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Group Title

PP-MDF-333040

Group ID

V-259767

Rule Version

AIOS-17-706900

Rule Title

Apple iOS/iPadOS 17 must be configured to not allow more than 10 consecutive failed authentication attempts.

Rule ID

SV-259767r943626_rule

Rule Severity

● Medium

Rule Weight

10.0

Vuln Discussion

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 less gives authorized users the ability to make a few mistakes when entering the password but still provides adequate protection against dictionary or brute force attacks on the password.

SFR ID: FMT_SMF_EXT.1.1 #2c, FIA_AFL_EXT.1.5

Documentable

False

Check Content

Review configuration settings to confirm that consecutive failed authentication attempts is set to 10 or fewer.

This procedure is performed in the Apple iOS/iPadOS management tool and on the iPhone and iPad.

Note: If an organization has multiple configuration profiles, the check procedure must be performed on the relevant configuration profiles applicable to the scope of the review.

In the Management tool, verify the "Maximum number of failed attempts" value is set to 10 or fewer.

Alternatively, verify the text "<key>maxFailedAttempts</key> <integer>10</integer>" appears in the configuration profile (.mobileconfig file). It also is acceptable for the integer value to be less than 10.

On the iPhone and iPad:

1. Open the Settings app.

2. Tap "General".

3. Tap "VPN & Device Management".

4. Tap the Configuration Profile from the iOS management tool containing the password policy.

5. Tap "Restrictions".

6. Tap "Passcode".

7. Verify "Max failed attempts" is listed as "10" or fewer.

If the "Maximum number of failed attempts" is more than 10 in the iOS management tool, "<key>maxFailedAttempts</key> " has an integer value of more than 10, or the password policy on the iPhone and iPad does not list "Max failed attempts" of 10 or fewer, this is a finding.

Check System

C-63503r943624_chk

Fix Reference

F-63410r943625_fix

Fix Text

Install a configuration profile to allow only 10 or fewer consecutive failed authentication attempts.

Identities

CCI-000044

Enforce the organization-defined limit of consecutive invalid logon attempts by a user during the organization-defined time period.

• 800-53 :: AC-7 a
• 800-53 Rev. 4 :: AC-7 a
• 800-53 Rev. 5 :: AC-7 a
• 800-53A :: AC-7.1 (ii)