CVE-2024-33263: 
NixOS vulnerability analysis and mitigation

QuickJS version commit 3b45d15 contains an Assertion Failure vulnerability in the JS_FreeRuntime function located in quickjs.c. The vulnerability was discovered and disclosed on May 14, 2024, affecting the core runtime functionality of QuickJS (GitHub Issue).

The vulnerability manifests as an assertion failure in the JS_FreeRuntime(JSRuntime *) function at line 1997 of quickjs.c. The assertion list_empty(&rt->gc_obj_list) fails during runtime cleanup, indicating a potential memory management issue. The vulnerability can be triggered through specific JavaScript code patterns involving nested Proxy objects and function calls (GitHub Issue).

When exploited, the vulnerability causes the QuickJS runtime to abort execution with a DEADLYSIGNAL error, leading to a crash of the application. This results in a denial of service condition. The AddressSanitizer report indicates the crash occurs due to an ABRT signal, affecting the core runtime cleanup process (GitHub Issue).

The vulnerability can be triggered by executing specific JavaScript code that involves nested Proxy objects and custom function definitions. A proof-of-concept exploit has been documented that demonstrates the issue using a combination of Proxy objects and function calls (GitHub Issue).

As of the initial report, no official patch or mitigation has been released. The vulnerability is currently under analysis and awaiting further investigation (NVD Database).