CVE-2021-46549 : Exploit Details and Defense Strategies

Cesanta MJS v2.20.0 was discovered to contain a SEGV vulnerability via parse_cval_type at src/mjs_ffi.c. This vulnerability can lead to a Denial of Service (DoS).

Understanding CVE-2021-46549

Cesanta MJS v2.20.0 SEGV vulnerability

What is CVE-2021-46549?

CVE-2021-46549 refers to a SEGV vulnerability present in Cesanta MJS v2.20.0, specifically through parse_cval_type at src/mjs_ffi.c. This vulnerability poses a risk of Denial of Service (DoS) attacks.

The Impact of CVE-2021-46549

The vulnerability in Cesanta MJS v2.20.0 can be exploited to cause a Denial of Service (DoS) attack, disrupting the normal functionality of the affected system.

Technical Details of CVE-2021-46549

Details of the vulnerability

Vulnerability Description

The vulnerability in Cesanta MJS v2.20.0 is caused by improper handling of cval types in the parse_cval_type function at src/mjs_ffi.c, leading to a SEGV issue that can be exploited by an attacker.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Version: n/a

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious input to trigger the SEGV issue in Cesanta MJS v2.20.0, potentially resulting in a DoS condition.

Mitigation and Prevention

Protecting against CVE-2021-46549

Immediate Steps to Take

Update Cesanta MJS to the latest patched version to mitigate the vulnerability.
Implement proper input validation to prevent malicious inputs.

Long-Term Security Practices

Regularly monitor CVE disclosures and vendor patches for security updates.
Consider security assessments and code reviews to identify vulnerabilities proactively.

Patching and Updates

Ensure timely application of security patches released by Cesanta for MJS to address known vulnerabilities.