SB2020073023 - Multiple vulnerabilities in Firefox for iOS

Description

This security bulletin contains information about 3 vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-15662)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to a rogue webpage could override the injected WKUserScript used by the download feature. A remote attacker can trick the browser into downloading an unintended file to the device.

2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-15661)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to a rogue webpage could override the injected WKUserScript used by the logins autofill. A remote attacker can gain access to user's passwords for the current domain.

3) Input validation error (CVE-ID: CVE-2020-15651)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient validation of filenames when downloading files, as a unicode RTL order character in the downloaded file name can be used to change the file's name during the download UI flow to change the file extension. A remote attacker can trick the victim into downloading malicious files to the system.

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-34/