#VU52628 Integer overflow in macOS - CVE-2021-1878

Vulnerability identifier: #VU52628

Vulnerability risk: Low

CVSSv4.0: 2.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2021-1878

CWE-ID: CWE-190

Exploitation vector: Local network

Exploit availability: Yes

Vulnerable software:
macOS
Operating systems & Components / Operating system

Vendor: Apple Inc.

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to integer overflow within the smbx component. A remote attacker on the local network can send specially crafted traffic to the system and gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

macOS: 10.14 18A391 - 10.15.7 19H524, 11.0 20A2411 - 11.2.3 20D91

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External links
https://support.apple.com/en-us/HT212326
https://support.apple.com/en-us/HT212325
https://support.apple.com/en-us/HT212327

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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 local network (LAN).

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.