JavaScript JIT Compiler Inlining Vulnerability in Firefox ESR and Firefox

CVE-2018-12387 · MEDIUM Severity

AV:N/AC:L/AU:N/C:P/I:N/A:P

A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content process. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.

Learn more about our Web Application Penetration Testing UK.