CVE-2019-20392
Description
An invalid memory access flaw was discovered in libyang in the function resolve_feature_value() when an if-feature statement is used inside a list key node and the feature used is not defined. Applications that use libyang to process untrusted input YANG files may crash.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 6.5 | N/A |
| Attack Vector | Local | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | Required | Required | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Red Hat CVSS v3 Score Explanation
libyang as used in Red Hat Enterprise Linux 8 is only used to parse known and trusted files that are stored in other packages. The only way a user may be affected by this flaw is if he downloads a malicious YANG file and run it through one of the YANG utilities, because the libyang-devel package is not shipped to customers. For these reasons, Attack Vector is Local (AV:N) and User Interaction is Required (UI:R).
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