#VU26450 Improper access control in Apple iOS and iPadOS - CVE-2020-3890

Vulnerability identifier: #VU26450

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-3890

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apple iOS
Operating systems & Components / Operating system
iPadOS
Operating systems & Components / Operating system

Vendor: Apple Inc.

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in deletion messages. A remote attacker can cause the deleted messages groups may still be suggested as an autocompletion.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apple iOS: 13.0 17A577, 13.1.1 17A854 - 13.1.3 17A878, 13.2.2 17B102 - 13.2.3 17B111, 13.3 17C54 - 13.3.1 17D50

iPadOS: 13.1.1 - 13.1.3, 13.2 - 13.2.3, 13.3 - 13.3.1

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External links
https://seclists.org/fulldisclosure/2020/Mar/28
https://support.apple.com/en-hk/HT211102

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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.