Information disclosure in Apple Safari

1) Improper Input Validation

EUVDB-ID: #VU46006

Risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:P/RL:U/RC:C]

CVE-ID: N/A

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in the Web Share API. A remote attacker can trick a victim to share a message and gain unauthorized access to sensitive information on the system, such as local files.

Note: This vulnerability affects iOS (13.4.1, 13.6), macOS Mojave 10.14.16 with Safari 13.1 (14609.1.20.111.8) and on macOS Catalina 10.15.5 with Safari 13.1.1 (15609.2.9.1.2).  

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Apple Safari: 13.1 - 13.1.1

External links

http://blog.redteam.pl/2020/08/stealing-local-files-using-safari-web.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

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.