CVE-2024-7521

Incomplete WebAssembly exception handing could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.

The Mozilla Foundation Security Advisory describes this flaw as: Incomplete WebAssembly exception handing could have led to a use-after-free.

USN-6966-1 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. It was discovered that Firefox did not properly manage certain memory operations when processing graphics shared memory. An attacker could potentially exploit this issue to escape the sandbox. Nan Wang discovered that Firefox did not properly handle type check in WebAssembly. An attacker could potentially exploit this issue to execute arbitrary code. Irvan Kurniawan discovered that Firefox did not properly check an attribute value in the editor component, leading to an out-of-bounds read vulnerability. An attacker could possibly use this issue to cause a denial of service or expose sensitive information. Rob Wu discovered that Firefox did not properly check permissions when creating a StreamFilter. An attacker could possibly use this issue to modify response body of requests on any site using a web extension.