Advisory Details

August 13th, 2015

Apple OS X iCloud Account Authentication Elevation Of Privilege Vulnerability

ZDI-15-390
ZDI-CAN-2996

CVE ID CVE-2015-3799
CVSS SCORE 7.2, AV:L/AC:L/Au:N/C:C/I:C/A:C
AFFECTED VENDORS Apple
AFFECTED PRODUCTS OS X
VULNERABILITY DETAILS


This vulnerability allows attackers to execute arbitrary code on vulnerable installations of Apple OS X. An attacker must have shell access to exploit this vulnerability, however Guest access is sufficient.

The specific flaw exists within the authentication of users who use their iCloud account and password to log in to OS X. Any user is able to change the password of these users without knowing the previous password. This allows an attacker to run arbitrary commands as that user. If the target user is an Admin, the attacker can run arbitrary commands as root.
ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT201222
DISCLOSURE TIMELINE
  • 2015-06-10 - Vulnerability reported to vendor
  • 2015-08-13 - Coordinated public release of advisory
CREDIT Anonymous
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