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CVE-2019-20398

Published: 22 January 2020

A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to parse untrusted input yang files may crash.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
libyang
Launchpad, Ubuntu, Debian
hirsute Ignored
(end of life)
jammy Not vulnerable
(1.0.176-1)
kinetic Not vulnerable
(1.0.176-1)
lunar Does not exist

bionic Does not exist

eoan Ignored
(end of life)
focal Needed

groovy Ignored
(end of life)
impish Not vulnerable
(1.0.176-1)
trusty Does not exist

upstream
Released (1.0.176-1)
xenial Does not exist

mantic Does not exist

Patches:
upstream: https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H