CVE-2021-46023 : Security Advisory and Response

An Untrusted Pointer Dereference was discovered in function mrb_vm_exec in mruby before 3.1.0-rc. The vulnerability causes a segmentation fault and application crash.

Understanding CVE-2021-46023

What is CVE-2021-46023?

CVE-2021-46023 is an Untrusted Pointer Dereference vulnerability found in the function mrb_vm_exec in mruby versions before 3.1.0-rc. This flaw leads to a segmentation fault, potentially resulting in an application crash.

The Impact of CVE-2021-46023

This vulnerability could be exploited by attackers to crash the application, leading to denial of service or potentially arbitrary code execution.

Technical Details of CVE-2021-46023

Vulnerability Description

The Untrusted Pointer Dereference vulnerability in mruby allows for malicious actors to cause a segmentation fault, resulting in a possible crash of the application.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions Affected: All versions of mruby before 3.1.0-rc

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious input that triggers the untrusted pointer dereference, causing the application to crash.

Mitigation and Prevention

Immediate Steps to Take

Update to mruby version 3.1.0-rc or newer to mitigate this vulnerability.
Implement proper input validation to prevent the exploitation of untrusted pointers.

Long-Term Security Practices

Regularly update software and dependencies to the latest versions to patch known vulnerabilities.
Conduct code reviews and security testing to identify and address potential flaws early.

Patching and Updates

Apply patches and updates provided by mruby to address the Untrusted Pointer Dereference vulnerability.