Bug 1687706 (CVE-2019-9706)

Summary:	CVE-2019-9706 vixie-cron: use-after-free resulting in dos
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mmaslano, mplch, tmraz
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:50:28 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:	1711927
Bug Blocks:	1687709

Description Dhananjay Arunesh 2019-03-12 07:56:59 UTC

Vixie Cron before the 3.0pl1-133 Debian package allows local users to cause a denial of service (use-after-free and daemon crash) because of a force_rescan_user error.

Reference:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809167

Upstream commit:
https://salsa.debian.org/debian/cron/commit/40791b93

Comment 1 Tomas Mraz 2019-03-14 10:26:05 UTC

I do not think there is such code in cronie or the vixie-cron shipped in RHEL or Fedora.

Comment 2 Riccardo Schirone 2019-05-20 12:10:10 UTC

This seems to be caused by a downstream patch applied to Debian/Ubuntu and, as also said in comment 1, Fedora/RHEL are not affected by this flaw as they simply don't have the vulnerable code.

Comment 3 Riccardo Schirone 2019-05-20 12:21:36 UTC

Created cronie tracking bugs for this issue:

Affects: fedora-all [bug 1711927]

Comment 4 Riccardo Schirone 2019-05-20 12:25:10 UTC

Statement:

This issue did not affect the versions of vixie-cron as shipped with Red Hat Enterprise Linux 5 as they did not include the vulnerable code.
This issue did not affect the versions of cronie as shipped with Red Hat Enterprise Linux 6, 7, and 8 as they did not include the vulnerable code.