Apple iOS 11 Security Technical Implementation Guide

This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: [email protected]

Details

Version / Release: V1R4

Published: 2018-09-19

Updated At: 2018-11-03 10:27:43

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Drop CKL or SCAP (XCCDF) results here.

    Vuln Rule Version CCI Severity Title Description Status Finding Details Comments
    SV-93061r1_rule AIOS-11-000100 CCI-000205 LOW Apple iOS must enforce a minimum password length of six characters. Password strength is a measure of the effectiveness of a password in resisting guessing and brute force attacks. The ability to crack a password is a function of how many attempts an adversary is permitted, how quickly an adversary can do each attempt, an
    SV-93067r1_rule AIOS-11-000200 CCI-000366 LOW Apple iOS must not allow passwords that include more than two repeating or sequential characters. Password strength is a measure of the effectiveness of a password in resisting guessing and brute force attacks. Passwords that contain repeating or sequential characters are significantly easier to guess than those that do not contain repeating or sequen
    SV-93069r1_rule AIOS-11-000300 CCI-000057 MEDIUM Apple iOS must lock the display after 15 minutes (or less) of inactivity. The screen lock timeout must be set to a value that helps protect the device from unauthorized access. Having a too-long timeout would increase the window of opportunity for adversaries who gain physical access to the mobile device through loss, theft, et
    SV-93071r1_rule AIOS-11-000400 CCI-000044 LOW Apple iOS must not allow more than 10 consecutive failed authentication attempts. The more attempts an adversary has to guess a password, the more likely the adversary will enter the correct password and gain access to resources on the device. Setting a limit on the number of attempts mitigates this risk. Setting the limit at 10 or les
    SV-93073r1_rule AIOS-11-000900 CCI-000366 MEDIUM Apple iOS must be configured to enforce an application installation policy by specifying one or more authorized application repositories, including [selection: Apple App Store]. Forcing all applications to be installed from authorized application repositories can prevent unauthorized and malicious applications from being installed and executed on mobile devices. Allowing such installations and executions could cause a compromise
    SV-93075r1_rule AIOS-11-001200 CCI-000366 MEDIUM Apple iOS must not include applications with the following characteristics: Siri when the device is locked. On Apple iOS devices, users can access the device's contact database or calendar to obtain phone numbers and other information using a human voice even when the mobile device is locked. Often this information is Personally Identifiable Information (PII),
    SV-93077r1_rule AIOS-11-001300 CCI-000366 MEDIUM Apple iOS must not include applications with the following characteristics: Voice dialing application if available when MD is locked. On Apple iOS devices, users can access the device's contact database or calendar to obtain phone numbers and other information using a human voice even when the mobile device is locked. Often this information is Personally Identifiable Information (PII),
    SV-93079r1_rule AIOS-11-001700 CCI-001199 MEDIUM Apple iOS must not display notifications when the device is locked. Many mobile devices display notifications on the lock screen so that users can obtain relevant information in a timely manner without having to frequently unlock the phone to determine if there are new notifications. However, in many cases, these notifica
    SV-93081r1_rule AIOS-11-001800 CCI-001199 MEDIUM Apple iOS must not display notifications (calendar information) when the device is locked. Many mobile devices display notifications (including calendar information) on the lock screen so users can obtain relevant information in a timely manner without having to frequently unlock the phone to determine if there are new notifications. However, i
    SV-93087r1_rule AIOS-11-003500 CCI-000048 LOW Apple iOS must be configured to display the DoD advisory warning message at start-up or each time the user unlocks the device. Apple iOS is required to display the DoD-approved system use notification message or banner before granting access to the system that provides privacy and security notices consistent with applicable federal laws, Executive Orders, directives, policies, re
    SV-93089r1_rule AIOS-11-003900 CCI-000097 MEDIUM Apple iOS must not allow backup of managed app data to locally connected systems. Data on mobile devices is protected by numerous mechanisms, including user authentication, access control, and cryptography. When the data is backed up to an external system (either locally connected or cloud-based), many if not all of these mechanisms ar
    SV-93091r1_rule AIOS-11-004100 CCI-002338 MEDIUM Apple iOS must not allow backup to remote systems (iCloud). Backups to remote systems (including cloud backup) can leave data vulnerable to breach on the external systems, which often offer less protection than the MOS. Where the remote backup involves a cloud-based solution, the backup capability is often used to
    SV-93093r1_rule AIOS-11-004200 CCI-002338 MEDIUM Apple iOS must not allow backup to remote systems (iCloud document and data synchronization). Backups to remote systems (including cloud backup and cloud document syncing) can leave data vulnerable to breach on the external systems, which often offer less protection than the MOS. Where the remote backup involves a cloud-based solution, the backup
