ivar Bruaroey discovered that Firefox did not properly manage memory when audio input connected with multiple consumers. An attacker could potentially exploit this issue to cause a denial of service, or execute arbitrary code. Thomas Rinsma discovered that Firefox did not properly handle type check when handling fonts in PDF.js. An attacker could potentially exploit this issue to execute arbitrary javascript code in PDF.js. Irvan Kurniawan discovered that Firefox did not properly handle certain font styles when saving a page to PDF. An attacker could potentially exploit this issue to cause a denial of service.