CVE-2020-7724: 
JavaScript vulnerability analysis and mitigation

All versions of the package tiny-conf are vulnerable to Prototype Pollution via the set function. This vulnerability was discovered and disclosed on August 17, 2020, and was assigned CVE-2020-7724. The vulnerability affects all versions of the tiny-conf package, which is a Node.js configuration library designed to work with files, environment variables, and command-line arguments in both browser and server-side environments (Snyk).

The vulnerability exists in the set function of tiny-conf, which allows an attacker to manipulate JavaScript's prototype chain. When exploited, an attacker can inject properties into existing JavaScript language construct prototypes, such as objects. The vulnerability allows modification of magical attributes like proto, constructor, and prototype. A proof of concept demonstrates that calling tinyConf.set('proto.polluted', true) results in a polluted prototype that makes the 'polluted' variable accessible globally (Snyk).

The successful exploitation of this vulnerability can lead to Denial of Service (DoS) by triggering JavaScript exceptions or potentially lead to remote code execution by tampering with the application source code. The vulnerability received a CVSS score of 7.5 (High), indicating its significant security impact. The vulnerability can affect both client-side and server-side applications using the tiny-conf package (Snyk).

The vulnerability has a proof-of-concept available, demonstrating its exploitability. According to the EPSS (Exploit Prediction Scoring System), the probability of exploitation is 1.22% (86th percentile), suggesting a moderate likelihood of exploitation in the wild (Snyk).

There is no fixed version available for tiny-conf. To prevent Prototype Pollution attacks, developers should consider implementing alternative solutions such as: freezing the prototype using Object.freeze(Object.prototype), requiring schema validation of JSON input, avoiding unsafe recursive merge functions, using objects without prototypes (e.g., Object.create(null)), or using Map instead of Object (Snyk).