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CVE-2019-20397

Published: 22 January 2020

A double-free is present in libyang before v1.0-r1 in the function yyparse() when an organization field is not terminated. 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.

Priority

Medium

Cvss 3 Severity Score

8.8

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/88bd6c548ba79bce176cd875e9b56e7e0ef4d8d4

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H