Bug 1473243 (CVE-2017-7540)

Summary:	CVE-2017-7540 rubygem-safemode: Bypassing the whitelist of safe commands via block_pass
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	apevec, bkearney, cbillett, chrisw, cvsbot-xmlrpc, jjoyce, jmatthew, jschluet, lhh, lpeer, markmc, mburns, mmccune, ohadlevy, rbryant, sclewis, sisharma, srevivo, tdecacqu, tsanders
Target Milestone:	---	Keywords:	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:	2021-10-21 11:55:00 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:	1473795
Bug Blocks:	1473244

Description Adam Mariš 2017-07-20 09:56:14 UTC

A vulnerability was found in rubygem-safemode, used e.g. in Foreman. It has been found that user rendering a template (e.g. with edit_templates permission) can bypass safe mode limitations through a special ruby syntax. This can lead e.g. to deletion of objects for which the user does not have delete permissions or possibly to privilege escalation.

Upstream bug:

https://github.com/svenfuchs/safemode/pull/23

Foreman bug:

http://projects.theforeman.org/issues/20271/

Comment 1 Adam Mariš 2017-07-20 09:56:34 UTC

Acknowledgments:

Name: Tomer Brisker (Red Hat)

Comment 2 Siddharth Sharma 2017-07-20 10:22:13 UTC

Analysis:

ruby193-rubygem-safemode shipped in Red Hat Ceph Storage 1.3 is in tech preview and would be used only when installing ceph with foreman installer. Installing ceph via ceph-deploy does not use ruby193-rubygem-safemode.