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SVG:Advisory-SVG-CVE-2019-11328

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Advisory-SVG-CVE-2019-11328



Title:       EGI SVG 'ADVISORY' [TLP:WHITE] HIGH risk **UPDATE**  Singularity Vulnerability announced by 
             the Singularity team [EGI-SVG-CVE-2019-11328]  

Date:       2019-05-16
Updated:    2019-05-22, 2019-06-20


Affected software and risk
==========================

HIGH risk vulnerability concerning Singularity

Package : Singularity 

See OSG team information and [R 5]

Actions required/recommended
============================

Sites running singularity should take action as described below, in the OSG information, if they have not 
done so already. 

**UPDATE 2019-06-20**

Singularity 3.2.1 is now available in EPEL [R 6], and updating to this is an alternative to the instructions 
in the OSG team information below. 

OSG team information
====================

Subject: OSG-SEC-2019-05-14 Vulnerability in Singularity 
 
Dear OSG users,
 
Impacted:  Singularity 3.x.x, all versions
Severity:   High

The OSG Security Team wants to inform you that a high severity vulnerability has been announced for 
privileged installations of all Singularity 3.x.x versions.  A new version with a fix to the vulnerability 
is being prepared by OSG.  The current primary Singularity version supported by OSG, version 2.6.1, is not vulnerable.  
OSG does however support a 3.x.x version in the osg-upcoming yum repository and some sites have installed it.

We will send a follow up announcement when a new version is available, but meanwhile there is a mitigation, below.

WHAT YOU SHOULD DO:
If you are using privileged Singularity 3.x.x on a RHEL7-based distribution, while waiting for the new version
 either downgrade to version 2.6.1 or enable unprivileged Singularity [1] and set 

    allow setuid = no

in singularity.conf.  

If you are using Singularity 3.x.x on a RHEL6-based distribution, downgrade to version 2.6.1.

HOW IT WORKS:
A malicious user with local/network access to the host system (e.g. ssh) could exploit this vulnerability due 
to insecure permissions allowing a user to edit files within /run/singularity/instances/sing/<user>/<instance>.
 The manipulation of those files can change the behavior of the starter-suid program when instances are joined 
resulting in potential privilege escalation on the host [2] [3].

REFERENCES:

[1] https://opensciencegrid.org/docs/worker-node/install-singularity/#enabling-unprivileged-singularity
[2] https://github.com/sylabs/singularity/releases/tag/v3.2.0
[3] https://cve.mitre.org/cgi-bin/cvename.cgi?name=2019-11328




TLP and URL
===========

** WHITE information - Unlimited distribution 
     - see https://wiki.egi.eu/wiki/EGI_CSIRT:TLP for distribution restrictions **  

URL:   https://wiki.egi.eu/wiki/SVG:Advisory-SVG-CVE-2019-11328 

Minor updates may be made without re-distribution to the sites


Comments
========

Comments or questions should be sent to svg-rat  at  mailman.egi.eu

If you find or become aware of another vulnerability which is relevant to EGI you may report it by e-mail to  

report-vulnerability at egi.eu
 
the EGI Software Vulnerability Group will take a look according to the procedure defined in [R 4]  

Note that this is undergoing revision to fully handle vulnerabilities in the EOSC-hub era. 


References
==========

[R 4] https://documents.egi.eu/public/ShowDocument?docid=3145

[R 5] https://seclists.org/oss-sec/2019/q2/112

[R 6] https://dl.fedoraproject.org/pub/epel/7/x86_64/Packages/s/


Credit
======

SVG was alerted to this vulnerability by David Dykstra from FNAL / OSG.


Timeline  
========
Yyyy-mm-dd  [EGI-SVG-CVE-2019-11328] 

2019-05-07 SVG alerted to this issue by David Dykstra
2019-05-07 Acknowledgement from the EGI SVG to the reporter
2019-05-15 OSG sent announcement of the vulnerability with actions to take.
2019-05-16 SVG informed sites as 'AMBER', simply providing the OSG information. 
2019-05-22 Update to inform fixed version of Singularity in EPEL testing
2019-06-20 Update as fixed version of Singularity in EPEL, changed to [TLP:WHITE]

Context
=======

This advisory has been prepared as part of the effort to fulfil EGI SVG's purpose 
"To minimize the risk to the EGI infrastructure arising from software vulnerabilities"

The risk is that assessed by the group, according to the EGI SVG issue handling procedure [R 4]  in the context 
of how the software is used in the EGI infrastructure. It is the opinion of the group, we do not guarantee it 
to be correct. The risk may also be higher or lower in other deployments depending on how the software is used.   

Others may re-use this information provided they:-

1) Respect the provided TLP classification

2) Credit the EGI https://www.egi.eu/ Software Vulnerability Group

Note that the SVG issue handling procedure is currently under review, to take account of the increasing 
inhomogeneity of the EGI infrastructure and the services in the EOSC-hub catalogue.

On behalf of the EGI SVG,