CVE-2021-46463 : Security Advisory and Response

A vulnerability in njs through 0.7.1, used in NGINX, could allow control flow hijacking due to a Type Confusion in njs_promise_perform_then().

Understanding CVE-2021-46463

njs through version 0.7.1, integrated into NGINX, has a security flaw leading to a control flow hijack, resulting from a Type Confusion issue in the njs_promise_perform_then() function.

What is CVE-2021-46463?

CVE-2021-46463 is a Type Confusion vulnerability found in njs versions prior to 0.7.2 that are utilized within NGINX servers. This flaw enables an attacker to manipulate program control flow.

The Impact of CVE-2021-46463

The vulnerability could allow malicious actors to execute arbitrary code, perform denial of service attacks, or access sensitive information on systems using the affected njs library within NGINX.

Technical Details of CVE-2021-46463

The technical aspects of this vulnerability provide insight into its nature and potential risks.

Vulnerability Description

The flaw in njs_promise_perform_then() function of njs through 0.7.1 allows for control flow hijacking due to a Type Confusion vulnerability.

Affected Systems and Versions

Product: n/a
Vendor: n/a
Versions: n/a

Exploitation Mechanism

The Type Confusion vulnerability in njs_promise_perform_then() can be abused by crafted inputs to mislead the program's logic flow and potentially execute arbitrary code.

Mitigation and Prevention

Addressing CVE-2021-46463 involves immediate actions and long-term security practices to enhance system protection.

Immediate Steps to Take

Update to njs version 0.7.2 or later to mitigate the vulnerability.
Monitor NGINX security advisories for patches and updates.

Long-Term Security Practices

Implement regular security assessments and audits for web servers and applications.
Educate system administrators and developers on secure coding practices.

Patching and Updates

Keep njs library within NGINX servers up to date to ensure the latest security fixes are in place.