{"description": "The pam_pwquality module's <tt>maxrepeat</tt> parameter controls requirements for\nconsecutive repeating characters. When set to a positive number, it will reject passwords\nwhich contain more than that number of consecutive characters. Modify the <tt>maxrepeat</tt> setting\nin <tt>/etc/security/pwquality.conf</tt> to equal <sub idref=\"var_password_pam_maxrepeat\" /> to prevent a\nrun of (<sub idref=\"var_password_pam_maxrepeat\" /> + 1) or more identical characters.", "rationale": "Use of a complex password helps to increase the time and resources required to compromise the password.\nPassword complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at\nguessing and brute-force attacks.\n<br /><br />\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more\ncomplex the password, the greater the number of possible combinations that need to be tested before the\npassword is compromised.\n<br /><br />\nPasswords with excessive repeating characters may be more vulnerable to password-guessing attacks.", "severity": "medium", "references": {"cis-csc": ["1", "12", "15", "16", "5"], "cobit5": ["DSS05.04", "DSS05.05", "DSS05.07", "DSS05.10", "DSS06.03", "DSS06.10"], "isa-62443-2009": ["4.3.3.2.2", "4.3.3.5.1", "4.3.3.5.2", "4.3.3.6.1", "4.3.3.6.2", "4.3.3.6.3", "4.3.3.6.4", "4.3.3.6.5", "4.3.3.6.6", "4.3.3.6.7", "4.3.3.6.8", "4.3.3.6.9", "4.3.3.7.2", "4.3.3.7.4"], "isa-62443-2013": ["SR 1.1", "SR 1.10", "SR 1.2", "SR 1.3", "SR 1.4", "SR 1.5", "SR 1.7", "SR 1.8", "SR 1.9", "SR 2.1"], "iso27001-2013": ["A.18.1.4", "A.7.1.1", "A.9.2.1", "A.9.2.2", "A.9.2.3", "A.9.2.4", "A.9.2.6", "A.9.3.1", "A.9.4.2", "A.9.4.3"], "nist": ["IA-5(c)", "CM-6(a)", "IA-5(4)"], "nist-csf": ["PR.AC-1", "PR.AC-6", "PR.AC-7"], "srg": ["SRG-OS-000072-GPOS-00040"], "cis": ["5.3.3.2.4"]}, "control_references": {"cis": ["5.3.3.2.4"]}, "components": [], "identifiers": {}, "ocil_clause": "the value of \"maxrepeat\" is set to more than \"<sub idref=\"var_password_pam_maxrepeat\" />\" or is commented out", "ocil": "Verify the value of the \"maxrepeat\" option in \"/etc/security/pwquality.conf\" with the following command:\n\n<pre>$ grep maxrepeat /etc/security/pwquality.conf\n\nmaxrepeat = <sub idref=\"var_password_pam_maxrepeat\" /></pre>", "oval_external_content": null, "fixtext": "Configure Ubuntu 22.04 to require the change of the number of repeating consecutive characters when passwords are changed by setting the \"maxrepeat\" option.\n\nAdd the following line to \"/etc/security/pwquality.conf\" (or modify the line to have the required value):\n\nmaxrepeat = <sub idref=\"var_password_pam_maxrepeat\" />", "checktext": "", "vuldiscussion": "", "srg_requirement": "Ubuntu 22.04 must require the maximum number of repeating characters be limited to three when passwords are changed.", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {"stig": {"srg_requirement": "Ubuntu 22.04 must require the maximum number of repeating characters be limited to three when passwords are changed.", "vuldiscussion": "Use of a complex password helps to increase the time and resources required to compromise the password.\nPassword complexity, or strength, is a measure of the effectiveness of a password in resisting\nattempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The\nmore complex a password, the greater the number of possible combinations that need to be tested before the\npassword is compromised.", "checktext": "Verify the value of the \"maxrepeat\" option in \"/etc/security/pwquality.conf\" with the following command:\n\n$ grep maxrepeat /etc/security/pwquality.conf\n\nmaxrepeat = 3\n\nIf the value of \"maxrepeat\" is set to more than \"3\" or is commented out, this is a finding.", "fixtext": "Configure Ubuntu 22.04 to require the change of the number of repeating consecutive characters when passwords are changed by setting the \"maxrepeat\" option.\n\nAdd the following line to \"/etc/security/pwquality.conf\" (or modify the line to have the required value):\n\nmaxrepeat = 3"}}, "platform": "package[libpwquality]", "platforms": ["package[libpwquality]"], "sce_metadata": {}, "inherited_platforms": ["system_with_kernel"], "cpe_platform_names": ["package_libpwquality"], "inherited_cpe_platform_names": ["system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "Set Password Maximum Consecutive Repeating Characters", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/accounts/accounts-pam/password_quality/password_quality_pwquality/accounts_password_pam_maxrepeat/rule.yml", "template": {"name": "accounts_password", "vars": {"variable": "maxrepeat", "operation": "less than or equal"}, "backends": {}}}