    SV-93095r1_rule AIOS-11-004300 CCI-002338 MEDIUM Apple iOS must not allow backup to remote systems (iCloud Keychain). The iCloud Keychain is an Apple iOS function that will store users' account names and passwords in iCloud and then synchronize this data among the users' Macs, iPhones, and iPads. An adversary may use any of the stored iCloud keychain passwords after unlo
    SV-93097r1_rule AIOS-11-004400 CCI-002338 MEDIUM Apple iOS must not allow backup to remote systems (My Photo Stream). When My Photo Stream is enabled, sensitive photos will be uploaded automatically to Apple-specified servers and available on other Apple iOS devices associated with the same Apple ID, provided that the other device also has My Photo Stream enabled. This p
    SV-93099r1_rule AIOS-11-004500 CCI-002338 MEDIUM Apple iOS must not allow backup to remote systems (iCloud Photo Sharing, also known as Shared Photo Streams). When iCloud Photo Sharing is enabled, sensitive photos will be uploaded automatically to Apple-specified servers and available on the Apple IOS devices of other users who have accepted invitations to participate in iCloud Photo Sharing. This potentially p
    SV-93101r1_rule AIOS-11-004600 CCI-002338 MEDIUM Apple iOS must not allow backup to remote systems (managed applications data stored in iCloud). Storing data with a non-DoD cloud provider may leave the data vulnerable to breach. Disabling non-DoD cloud services mitigates this risk. SFR ID: FMT_SMF_EXT.1.1 #40
    SV-93103r1_rule AIOS-11-005210 CCI-000366 MEDIUM Apple iOS must not allow non-DoD applications to access DoD data. Managed apps have been approved for the handling of DoD-sensitive information. Unmanaged apps are provided for productivity and morale purposes but are not approved to handle DoD-sensitive information. Examples of unmanaged apps include apps for news serv
    SV-93105r1_rule AIOS-11-005400 CCI-000381 LOW Apple iOS must disable automatic transfer of diagnostic data to an external device other than an MDM service with which the device has enrolled. Many software systems automatically send diagnostic data to the manufacturer or a third party. This data enables the developers to understand real-world field behavior and improve the product based on that information. Unfortunately, it can also reveal in
    SV-93107r1_rule AIOS-11-007200 CCI-000366 MEDIUM Apple iOS must implement the management setting: remove managed applications upon unenrollment from MDM (including sensitive and protected data). When a device is unenrolled from MDM, it is possible to relax the security policies that the MDM had implemented on the device. This may cause apps and data to be more vulnerable than they were prior to enrollment. Removing managed apps (and consequently
    SV-93109r1_rule AIOS-11-010800 CCI-002476 HIGH Apple iOS must require a valid password be successfully entered before the mobile device data is unencrypted. Passwords provide a form of access control that prevents unauthorized individuals from accessing computing resources and sensitive data. Passwords may also be a source of entropy for generation of key encryption or data encryption keys. If a password is n
    SV-93111r1_rule AIOS-11-010900 CCI-000366 LOW Apple iOS must implement the management setting: limit Ad Tracking. Ad Tracking refers to the advertisers' ability to categorize the device and spam the user with ads that are most relevant to the user's preferences. By not "Force limiting ad tracking", advertising companies are able to gather information about the user a
    SV-93113r1_rule AIOS-11-011000 CCI-000366 LOW Apple iOS must implement the management setting: not allow automatic completion of Safari browser passcodes. The AutoFill functionality in the Safari web browser allows the user to complete a form that contains sensitive information, such as PII, without previous knowledge of the information. By allowing the use of the AutoFill functionality, an adversary who le
    SV-93115r1_rule AIOS-11-011100 CCI-000366 MEDIUM Apple iOS must implement the management setting: Encrypt iTunes backups. When syncing an Apple iOS device to a computer running iTunes, iTunes will prompt the user to back up the Apple iOS device. If the performed backup is not encrypted, this could lead to the unauthorized disclosure of DoD-sensitive information if non-DoD pe
    SV-93117r1_rule AIOS-11-011200 CCI-002338 LOW Apple iOS must not allow backup to remote systems (enterprise books). Enterprise books may contain DoD-sensitive information. When enterprise books are backed up, they are vulnerable to attacks on the backup systems and media. Disabling the backup capability mitigates this risk. If such books are lost, accidentally deleted,
    SV-93119r1_rule AIOS-11-011300 CCI-000366 LOW Apple iOS must implement the management setting: not allow use of Handoff. Handoff permits a user of an Apple iOS device to transition user activities from one device to another. Handoff passes sufficient information between the devices to describe the activity, but app data synchronization associated with the activity is handle
    SV-93121r1_rule AIOS-11-011500 CCI-000366 LOW Apple iOS must implement the management setting: require the user to enter a password when connecting to an AirPlay-enabled device for the first time. When a user is allowed to use AirPlay without a password, there is the potential that it may mistakenly associate the Apple iOS device with an AirPlay-enabled device other than the one intended (i.e., by choosing the wrong one from the AirPlay list displa
