CVE-2019-20396 Explained : Impact and Mitigation
Learn about CVE-2019-20396, a segmentation fault vulnerability in libyang yyparse function before v1.0-r1. Find out how to mitigate and prevent exploitation of this issue.
CVE-2019-20396 is a vulnerability found in the yyparse function within libyang prior to version v1.0-r1. This issue leads to a segmentation fault due to an incorrectly structured value within a pattern statement during the parsing of lys_parse_path.
Understanding CVE-2019-20396
What is CVE-2019-20396?
The vulnerability in CVE-2019-20396 is a segmentation fault discovered in the yyparse function of libyang before version v1.0-r1. It arises from an incorrectly structured value within a pattern statement during lys_parse_path parsing.
The Impact of CVE-2019-20396
This vulnerability can be exploited to cause a segmentation fault, potentially leading to denial of service or arbitrary code execution.
Technical Details of CVE-2019-20396
Vulnerability Description
The issue occurs in the yyparse function of libyang before v1.0-r1 due to an incorrectly structured value within a pattern statement during lys_parse_path parsing.
Affected Systems and Versions
- Vendor: n/a
- Product: n/a
- Versions: All versions prior to v1.0-r1 are affected.
Exploitation Mechanism
Attackers can exploit this vulnerability by providing a specially crafted value within a pattern statement during the parsing of lys_parse_path, leading to a segmentation fault.
Mitigation and Prevention
Immediate Steps to Take
- Update libyang to version v1.0-r1 or later to mitigate the vulnerability.
- Monitor vendor security advisories for patches and updates.
Long-Term Security Practices
- Regularly update software and libraries to the latest versions.
- Implement secure coding practices to prevent similar vulnerabilities.
Patching and Updates
Apply patches and updates provided by the vendor to address the CVE-2019-20396 vulnerability.