SB2021122008 - Multiple vulnerabilities in WebKitGTK and WPE WebKit

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Type Confusion (CVE-ID: CVE-2021-30818)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error in WebKit. A remote attacker can trick the victim to visit a specially crafted website, trigger a type confusion error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Man-in-the-Middle (MitM) attack (CVE-ID: CVE-2021-30823)

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists in WebKit. A remote attacker can bypass HSTS and perform MitM attack.

3) Information disclosure (CVE-ID: CVE-2021-30884)

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

The vulnerability exists in the WebKit component when processing CSS files. A remote attacker can trick the victim to open a specially crafted website and obtain user's browsing history.

4) 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.

5) 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.

6) Information disclosure (CVE-ID: CVE-2021-30897)

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

The vulnerability exists in the WebKit specification for the resource timing API. A remote attacker can exfiltrate cross-origin data, if the victim visits a specially crafted website.

Remediation

Install update from vendor's website.

References

• https://webkitgtk.org/security/WSA-2021-0007.html