Bug 1308871

Summary:	cloud-init: Following symlinks for ssh authorized_keys
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	adimania, apevec, dkholia, gholms, Jan.van.Eldik, jgreguske, lars, mattdm, shardy, s
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-06-02 04:31:57 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1308874, 1308875
Bug Blocks:	1308877

Description Adam Mariš 2016-02-16 10:30:17 UTC

It was found that SSH key handling code follows symlinks, allowing malicious user to create symlink from ~/.ssh pointing to arbitrary place.

CVE request:

http://seclists.org/oss-sec/2016/q1/336

Comment 1 Adam Mariš 2016-02-16 10:37:56 UTC

Created cloud-init tracking bugs for this issue:

Affects: fedora-all [bug 1308874]
Affects: epel-all [bug 1308875]

Comment 2 Dhiru Kholia 2016-06-02 04:31:57 UTC

There is no realistic attack vector here (the bug report assumes that an unprivileged user can write to a different user's directories). Hence closing the bug.