SB2021102802 - Multiple vulnerabilities in Apple Safari
Published: October 28, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Security restrictions bypass (CVE-ID: CVE-2021-30887)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due an error within the WebKit component. A remote attacker can trick the victim to open a specially crafted website and bypass Content Security Policy restrictions.
2) Information disclosure (CVE-ID: CVE-2021-30888)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists in WebKit. A malicious website using Content Security Policy reports may be able to leak information via redirect behavior.
3) Buffer overflow (CVE-ID: CVE-2021-30889)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content in WebKit. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
4) Universal Cross-site scripting (CVE-ID: CVE-2021-30890)
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 WebKLit. 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.
Remediation
Install update from vendor's website.