ID CVE-2017-13872
Summary An issue was discovered in certain Apple products. macOS High Sierra before Security Update 2017-001 is affected. The issue involves the "Directory Utility" component. It allows attackers to obtain administrator access without a password via certain interactions involving entry of the root user name.
References
Vulnerable Configurations
  • Apple Mac OS X 10.13.0
    cpe:2.3:o:apple:mac_os_x:10.13.0
  • Apple Mac OS X 10.13.1
    cpe:2.3:o:apple:mac_os_x:10.13.1
CVSS
Base: 9.3
Impact:
Exploitability:
CWE CWE-287
CAPEC
  • Authentication Abuse
    An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target's authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Utilizing REST's Trust in the System Resource to Register Man in the Middle
    This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated. Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme.
  • Man in the Middle Attack
    This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.
exploit-db via4
  • description Apple macOS 10.13.1 (High Sierra) - 'Blank Root' Local Privilege Escalation. CVE-2017-13872. Local exploit for macOS platform
    file exploits/macos/local/43248.md
    id EDB-ID:43248
    last seen 2017-12-09
    modified 2017-11-28
    platform macos
    port
    published 2017-11-28
    reporter Exploit-DB
    source https://www.exploit-db.com/download/43248/
    title Apple macOS 10.13.1 (High Sierra) - 'Blank Root' Local Privilege Escalation
    type local
  • id EDB-ID:43201
metasploit via4
nessus via4
  • NASL family MacOS X Local Security Checks
    NASL id MACOS_10_13_2.NASL
    description The remote host is running a version of Mac OS X that is 10.13.x prior to 10.13.2. It is, therefore, affected by multiple vulnerabilities in the following components : - apache - curl - Directory Utility - IOAcceleratorFamily - IOKit - Intel Graphics Driver - Kernel - Mail - Mail Drafts - OpenSSL - Screen Sharing Server Note that successful exploitation of the most serious issues can result in arbitrary code execution.
    last seen 2019-01-16
    modified 2018-07-14
    plugin id 105080
    published 2017-12-07
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=105080
    title macOS 10.13.x < 10.13.2 Multiple Vulnerabilities (Meltdown)
  • NASL family MacOS X Local Security Checks
    NASL id MACOSX_HIGH_SIERRA_EMPTY_ROOT_PASSWORD.NASL
    description The remote host is running a version of MacOS 10.13 or 10.13.1 that is missing a security update. It is, therefore, affected by a root authentication bypass vulnerability. A local attacker or a remote attacker with credentials for a standard user account has the ability to blank out the root account password. This can allow an attacker to escalate privileges to root and execute commands and read files as a system administrator.
    last seen 2019-01-16
    modified 2018-07-14
    plugin id 104814
    published 2017-11-28
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=104814
    title MacOS 10.13 root Authentication Bypass (Security Update 2017-001)
  • NASL family Misc.
    NASL id MACOS_10_13_AUTH_BYPASS_REMOTE_CHECK.NASL
    description The remote host is affected by an authentication bypass vulnerability. A local attacker or a remote attacker with credentials for a standard user account has the ability to blank out the root account password. This can allow an authenticated attacker to escalate privileges to root and execute commands and read files as a system administrator. A remote attacker without credentials can set passwords on certain disabled accounts. Note that if this plugin is successful, Nessus has set the password on the 'nobody' account to 'nessus', and you will need to reset this password/re-disable this account to clean up.
    last seen 2019-02-15
    modified 2019-02-14
    plugin id 105003
    published 2017-12-04
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=105003
    title macOS 10.13 Authentication Bypass Remote Check (CVE-2017-13872)
  • NASL family MacOS X Local Security Checks
    NASL id MACOS_10_13_ROOT_AUTH_BYPASS_DIRECT_CHECK.NASL
    description The remote host is running a version of macOS that has a root authentication bypass vulnerability. A local attacker or a remote attacker with credentials for a standard user account has the ability to blank out the root account password. This can allow an attacker to escalate privileges to root and execute commands and read files as a system administrator.
    last seen 2019-01-16
    modified 2018-08-10
    plugin id 104848
    published 2017-11-29
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=104848
    title macOS 10.13 root Authentication Bypass Direct Check
refmap via4
bid 101981
confirm https://support.apple.com/HT208331
misc
sectrack 1039875
Last major update 29-11-2017 - 12:29
Published 29-11-2017 - 12:29
Last modified 29-12-2017 - 21:29
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