SB2020092302 - Multiple vulnerabilities in Mozilla Firefox and Firefox ESR

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2020-15675)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing HTML content in WebGL. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a use-after free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

2) Spoofing attack (CVE-ID: CVE-2020-15677)

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to way Firefox displays name of the data origin when downloading files. A remote attacker can spoof origin of the downloaded file and display the name of the intermediate website instead of the original source name.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack but requires that the spoofed website has an open redirect vulnerability.

3) Cross-site scripting (CVE-ID: CVE-2020-15676)

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

The vulnerability exists due to Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element.

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.

4) Use-after-free (CVE-ID: CVE-2020-15678)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing HTML content. When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free. This occurs because the function APZCTreeManager::ComputeClippedCompositionBounds did not follow iterator invalidation rules.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

5) Buffer overflow (CVE-ID: CVE-2020-15673)

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. A remote attacker can create a specially crafted web page, 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) Buffer overflow (CVE-ID: CVE-2020-15674)

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. A remote attacker can create a specially crafted web page, 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.

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-42/
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-43/