II - Mission Support Classified
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000074-GPOS-00042
Group -
The Red Hat Enterprise Linux operating system must be configured so that the SSH daemon is configured to only use the SSHv2 protocol.
SSHv1 is an insecure implementation of the SSH protocol and has many well-known vulnerability exploits. Exploits of the SSH daemon could provide immediate root access to the system. Satisfies: SRG...Rule High Severity -
SRG-OS-000250-GPOS-00093
Group -
The Red Hat Enterprise Linux operating system must be configured so that the SSH daemon is configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms.
DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions. The only SSHv2 hash algorithm meeting this requirement is SHA. The system will attempt to use the firs...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must be configured so that the SSH public host key files have mode 0644 or less permissive.
If a public host key file is modified by an unauthorized user, the SSH service may be compromised.Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must be configured so that the SSH private host key files have mode 0640 or less permissive.
If an unauthorized user obtains the private SSH host key file, the host could be impersonated.Rule Medium Severity -
SRG-OS-000364-GPOS-00151
Group -
The Red Hat Enterprise Linux operating system must be configured so that the SSH daemon does not permit Generic Security Service Application Program Interface (GSSAPI) authentication unless needed.
GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system's GSSAPI to remote hosts, increasing the...Rule Medium Severity -
SRG-OS-000364-GPOS-00151
Group -
The Red Hat Enterprise Linux operating system must be configured so that the SSH daemon does not permit Kerberos authentication unless needed.
Kerberos authentication for SSH is often implemented using Generic Security Service Application Program Interface (GSSAPI). If Kerberos is enabled through SSH, the SSH daemon provides a means of ac...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must be configured so that the SSH daemon performs strict mode checking of home directory configuration files.
If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as another user.Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must be configured so that the SSH daemon uses privilege separation.
SSH daemon privilege separation causes the SSH process to drop root privileges when not needed, which would decrease the impact of software vulnerabilities in the unprivileged section.Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must be configured so that the SSH daemon does not allow compression or only allows compression after successful authentication.
If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection, pote...Rule Medium Severity -
SRG-OS-000355-GPOS-00143
Group -
The Red Hat Enterprise 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).
Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when condu...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must enable an application firewall, if available.
Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network. S...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must display the date and time of the last successful account logon upon logon.
Providing users with feedback on when account accesses last occurred facilitates user recognition and reporting of unauthorized account use.Rule Low Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must not contain .shosts files.
The .shosts files are used to configure host-based authentication for individual users or the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the s...Rule High Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must not contain shosts.equiv files.
The shosts.equiv files are used to configure host-based authentication for the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it do...Rule High Severity -
SRG-OS-000480-GPOS-00227
Group -
For Red Hat Enterprise Linux operating systems using DNS resolution, at least two name servers must be configured.
To provide availability for name resolution services, multiple redundant name servers are mandated. A failure in name resolution could lead to the failure of security functions requiring name resol...Rule Low Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must not forward Internet Protocol version 4 (IPv4) source-routed packets.
Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security me...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must use a reverse-path filter for IPv4 network traffic when possible on all interfaces.
Enabling reverse path filtering drops packets with source addresses that should not have been able to be received on the interface they were received on. It should not be used on systems that are r...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must use a reverse-path filter for IPv4 network traffic when possible by default.
Enabling reverse path filtering drops packets with source addresses that should not have been able to be received on the interface they were received on. It should not be used on systems which are ...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must not forward Internet Protocol version 4 (IPv4) source-routed packets by default.
Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security me...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must not respond to Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted.
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An ill...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must ignore Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages.
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An ill...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must not allow interfaces to perform Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects by default.
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly r...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
The Red Hat Enterprise Linux operating system must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects.
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly r...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
Group -
Network interfaces configured on the Red Hat Enterprise Linux operating system must not be in promiscuous mode.
Network interfaces in promiscuous mode allow for the capture of all network traffic visible to the system. If unauthorized individuals can access these applications, it may allow then to collect in...Rule Medium Severity
Node 2
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