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Main page Software Security Checklist Issue Handling Advisories Notes On Risk Advisory Template More


Title:       EGI SVG 'ADVISORY' [TLP:WHITE] 'CRITICAL' risk vulnerability - 
             Command injection via DHCP response CVE-2018-1111  [EGI-SVG-CVE-2018-1111]

Date:        2018-05-16

Affected software and risk

CRITICAL risk vulnerability concerning NetworkManager integration script included in the 
DHCP client packages in RedHat Enterprise Linux and derivatives. 

Package : DHCP Client Script (dhclient)
CVE ID  : CVE-2018-1111
Bug ID  : 

A command injection flaw was found in a script included in the DHCP client (dhclient) packages 
in Red Hat Enterprise Linux 6 and 7. A malicious DHCP server, or an attacker on the local network 
able to spoof DHCP responses, could use this flaw to execute arbitrary commands with root privileges 
on systems using NetworkManager with DHCP enabled. [R 1] 

Actions required/recommended

Sites running RedHat 6 and 7 and their derivatives are required to urgently apply vendor updates

All running resources MUST be either patched or have mitigation
in place or software removed by 2018-05-24  00:00 UTC

Sites failing to act and/or failing to respond to requests from the EGI CSIRT team risk site suspension. 

Component installation information

Sites running Red should see [R 2]

Sites running Scientific linux should see [R 3] 

Sites running CentOS should see [R 4]

There is no information yet concerning whether Debian or Ubuntu are affected.  


It is also possible to manually fix the vulnerable script by replacing ```while read opt``` with ```while read -r opt``` on line 10 of:
- /etc/NetworkManager/dispatcher.d/10-dhclient on RHEL6 & derivatives
- /etc/NetworkManager/dispatcher.d/11-dhclient on RHEL7 & derivatives

However, we strongly advise sites to simply update the package, to avoid any complication.


** WHITE information - Unlimited distribution 
  - see for distribution restrictions**                      


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


Comments or questions should be sent to svg-rat  at

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
the EGI Software Vulnerability Group will take a look according to the procedure defined in [R 5]  

Note that this has been updated and the latest version approved by the Operations Management Board in November 2017


[R 1]

[R 2]

[R 3]

[R 4]

[R 5]


SVG was alerted to this vulnerability by Vincent Brillault

Yyyy-mm-dd  [EGI-SVG-2018-CVE-2018-1111] 

2018-05-15 (evening) SVG alerted to this issue by Vincent Brillault
2018-05-15 Acknowledgement from the EGI SVG to the reporter
2018-05-16 EGI SVG Risk Assessment completed
2018-05-16 Advisory sent to sites


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 5]  
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 Software Vulnerability Group

On behalf of the EGI SVG,