STIGQter: STIG Summary: IBM z/OS ACF2 Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021:

IBM z/OS SSL encryption options for the TN3270 Telnet Server must be specified properly for each statement that defines a SECUREPORT or within the TELNETGLOBALS.

DISA Rule

SV-223610r533198_rule

Vulnerability Number

V-223610

Group Title

SRG-OS-000033-GPOS-00014

Rule Version

ACF2-TN-000030

Severity

CAT II

CCI(s)

• CCI-000068 - The information system implements cryptographic mechanisms to protect the confidentiality of remote access sessions.
• CCI-000803 - The information system implements mechanisms for authentication to a cryptographic module that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.
• CCI-001453 - The information system implements cryptographic mechanisms to protect the integrity of remote access sessions.
• CCI-002420 - The information system maintains the confidentiality and/or integrity of information during preparation for transmission.
• CCI-002421 - The information system implements cryptographic mechanisms to prevent unauthorized disclosure of information and/or detect changes to information during transmission unless otherwise protected by organization-defined alternative physical safeguards.
• CCI-002422 - The information system maintains the confidentiality and/or integrity of information during reception.
• CCI-002450 - The information system implements organization-defined cryptographic uses and type of cryptography required for each use in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards.
• CCI-002890 - The information system implements cryptographic mechanisms to protect the integrity of nonlocal maintenance and diagnostic communications.
• CCI-003123 - The information system implements cryptographic mechanisms to protect the confidentiality of nonlocal maintenance and diagnostic communications.
• CCI-002418 - The information system protects the confidentiality and/or integrity of transmitted information.

Weight

10

Fix Recommendation

Configure the SECUREPORT and TELNETPARMS ENCRYPTION statements and/or the TELNETGLOBALS statement in the PROFILE.TCPIP file to conform to the requirements specified below.

The TELNETGLOBALS block may specify an ENCRYPTION statement that specifies one or more of the below cipher specifications.

Each TELNETPARMS block that specifies the SECUREPORT statement, an ENCRYPTION statement is coded with one or more of the below cipher specifications, and the TELNETGLOBALS block does or does not specify an ENCRYPTION statement.

To prevent the use of non FIPS 140-2 encryption, the TELNETGLOBALS block and/or each TELNETPARMS block that specifies an ENCRYPTION statement will specify one or more of the following cipher specifications:

Cipher Specifications
SSL_3DES_SHA
SSL_AES_256_SHA
SSL_AES_128_SHA

Note: Always check for the minimum allowed in FIPS 140-2.

Check Contents

Refer to the Profile configuration file specified on the PROFILE DD statement in the TCPIP started task JCL.

If the following items are in effect for the configuration specified in the TCP/IP Profile configuration file, this is not a finding.

NOTE: If an INCLUDE statement is coded in the TCP/IP Profile configuration file, the data set specified on this statement must be checked for the following items as well.

NOTE: FIPS 140-2 minimum encryption is the accepted level of encryption and will override this requirement if greater.

The TELNETGLOBALS block that specifies an ENCRYPTION statement states one or more of the below cipher specifications.

Each TELNETPARMS block that specifies the SECUREPORT statement, specifies an ENCRYPTION statement that states one or more of the below cipher specifications, and the TELNETGLOBALS block does or does not specify an ENCRYPTION statement.

Cipher Specifications
SSL_3DES_SHA
SSL_AES_256_SHA
SSL_AES_128_SHA

Vulnerability Number

V-223610

Documentable

False

Rule Version

ACF2-TN-000030

Severity Override Guidance

Refer to the Profile configuration file specified on the PROFILE DD statement in the TCPIP started task JCL.

If the following items are in effect for the configuration specified in the TCP/IP Profile configuration file, this is not a finding.

NOTE: If an INCLUDE statement is coded in the TCP/IP Profile configuration file, the data set specified on this statement must be checked for the following items as well.

NOTE: FIPS 140-2 minimum encryption is the accepted level of encryption and will override this requirement if greater.

The TELNETGLOBALS block that specifies an ENCRYPTION statement states one or more of the below cipher specifications.

Each TELNETPARMS block that specifies the SECUREPORT statement, specifies an ENCRYPTION statement that states one or more of the below cipher specifications, and the TELNETGLOBALS block does or does not specify an ENCRYPTION statement.

Cipher Specifications
SSL_3DES_SHA
SSL_AES_256_SHA
SSL_AES_128_SHA

Check Content Reference

M

Target Key

4100

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