Multiple Vulnerabilities in iCloud for Windows Could Allow for Arbitrary Code Execution

DESCRIPTION:
Multiple vulnerabilities have been discovered in iCloud for Windows
Could Allow for Arbitrary Code Execution. iCloud for Windows is a cloud
storage and cloud computing service. Successful exploitation of these
vulnerabilities could result in arbitrary code execution within the
context of the application, an attacker gaining the same privileges as
the logged-on user, or the bypassing of security restrictions. Depending
on the permission associated with the application running the exploit,
an attacker could then install programs; view, change, or delete data.

IMPACT:
Multiple Vulnerabilities have been discovered in iCloud for Windows
which could allow for arbitrary code execution in the context of the
affected user. Details of these vulnerabilities are as follows:

* A type confusion issue was addressed with improved memory handling,
which could allow for arbitrary code execution. (CVE-2021-30852)
* A memory corruption issue was addressed with improved input
validation, which could allow for arbitrary code execution. (CVE-2021-30814)
* Processing a maliciously crafted image could allow for arbitrary code
execution. (CVE-2021-30835, CVE-2021-30847)
* An attacker in a privileged network position may be able to bypass
HSTS. (CVE-2021-30823)
* Multiple memory corruption issues, which could allow for arbitrary
code execution. (CVE-2021-30849)

Successful exploitation of these vulnerabilities could result in
arbitrary code execution within the context of the application, an
attacker gaining the same privileges as the logged-on user, or the
bypassing of security restrictions. Depending on the permission
associated with the application running the exploit, an attacker could
then install programs; view, change, or delete data.

SYSTEM AFFECTED:
* iCloud for Windows versions prior to 13

RECOMMENDATIONS:
We recommend the following actions be taken:

* Apply appropriate patches provided by Apple to vulnerable systems
immediately after appropriate testing.
* Run all software as a nonprivileged user (one without administrative
privileges) to diminish the effects of a successful attack.
* Remind users not to download, accept or execute files from untrusted
and unknown sources.
* Remind users not to visit untrusted websites or follow links provided
by untrusted or unknown sources.
* Evaluate read, write, and execute permissions on all newly installed
software.
* Apply the Principle of Least Privilege to all systems and services.

REFERENCES:
https://support.apple.com/en-us/HT201222
https://support.apple.com/en-us/HT212953

Published: 26 December 2021, 16:33:22 BST