Aaron Grattafiori

A malicious website may be able to process restricted web content outside the sandbox. A sandbox is a security mechanism for separating running programs from one another to prevent a compromised application from accessing sensitive data or system resources.

A malicious server can exploit TLS OCSP stapling by delivering a crafted response through the `status request` extension. This triggers a double-free in the client's certificate verification path when the stapled response is checked. A double-free occurs when a program attempts to free the same memory location twice, which can corrupt heap memory. This may lead to a Denial of Service, attacker-controlled code execution, or other undefined behavior. OCSP stapling is not enabled by default.

The issue allows remote attackers to execute arbitrary code via format string specifiers in an invalid URI on the command line. This can be demonstrated by the use of yelp within man or ghelp URI handlers in various programs, including Firefox and Evolution. The vulnerability may lead to a violation of confidentiality, integrity, and availability of protected information and can be exploited remotely.