II - Mission Support Public
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that the SSH public host key files have mode 0644 or less permissive.
<VulnDiscussion>If a public host key file is modified by an unauthorized user, the SSH service may be compromised.</VulnDiscussion><...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so the SSH private host key files have mode 0640 or less permissive.
<VulnDiscussion>If an unauthorized user obtains the private SSH host key file, the host could be impersonated.</VulnDiscussion><Fals...Rule Medium Severity -
SRG-OS-000364-GPOS-00151
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that the SSH daemon does not permit Generic Security Service Application Program Interface (GSSAPI) authentication unless needed.
<VulnDiscussion>GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication...Rule Medium Severity -
SRG-OS-000364-GPOS-00151
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that the SSH daemon does not permit Kerberos authentication unless needed.
<VulnDiscussion>Kerberos authentication for SSH is often implemented using Generic Security Service Application Program Interface (GSSAPI). I...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that the SSH daemon performs strict mode checking of home directory configuration files.
<VulnDiscussion>If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as anoth...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that the SSH daemon uses privilege separation.
<VulnDiscussion>SSH daemon privilege separation causes the SSH process to drop root privileges when not needed, which would decrease the impa...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must be configured so that the SSH daemon does not allow compression or only allows compression after successful authentication.
<VulnDiscussion>If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could res...Rule Medium Severity -
SRG-OS-000355-GPOS-00143
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must, for networked systems, synchronize clocks with a server that is synchronized to one of the redundant United States Naval Observatory (USNO) time servers, a time server designated for the appropriate DoD network (NIPRNet/SIPRNet), and/or the Global Positioning System (GPS).
<VulnDiscussion>Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the cor...Rule Medium Severity -
SRG-OS-000420-GPOS-00186
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must protect against or limit the effects of Denial of Service (DoS) attacks by validating the operating system is implementing rate-limiting measures on impacted network interfaces.
<VulnDiscussion>DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot ac...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must enable an application firewall, if available.
<VulnDiscussion>Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must display the date and time of the last successful account logon upon logon.
<VulnDiscussion>Providing users with feedback on when account accesses last occurred facilitates user recognition and reporting of unauthoriz...Rule Low Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not contain .shosts files.
<VulnDiscussion>The .shosts files are used to configure host-based authentication for individual users or the system via SSH. Host-based auth...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
The Oracle Linux operating system must not contain shosts.equiv files.
<VulnDiscussion>The shosts.equiv files are used to configure host-based authentication for the system via SSH. Host-based authentication is n...Rule High Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
For Oracle Linux operating systems using DNS resolution, at least two name servers must be configured.
<VulnDiscussion>To provide availability for name resolution services, multiple redundant name servers are mandated. A failure in name resolut...Rule Low 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.
<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 use a reverse-path filter for IPv4 network traffic when possible on all interfaces.
<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 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
Node 2
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