SB2024022306 - Two universal XSS vulnerabilities in Mozilla Focus for iOS

Description

This security bulletin contains information about 2 vulnerabilities.

1) Universal cross-site scripting (CVE-ID: CVE-2024-26284)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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

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 when processing HTTP 302 redirects. 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 vulnerable 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.

2) Universal cross-site scripting (CVE-ID: CVE-2024-1563)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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

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. A remote attacker can trick the victim to follow a specially crafted link and execute unauthorized scripts on top origin sites using a JavaScript URI when opening an external URL with a custom Firefox scheme and a timeout race condition.

Remediation

Install update from vendor's website.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1860075
• https://www.mozilla.org/security/advisories/mfsa2024-10/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1863831
• https://www.mozilla.org/security/advisories/mfsa2024-09/