Check: OL6-00-000099
Oracle Linux 6 STIG:
OL6-00-000099
(in versions v2 r7 through v1 r9)
Title
The system must ignore ICMPv6 redirects by default. (Cat II impact)
Discussion
An illicit ICMP redirect message could result in a man-in-the-middle attack.
Check Content
If IPv6 is disabled, this is not applicable. The status of the "net.ipv6.conf.default.accept_redirects" kernel parameter can be queried by running the following command: $ sysctl net.ipv6.conf.default.accept_redirects The output of the command should indicate a value of "0". If this value is not the default value, investigate how it could have been adjusted at runtime, and verify it is not set improperly in "/etc/sysctl.conf". $ grep net.ipv6.conf.default.accept_redirects /etc/sysctl.conf If the correct value is not returned, this is a finding.
Fix Text
To set the runtime status of the "net.ipv6.conf.default.accept_redirects" kernel parameter, run the following command: # sysctl -w net.ipv6.conf.default.accept_redirects=0 If this is not the system's default value, add the following line to "/etc/sysctl.conf": net.ipv6.conf.default.accept_redirects = 0
Additional Identifiers
Rule ID: SV-208865r793650_rule
Vulnerability ID: V-208865
Group Title: SRG-OS-000480
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |