SB2021012625 - Multiple vulnerabilities in Mozilla Firefox for Android

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Security restrictions bypass (CVE-ID: CVE-2021-23957)

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

The vulnerability exists due to the way application handles navigations through the Android-specific intent URL scheme. A remote attacker can escape the iframe sandbox.

2) Cross-site scripting (CVE-ID: CVE-2021-23959)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in internal error pages. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of arbitrary website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1584582