SB2020040748 - Ubuntu update for Firefox

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2020-6821)

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

The vulnerability exists due to a boundary condition when using WebGL copyTexSubImage method. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger out-of-bounds read error and read contents of uninitialized memory on the system.

2) Out-of-bounds write (CVE-ID: CVE-2020-6822)

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

The vulnerability exists due to a boundary condition in GMPDecodeData when processing images larger than 4Gb on 32-bit builds. A remote attacker can create a specially crafted image, trick the victim into opening it, trigger out-of-bounds write and execute arbitrary code on the target system.

3) Weak password requirements (CVE-ID: CVE-2020-6824)

The vulnerability allows a local user to gain access to another user password.

The vulnerability exists due to incorrect behavior of password generator when private browsing mode is user. If the victim had used password generator in a Private Browsing Window to generate a password and then closed the private window while leaving Firefox open, the attacker can open another private browsing session, visit the same website and Firefox will generate identical password.

4) Buffer overflow (CVE-ID: CVE-2020-6825)

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 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.

5) Buffer overflow (CVE-ID: CVE-2020-6826)

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 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) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-6823)

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

The vulnerability exists due to incorrect processing of extension permissions. A malicious extension could have called browser.identity.launchWebAuthFlow, controlling the redirect_uri, and through the Promise returned, obtain the Auth code and gain access to the user's account at the service provider.

Remediation

Install update from vendor's website.

References

• https://usn.ubuntu.com/4323-1/