CVE-2019-19333 : Security Advisory and Response

A stack-based buffer overflow vulnerability has been found in all versions of libyang before 1.0-r5, potentially leading to denial of service attacks or arbitrary code execution.

Understanding CVE-2019-19333

A vulnerability in libyang versions prior to 1.0-r5 that could allow attackers to exploit a stack-based buffer overflow.

What is CVE-2019-19333?

A stack-based buffer overflow vulnerability in libyang versions before 1.0-r5
Occurs when parsing YANG files with a leaf of type "bits"
Attackers could execute arbitrary code or launch denial of service attacks

The Impact of CVE-2019-19333

CVSS Base Score: 8.1 (High)
Attack Vector: Network
Confidentiality, Integrity, and Availability Impact: High
No privileges required for exploitation

Technical Details of CVE-2019-19333

A detailed look at the technical aspects of the vulnerability.

Vulnerability Description

Stack-based buffer overflow in libyang parsing YANG files with a specific leaf type
Potential for denial of service attacks or arbitrary code execution

Affected Systems and Versions

Product: libyang
Vendor: Red Hat
Versions affected: All versions before 1.0-r5

Exploitation Mechanism

Exploitation through parsing of YANG files containing a leaf of type "bits"
Applications using libyang to parse untrusted YANG files are vulnerable

Mitigation and Prevention

Steps to mitigate the CVE-2019-19333 vulnerability.

Immediate Steps to Take

Update libyang to version 1.0-r5 or later
Avoid parsing untrusted YANG files with applications using libyang

Long-Term Security Practices

Regularly update software and libraries to the latest versions
Implement input validation and secure coding practices

Patching and Updates

Apply patches provided by Red Hat and other relevant vendors