Bug 1793935 (CVE-2019-20398)

Summary:	CVE-2019-20398 libyang: NULL pointer dereference in function lys_extension_instances_free()
Product:	[Other] Security Response	Reporter:	Riccardo Schirone <rschiron>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	mruprich, tkorbar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libyang 1.0-r3	Doc Type:	If docs needed, set a value
Doc Text:	A NULL pointer dereference flaw occurs in libyang in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to process untrusted input YANG files may crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 10:08:30 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1797552, 1797623, 1910046
Bug Blocks:	1790579

Description Riccardo Schirone 2020-01-22 10:01:43 UTC

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

Upstream fix:
https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08

Upstream issue:
https://github.com/CESNET/libyang/issues/773

Comment 1 Riccardo Schirone 2020-02-03 11:49:10 UTC

Created libyang tracking bugs for this issue:

Affects: fedora-all [bug 1797552]