CICS System Initialization Table (SIT) parameter values must be specified in accordance with proper security requirements.

An XCCDF Rule

Description

<VulnDiscussion>The CICS SIT is used to define system operation and configuration parameters of a CICS system. Several of these parameters control the security within a CICS region. Failure to code the appropriate values could result in unexpected operations and degraded security. This exposure may result in unauthorized access impacting the confidentiality, integrity, and availability of the CICS region, applications, and customer data.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>

ID: SV-224304r868098_rule
Severity: Medium
References: CCI-000366
Updated: 17 days ago

Ensure that CICS System Initialization Table (SIT) parameter values are specified using the following guidance.

The system initialization parameters are processed in the following order, with later system initialization parameter values overriding those specified earlier. CICS system initialization parameters are specified in the following ways:

- In the system initialization table, loaded from a library in the STEPLIB concatenation of the CICS startup procedure.
- In the PARM parameter of the EXEC PGM=DFHSIP statement of the CICS startup procedure.- In the SYSIN data set defined in the startup procedure (but only if SYSIN is coded in the PARM parameter).
- In the ACF2PARM data set defined in the startup procedure.

Ensure the following CICS System Initialization Table (SIT) parameter settings are specified for each CICS region:

SEC=YES - If SEC is not coded in the CICS region startup JCL, go to offset x'117' from the beginning on the SIT dump (record sequence number - 6) for a length of 1. This is the security byte flag. Below are listed the hex and bit settings for this flag. 

X'80' EQU B'10000000' External Security Requested <<===
X'40' EQU B'01000000' Resource Prefix Required
X'10' EQU B'00010000' RACLIST class APPCLU required
X'08' EQU B'00001000' ESM INSTLN data is required
X'04' EQU B'00000100' Surrogate User Checking required
X'02' EQU B'00000010' Always enact resource check
X'01' EQU B'00000001' Always enact command check

DFLTUSER=<parameter> - If DFLTUSER is not coded in the CICS region startup JCL, go to offset x'118' from the beginning on the SIT dump (record sequence number - 6) for a length of 8 bytes. The value will be the CICS default userid.

XUSER=YES - If XUSER is not coded in the CICS region startup JCL, go to offset x'117' from the beginning on the SIT dump (record sequence number - 6) for a length of 1. This is the security byte flag. Below are listed the hex and bit settings for this flag.

X'80' EQU B'10000000' External Security Requested
X'40' EQU B'01000000' Resource Prefix Required
X'10' EQU B'00010000' RACLIST class APPCLU required
X'08' EQU B'00001000' ESM INSTLN data is required
X'04' EQU B'00000100' Surrogate User Checking required <<===
X'02' EQU B'00000010' Always enact resource check
X'01' EQU B'00000001' Always enact command check

SNSCOPE=NONE|CICS|MVSIMAGE|SYSPLEX - If SNSCOPE is not coded in the CICS region startup JCL, go to offset x'124' from the beginning on the SIT dump (record sequence number - 6) for a length of 1. This is the signon scope byte flag. Ensure that users cannot sign on to more than one CICS production region within the scope of a single CICS region, a single z/OS image, or a sysplex. Below are listed the hex and bit settings for this flag:

X'01' EQU 1 SIGNON SCOPE = NONE
X'02' EQU 2 SIGNON SCOPE = CICS
X'03' EQU 3 SIGNON SCOPE = MVSIMAGE
X'04' EQU 4 SIGNON SCOPE = SYSPLEX

NOTE: SNSCOPE=NONE is only allowed with test/development regions.

CICS System Initialization Table (SIT) parameter values must be specified in accordance with proper security requirements.

Description

Remediation - Manual Procedure