Information disclosure in Firefox for iOS

1) Information disclosure

EUVDB-ID: #VU27481

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-6830

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

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

For native-to-JS bridging, the app requires a unique token to be passed that ensures non-app code can't call the bridging functions. That token was being used for JS-to-native also, but it isn't needed in this case, and its usage was also leaking this token.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Firefox for iOS: 8.0 - 24.0

CPE2.3

• cpe:2.3:a:mozilla:firefox_for_ios:8.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox_for_ios:9.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox_for_ios:10.0:*:*:*:*:*:*:*

External links

https://www.mozilla.org/en-US/security/advisories/mfsa2020-15/

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.