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V-256789

CAT II (Medium)

vSphere UI must have Multipurpose Internet Mail Extensions (MIME) that invoke operating system shell programs disabled.

Rule ID

SV-256789r889366_rule

STIG

VMware vSphere 7.0 vCenter Appliance UI Security Technical Implementation Guide

Version

V1R2

CCIs

CCI-000381

Discussion

MIME mappings tell the vSphere UI what type of program various file types and extensions are and what external utilities or programs are needed to execute the file type. By ensuring various shell script MIME types are not included in "web.xml", the server is protected against malicious users tricking the server into executing shell command files.

Check Content

At the command prompt, run the following command: 
 
# grep -En '(x-csh<)|(x-sh<)|(x-shar<)|(x-ksh<)' /usr/lib/vmware-vsphere-ui/server/conf/web.xml 
 
If the command produces any output, this is a finding.

Fix Text

Navigate to and open: 
 
/usr/lib/vmware-vsphere-ui/server/conf/web.xml 
 
Remove all of the following nodes lines: 
 
<mime-type>application/x-csh</mime-type> 
<mime-type>application/x-shar</mime-type> 
<mime-type>application/x-sh</mime-type> 
<mime-type>application/x-ksh</mime-type> 
 
Restart the service with the following command: 
 
# vmon-cli --restart vsphere-ui 
 
Note: Delete the entire mime-mapping node for the target mime-type. 
 
Example: 
 
<mime-mapping> 
    <extension>sh</extension> 
    <mime-type>application/x-sh</mime-type> 
</mime-mapping>