Bug 1793928 (CVE-2019-20397)

Summary:	CVE-2019-20397 libyang: double-free in yyparse() when organization field is not terminated
Product:	[Other] Security Response	Reporter:	Riccardo Schirone <rschiron>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mruprich, tkorbar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libyang 1.0-r1	Doc Type:	If docs needed, set a value
Doc Text:	A double-free flaw occurs in libyang in function yparse() when an organization field is not terminated. Applications that use libyang to process untrusted input YANG files may be vulnerable to this flaw, possibly causing a crash or potential code execution.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 10:10:26 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:	1797539, 1797617, 1910046
Bug Blocks:	1790579

Description Riccardo Schirone 2020-01-22 09:50:28 UTC

A double-free is present in libyang up to version v1.0-r1 in 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.

Upstream issue:
https://github.com/CESNET/libyang/issues/739

Upstream fix:
https://github.com/CESNET/libyang/commit/88bd6c548ba79bce176cd875e9b56e7e0ef4d8d4

Comment 1 Riccardo Schirone 2020-02-03 11:33:56 UTC

Created libyang tracking bugs for this issue:

Affects: fedora-all [bug 1797539]