Bug 1439696

Summary:	CVE-2017-7418 proftpd: AllowChrootSymlinks control bypass [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Andrej Nemec <anemec>
Component:	proftpd	Assignee:	Itamar Reis Peixoto <itamar>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	epel7	CC:	itamar, matthias, paul
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	proftpd-1.3.5e-2.el7	Doc Type:	Release Note
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-05-19 14:57:32 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:
Bug Blocks:	1439693

Description Andrej Nemec 2017-04-06 12:10:23 UTC

This is an automatically created tracking bug!  It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of epel-all.

For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.

For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs

When submitting as an update, use the fedpkg template provided in the next
comment(s).  This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.

Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.

NOTE: this issue affects multiple supported versions of Fedora EPEL. While
only one tracking bug has been filed, please correct all affected versions
at the same time.  If you need to fix the versions independent of each
other, you may clone this bug as appropriate.

Comment 1 Andrej Nemec 2017-04-06 12:10:28 UTC

Use the following template to for the 'fedpkg update' request to submit an
update for this issue as it contains the top-level parent bug(s) as well as
this tracking bug.  This will ensure that all associated bugs get updated
when new packages are pushed to stable.

=====

# bugfix, security, enhancement, newpackage (required)
type=security

# testing, stable
request=testing

# Bug numbers: 1234,9876
bugs=1439693

# Description of your update
notes=Security fix for [PUT CVEs HERE]

# Enable request automation based on the stable/unstable karma thresholds
autokarma=True
stable_karma=3
unstable_karma=-3

# Automatically close bugs when this marked as stable
close_bugs=True

# Suggest that users restart after update
suggest_reboot=False

======

Additionally, you may opt to use the bodhi web interface to submit updates:

https://bodhi.fedoraproject.org/updates/new

Comment 2 Fedora Update System 2017-04-10 15:37:28 UTC

proftpd-1.3.5e-1.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2017-b9db4ff3ec

Comment 3 Fedora Update System 2017-04-10 21:49:26 UTC

proftpd-1.3.5e-1.el7 has been pushed to the Fedora EPEL 7 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2017-b9db4ff3ec

Comment 4 Paul Howarth 2017-04-11 09:53:24 UTC

The AllowChrootSymlinks directive was introduced in proftpd version 1.3.5.

The version of proftpd shipped in EPEL-6 is 1.3.3g, which therefore does not support this directive; it is effectively the same as "AllowChrootSymlinks yes" in current proftpd versions (which is the default).

I currently do not intend to issue an update for EPEL-6 for this issue; users of proftpd from EPEL-6 should take care to ensure that there are no directory elements between the root directory and their users' home directories that could be renamed/overwritten by non-root local users, either symbolic links or real directories. These would present a general security issue anyway, not just for proftpd.

Upstream documentation:
http://www.proftpd.org/docs/modules/mod_auth.html#AllowChrootSymlinks
http://www.proftpd.org/docs/howto/Chroot.html
http://bugs.proftpd.org/show_bug.cgi?id=4295

Comment 5 Fedora Update System 2017-05-03 15:11:47 UTC

proftpd-1.3.5e-2.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2017-f057518fbd

Comment 6 Fedora Update System 2017-05-04 18:55:16 UTC

proftpd-1.3.5e-2.el7 has been pushed to the Fedora EPEL 7 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2017-f057518fbd

Comment 7 Fedora Update System 2017-05-19 14:57:32 UTC

proftpd-1.3.5e-2.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.