Vulnerability identifier: #VU6715

Vulnerability risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-2523

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
macOS
Operating systems & Components / Operating system

Vendor: Apple Inc.

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to lack of bounds checking in [NSBuiltinCharacterSet initWithCoder:] when processing malicious data. A remote attacker can send a specially crafted graphic file, trick the victim into opening it, trigger heap-based buffer overflow in NSUnarchiver and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability may result in full system compromise.

Mitigation
Update to version 10.12.5.

Vulnerable software versions

macOS: 10.12.4 16E195, 10.10.5, 10.11.6

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External links
http://support.apple.com/en-us/HT207797

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.