Bug 1793934 (CVE-2019-20391)

Summary:	CVE-2019-20391 libyang: invalid memory access in resolve_feature_value() when a if-feature is used inside a bit
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:	An invalid memory access flaw occurs in libyang in the function resolve_feature_value() when an if-feature statement is used inside a bit. Applications that use libyang to process untrusted input YANG files may crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 10:10:40 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:	1797551, 1797621, 1910046
Bug Blocks:	1790579

Description Riccardo Schirone 2020-01-22 09:59:33 UTC

An invalid memory access flaw is present in libyang up to version v1.0-r3 in function resolve_feature_value() when a if-feature statement is used inside a bit. Applications that use libyang to parse untrusted input yang files may crash.

Upstream fix:
https://github.com/CESNET/libyang/commit/bdb596ddc07596fa212f231135b87d0b9178f6f8

Upstream issue:
https://github.com/CESNET/libyang/issues/772

Comment 1 Riccardo Schirone 2020-02-03 11:48:25 UTC

Created libyang tracking bugs for this issue:

Affects: fedora-all [bug 1797551]