CVE-2019-7701 Explained : Impact and Mitigation

Binaryen version 1.38.22 has a heap-based buffer over-read vulnerability in wasm-s-parser.cpp. An attacker can exploit this to trigger a denial-of-service condition.

Understanding CVE-2019-7701

Binaryen version 1.38.22 has a vulnerability in the wasm::SExpressionParser::skipWhitespace() function.

What is CVE-2019-7701?

The vulnerability in Binaryen version 1.38.22 allows an attacker to cause a denial-of-service condition by providing a specially crafted wasm input.

The Impact of CVE-2019-7701

Exploiting this vulnerability can lead to a segmentation fault, resulting in a denial-of-service condition.

Technical Details of CVE-2019-7701

Binaryen version 1.38.22 is affected by a heap-based buffer over-read vulnerability.

Vulnerability Description

The vulnerability exists in the wasm::SExpressionParser::skipWhitespace() function in wasm-s-parser.cpp.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Version: Not applicable

Exploitation Mechanism

An attacker can exploit this vulnerability by supplying a specially crafted wasm input, triggering a segmentation fault.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Update to a patched version of Binaryen to mitigate the vulnerability.
Monitor for any unusual wasm inputs that could potentially trigger the vulnerability.

Long-Term Security Practices

Regularly update software and dependencies to the latest secure versions.
Implement input validation mechanisms to prevent malicious inputs.

Patching and Updates

Ensure that Binaryen is regularly updated to the latest version to patch known vulnerabilities.