Bug 1182542

Summary:	Memcache should listen only on localhost
Product:	[Fedora] Fedora	Reporter:	František Dvořák <valtri>
Component:	memcached	Assignee:	Miroslav Lichvar <mlichvar>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	23	CC:	jorton, lindner, matthias, mlichvar, ondrejj
Target Milestone:	---	Flags:	mlichvar: fedora_requires_release_note?
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	memcached-1.4.28-1.fc25	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-07-12 13:56:25 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description František Dvořák 2015-01-15 12:11:37 UTC

Description of problem:

By default memcached listens on all interfaces. It is recommended in documentation (manual page for memcached) to listen only on internal or firewalled interfaces.

We got some vulnerability reports when using memcached on Fedora and keeping it at default settings. You can consider to limit binding only to localhost interfaces. 


Version-Release number of selected component (if applicable):

memcached-1.4.17-3.fc21.x86_64


How reproducible:

always


Steps to Reproduce:
1. yum install memcached
2. service memcached start
3. netstat -utanp | grep memcache


Actual results:

tcp        0      0 0.0.0.0:11211           0.0.0.0:*               LISTEN      6815/memcached      
tcp6       0      0 :::11211                :::*                    LISTEN      6815/memcached      
udp        0      0 0.0.0.0:11211           0.0.0.0:*                           6815/memcached      
udp6       0      0 :::11211                :::*                                6815/memcached      


Expected results:

tcp        0      0 127.0.0.1:11211         0.0.0.0:*               LISTEN      6845/memcached      
tcp6       0      0 ::1:11211               :::*                    LISTEN      6845/memcached      
udp        0      0 127.0.0.1:11211         0.0.0.0:*                           6845/memcached      
udp6       0      0 ::1:11211               :::*                                6845/memcached      


Additional info:

It is possible to limit interfaces to localhost using:
 
OPTIONS="-l localhost"

in /etc/sysconfig/memcached. Note, it should be used "localhost", NOT "127.0.0.1". When using "localhost" it will listen also on ::1 (if specified in /etc/hosts/).

Comment 1 Fedora End Of Life 2015-11-04 14:08:22 UTC

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Comment 2 František Dvořák 2015-11-19 11:16:48 UTC

Still valid for memcached-1.4.17-4.fc23.x86_64.

Comment 3 Miroslav Lichvar 2016-07-12 13:56:25 UTC

The default configuration of memcached now uses -l 127.0.0.1,::1 to bind to the loopback interface.

It would be good to mention this in the Fedora 25 release notes.

Comment 4 Jan ONDREJ 2018-03-05 14:55:35 UTC

This is still a problem in EPEL/CentOS/Red Hat.
Can I open a new bug or change this one?
Is it possible to fix this in EPEL?

According to latest attacks from memcached, this should be fixed on all systems.
It's hard to fight with similar problems for network administrators,
which has no direct access to servers. :-(

Comment 5 Miroslav Lichvar 2018-03-05 16:02:05 UTC

For memcached in RHEL7, please see bug #1550066.