Information disclosure in Mozilla Firefox for iOS

1) Information disclosure

EUVDB-ID: #VU28368

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-12404

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

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

The vulnerability exists due in native-to-JS bridging implementation that requires a unique token to be passed that ensures non-app code can't call the bridging functions. A remote attacker can create a specially crafted web page, trick the victim into downloading files and obtain token. This token can be used for further attacks against the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Firefox for iOS: 8.0 - 25.0

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-19/

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 perform certain actions on the device.

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.