CVE-2019-20392 : Vulnerability Insights and Analysis
Learn about CVE-2019-20392, a flaw in libyang software versions prior to v1.0-r1 that can lead to a crash when processing untrusted input yang files. Find out how to mitigate this vulnerability.
CVE-2019-20392 is a vulnerability in the libyang software that can lead to an invalid memory access, potentially resulting in a crash when processing untrusted input yang files.
Understanding CVE-2019-20392
This CVE identifies a specific flaw in libyang software versions prior to v1.0-r1 that can trigger an invalid memory access.
What is CVE-2019-20392?
The vulnerability arises in the resolve_feature_value() function of libyang when an if-feature statement is used within a list key node without a defined feature, potentially causing a crash if untrusted input yang files are parsed.
The Impact of CVE-2019-20392
The exploitation of this vulnerability can lead to a denial of service (DoS) condition due to a crash in applications utilizing libyang to process yang files.
Technical Details of CVE-2019-20392
This section delves into the technical aspects of the CVE.
Vulnerability Description
The flaw in libyang software versions prior to v1.0-r1 allows for an invalid memory access, specifically triggered by the improper handling of if-feature statements within list key nodes.
Affected Systems and Versions
- Vendor: n/a
- Product: n/a
- Affected Version: Prior to v1.0-r1
Exploitation Mechanism
The vulnerability can be exploited by crafting malicious yang files with if-feature statements lacking defined features, leading to a crash when processed by applications using libyang.
Mitigation and Prevention
To address CVE-2019-20392, follow these mitigation strategies:
Immediate Steps to Take
- Update libyang software to version v1.0-r1 or later to mitigate the vulnerability.
- Avoid parsing untrusted yang files until the software is patched.
Long-Term Security Practices
- Regularly update software components to the latest versions to address known vulnerabilities.
- Implement input validation mechanisms to prevent the processing of potentially malicious files.
Patching and Updates
- Apply the security update provided by libyang to fix the vulnerability and enhance system security.