Rule ID
SV-224494r1144703_rule
Version
V7R2
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.
Refer to the following report produced by the z/OS Data Collection: - EXAM.RPT(CICSPROC). Refer to the following report produced by the CICS Data Collection: - CICS.RPT(DFHSITxx). Refer to the CICS Systems Programmer Worksheets filled out from previous vulnerability ZCIC0010. Refer to the CICS region SYSLOG - (Alternate source of SIT parameters) be sure to process DFHSIT based on the order specified. 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). Verify the following CICS System Initialization Table (SIT) parameter settings are specified for each CICS region. If the following guidance is true, this is not a finding. 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 is the hex and bit settings for this flag. X'80' EQU B'10000000' External Security Requested 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 is the hex and bit settings for this flag. X'04' EQU B'00000100' Surrogate User Checking required 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. Verify 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. XTRAN=YES|ssrrTRN - If XTRAN is not coded in the CICS region startup JCL, go to offset x'CA' from the beginning on the SIT dump (record sequence number - 6) for a length of 7 bytes. The value will be the resource class name used for that region. If XTRAN=YES is coded, c'CICSTRN' will be present. SECPRFX=YES - If SECPRFX 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 the hex and bit settings for this flag. X'40' EQU B'01000000' Resource Prefix Required If XTRAN=ssrrTRN is specified, resource prefixing (e.g., SECPRFX=YES) is not required to be enabled. Also, CICS regions cannot share the same resource class if resource prefixing is not active.
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).
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 is 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 is 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 the hex 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.
XTRAN=YES|ssrrTRN - If XTRAN is not coded in the CICS region startup JCL, go to offset x'CA' from the beginning on the SIT dump (record sequence number - 6) for a length of 7 bytes. The value will be the resource class name used for that region. If XTRAN=YES is coded, c'CICSTRN' will be present.
SECPRFX=YES - If SECPRFX 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 the hex and bit settings for this flag with the resource prefixing setting bolded:
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
Note: If XTRAN=ssrrTRN is specified, resource prefixing (e.g., SECPRFX=YES) is not required to be enabled. Also, CICS regions cannot share the same resource class if resource prefixing is not active.