Advisory Details

November 5th, 2018

Apple macOS nsurlstoraged Out-Of-Bounds Read Information Disclosure Vulnerability

CVE ID	CVE-2018-4126
CVSS SCORE	3.3, AV:L/AC:M/Au:N/C:P/I:N/A:P
AFFECTED VENDORS	Apple
AFFECTED PRODUCTS	macOS
VULNERABILITY DETAILS	This vulnerability allows local attackers to disclose sensitive information on vulnerable installations of Apple macOS. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of cookie data. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the current user.
ADDITIONAL DETAILS	Apple has issued an update to correct this vulnerability. More details can be found at: https://support.apple.com/en-us/HT209139
DISCLOSURE TIMELINE	2018-05-09 - Vulnerability reported to vendor 2018-11-05 - Coordinated public release of advisory 2018-11-05 - Advisory Updated
CREDIT	Bruno Keith (@bkth_)

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