    SV-93123r1_rule AIOS-11-011600 CCI-000366 MEDIUM Apple iOS must implement the management setting: Disable Allow MailDrop. MailDrop allows users to send large attachments up to 5 GB in size via iCloud. Storing data with a non-DoD cloud provider may leave the data vulnerable to breach. Disabling non-DoD cloud services mitigates this risk. SFR ID: FMT_SMF_EXT.1.1 #47
    SV-93125r1_rule AIOS-11-011700 CCI-000366 MEDIUM Apple iOS must implement the management setting: Disable Allow iCloud Photo Library. Storing data with a non-DoD cloud provider may leave the data vulnerable to breach. Disabling non-DoD cloud services mitigates this risk. Note: If the AO has approved the use/storage of DoD data in one or more personal (unmanaged) apps, allowing unrestri
    SV-93127r1_rule AIOS-11-011800 CCI-000366 HIGH Apple iOS device must have the latest available iOS operating system installed. Required security features are not available in earlier OS versions. In addition, there may be known vulnerabilities in earlier versions. SFR ID: FMT_SMF_EXT.1.1 #47
    SV-93129r1_rule AIOS-11-011900 CCI-000366 MEDIUM Apple iOS must implement the management setting: use SSL for Exchange ActiveSync. Exchange email messages are a form of data in transit and thus are vulnerable to eavesdropping and man-in-the-middle attacks. Secure Sockets Layer (SSL), also referred to as Transport Layer Security (TLS), provides encryption and authentication services t
    SV-93131r1_rule AIOS-11-012000 CCI-000366 MEDIUM Apple iOS must implement the management setting: not allow messages in an ActiveSync Exchange account to be forwarded or moved to other accounts in the Apple iOS Mail app. The Apple iOS Mail app can be configured to support multiple email accounts concurrently. These email accounts are likely to involve content of varying degrees of sensitivity (e.g., both personal and enterprise messages). To prevent the unauthorized and u
    SV-93133r1_rule AIOS-11-012100 CCI-000366 MEDIUM Apple iOS must implement the management setting: Treat Airdrop as an unmanaged destination. An Airdrop feature is a way to send contact information or photos to other users with this same feature enabled. This feature enables a possible attack vector for adversaries to exploit. Once the attacker has gained access to the information broadcast by
    SV-93135r1_rule AIOS-11-012200 CCI-000366 LOW Apple iOS must implement the management setting: not have any Family Members in Family Sharing. Apple's Family Sharing service allows Apple iOS users to create a Family Group whose members have several shared capabilities, including the ability to lock, wipe, play a sound on, or locate the Apple iOS devices of other members. Each member of the group
    SV-93137r1_rule AIOS-11-012300 CCI-000366 MEDIUM Apple iOS must implement the management setting: not share location data through iCloud. Sharing of location data is an operations security (OPSEC) risk because it potentially allows an adversary to determine a DoD user's location and movements and patterns in those movements over time. An adversary could use this information to target the us
    SV-93139r1_rule AIOS-11-012400 CCI-000366 MEDIUM Apple iOS must implement the management setting: not allow a user to remove Apple iOS configuration profiles that enforce DoD security requirements. Configuration profiles define security policies on Apple iOS devices. If a user is able to remove a configuration profile, the user can then change the configuration that had been enforced by that policy. Relaxing security policies may introduce vulnerabi
    SV-93141r1_rule AIOS-11-012500 CCI-000366 LOW Apple iOS must implement the management setting: force Apple Watch wrist detection. Because Apple Watch is a personal device, it is key that any sensitive DoD data displayed on the Apple Watch not be viewable when the watch is not in the immediate possession of the user. This control ensures the Apple Watch screen locks when the user tak
    SV-93143r1_rule AIOS-11-012700 CCI-000366 MEDIUM Apple iOS users must complete required training. The security posture on iOS devices requires the device user to configure several required policy rules on their device. User Based Enforcement (UBE) is required for these controls. In addition, if the AO has approved users' full access to the Apple App S
    SV-93145r1_rule AIOS-11-012800 CCI-000068 MEDIUM If an unmanaged third-party VPN client is installed on the iOS device, it must not be configured with a DoD network (work) VPN profile. Access to the DoD network must be limited for unmanaged apps because they are considered untrusted. SFR ID: FMT_SMF_EXT.1.1 #3
    SV-93147r1_rule AIOS-11-012900 CCI-000366 MEDIUM A managed photo app must be used to take and store work related photos. The iOS Photos app is unmanaged and may sync photo's with a device user's personal iCloud account. Therefore work related photos should not be taken via the iOS camera app or stored in the Photos app. A managed photo app should be used to take and manage
    SV-93149r1_rule AIOS-11-011400 CCI-000366 MEDIUM Apple iOS must not allow backup to remote systems (managed applications data stored in iCloud). Storing data with a non-DoD cloud provider may leave the data vulnerable to breach. Disabling non-DoD cloud services mitigates this risk. SFR ID: FMT_SMF_EXT.1.1 #45
    SV-95779r1_rule AIOS-11-015000 CCI-000366 HIGH Only authorized versions of the Apple iOS must be used. Apple iOS 11 is no longer supported by Apple and therefore, may contain security vulnerabilities. Apple iOS 11 is not authorized within the DoD six weeks after the public release of iOS 12.