Oracle Linux 7 Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must use a reverse-path filter for IPv4 network traffic when possible by default.
<VulnDiscussion>Enabling reverse path filtering drops packets with invalid source addresses received on the interface. It should not be used ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not forward Internet Protocol version 4 (IPv4) source-routed packets by default.
<VulnDiscussion>Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than c...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not respond to Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
<VulnDiscussion>Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.</VulnDi...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must ignore Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not allow interfaces to perform Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects by default.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects.
<VulnDiscussion>ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. Thes...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
Network interfaces configured on The Oracle Linux operating system must not be in promiscuous mode.
<VulnDiscussion>Network interfaces in promiscuous mode allow for the capture of all network traffic visible to the system. If unauthorized in...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured to prevent unrestricted mail relaying.
<VulnDiscussion>If unrestricted mail relaying is permitted, unauthorized senders could use this host as a mail relay for the purpose of sendi...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not have a File Transfer Protocol (FTP) server package installed unless needed.
<VulnDiscussion>The FTP service provides an unencrypted remote access that does not provide for the confidentiality and integrity of user pas...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not have the Trivial File Transfer Protocol (TFTP) server package installed if not required for operational support.
<VulnDiscussion>If TFTP is required for operational support (such as the transmission of router configurations) its use must be documented wi...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that remote X connections are disabled, unless to fulfill documented and validated mission requirements.
<VulnDiscussion>The security risk of using X11 forwarding is that the client's X11 display server may be exposed to attack when the SSH clien...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that if the Trivial File Transfer Protocol (TFTP) server is required, the TFTP daemon is configured to operate in secure mode.
<VulnDiscussion>Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files.</V...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not have a graphical display manager installed unless approved.
<VulnDiscussion>Internet services not required for system or application processes must not be active to decrease the attack surface of the s...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not be performing packet forwarding unless the system is a router.
<VulnDiscussion>Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this s...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that the Network File System (NFS) is configured to use RPCSEC_GSS.
<VulnDiscussion>When an NFS server is configured to use RPCSEC_SYS, a selected userid and groupid are used to handle requests from the remote...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
SNMP community strings on the Oracle Linux operating system must be changed from the default.
<VulnDiscussion>Whether active or not, default Simple Network Management Protocol (SNMP) community strings must be changed to maintain securi...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system access control program must be configured to grant or deny system access to specific hosts and services.
<VulnDiscussion>If the systems access control program is not configured with appropriate rules for allowing and denying access to system netw...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not have unauthorized IP tunnels configured.
<VulnDiscussion>IP tunneling mechanisms can be used to bypass network filtering. If tunneling is required, it must be documented with the Inf...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not forward IPv6 source-routed packets.
<VulnDiscussion>Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than c...Rule Medium Severity -
SRG-OS-000105-GPOS-00052
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must have the required packages for multifactor authentication installed.
<VulnDiscussion>Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the...Rule Medium Severity -
SRG-OS-000375-GPOS-00160
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must implement multifactor authentication for access to privileged accounts via pluggable authentication modules (PAM).
<VulnDiscussion>Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the...Rule Medium Severity -
SRG-OS-000375-GPOS-00160
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must implement certificate status checking for PKI authentication.
<VulnDiscussion>Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the...Rule Medium Severity -
SRG-OS-000424-GPOS-00188
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that all wireless network adapters are disabled.
<VulnDiscussion>The use of wireless networking can introduce many different attack vectors into the organization's network. Common attack vec...Rule Medium Severity -
SRG-OS-000057-GPOS-00027
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must protect audit information from unauthorized read, modification, or deletion.
<VulnDiscussion>If audit information were to become compromised, then forensic analysis and discovery of the true source of potentially malic...Rule Medium Severity
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