CVE-2020-23921 Explained : Impact and Mitigation

An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.

Understanding CVE-2020-23921

This CVE describes a vulnerability in the fast_ber library that can lead to a heap-based buffer over-read.

What is CVE-2020-23921?

The vulnerability in fast_ber through v0.4 allows an attacker to trigger a heap-based buffer over-read by exploiting the yy::yylex() function in asn_compiler.hpp.

The Impact of CVE-2020-23921

The vulnerability could potentially be exploited by an attacker to read sensitive information from the affected system's memory, leading to a loss of confidentiality and potentially enabling further attacks.

Technical Details of CVE-2020-23921

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability in fast_ber through v0.4 is due to a heap-based buffer over-read in the yy::yylex() function in asn_compiler.hpp.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: All versions up to v0.4

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious input that triggers the heap-based buffer over-read in the yy::yylex() function.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2020-23921.

Immediate Steps to Take

Update fast_ber to a patched version that addresses the heap-based buffer over-read vulnerability.
Monitor for any unusual activities on the system that could indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update software libraries and dependencies to ensure known vulnerabilities are patched.
Conduct security assessments and code reviews to identify and address potential vulnerabilities in the codebase.

Patching and Updates

Stay informed about security updates and patches released by the fast_ber project.
Apply patches promptly to protect systems from known vulnerabilities.