CVE-2019-20394 Information

Description

A double-free is present in libyang before v1.0-r3 in the function yyparse() when a type statement in used in a notification statement. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw which would cause a crash or potentially code execution.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Reference

https://bugzilla.redhat.com/show_bug.cgi?id=1793932 https://github.com/CESNET/libyang/commit/6cc51b1757dfbb7cff92de074ada65e8523289a6 https://github.com/CESNET/libyang/compare/v1.0-r2…v1.0-r3 https://github.com/CESNET/libyang/issues/769

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8