SB2020082520 - Multiple vulnerabilities in Mozilla Firefox and Firefox ESR

Description

This security bulletin contains information about 11 secuirty vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-15663)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due Mozilla Maintenance Service does not check if the updater.exe file has a valid signature before executing it with elevated privileges. A local user with ability to replace the updater.exe file file can execute arbitrary code with SYSTEM privileges.

2) Resource management error (CVE-ID: CVE-2020-15664)

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to the way Firefox handles prompts. By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension. Combined with user confusion, this could result in an unintended or malicious extension being installed.

3) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2020-12401)

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to usage of ECDSA signatures. A local user can perform a side channel attack and gain access to sensitive information.

4) Cryptographic issues (CVE-ID: CVE-2020-6829)

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

The vulnerability exists due to usage of wNAF point multiplication algorithm when performing EC scalar point multiplication, which leaked partial information about the nonce used during signature generation. A remote attacker can perform an electro-magnetic side-channel attack and recover the private key.

5) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2020-12400)

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists in Mozilla NSS library in the way P-384 and P-521 curves are used in the generation of EDSA signatures, leaking partial information about the ECDSA nonce. Given a small number of ECDSA signatures, this information can be used to steal the private key.

6) Spoofing attack (CVE-ID: CVE-2020-15665)

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to Firefox does not reset the address bar after the beforeunload dialog is  shown if the user chooses to remain on the page. As a result, an incorrect URL is shown in the address bar.

7) Information disclosure (CVE-ID: CVE-2020-15666)

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

The vulnerability exists due to excessive data output in an MediaError message. When trying to load a non-video in an audio/video context the exact status code (200, 302, 404, 500, 412, 403, etc.) was disclosed via the MediaError Message. This level of information leakage is inconsistent with the standardized onerror/onsuccess disclosure and can lead to inferring login status to services or device discovery on a local network among other attacks.

8) Heap-based buffer overflow (CVE-ID: CVE-2020-15667)

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

The vulnerability exists due to a boundary error when processing a MAR update file, after the signature has been validated. A remote attacker can pass specially crafted data to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires that the malicious file is signed with a valid Mozilla-controlled signing key.

9) Race condition (CVE-ID: CVE-2020-15668)

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

The vulnerability exists due to a race condition when reading certification information during certificate import. A remote attacker can exploit the race and gain gain access to potentially sensitive data.

10) Buffer overflow (CVE-ID: CVE-2020-15670)

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.

11) Use-after-free (CVE-ID: CVE-2020-15669)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when aborting operations in browser. 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 system.

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

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-38/
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-37/
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-36/
• https://security.gentoo.org/glsa/202008-08
• https://access.redhat.com/security/cve/cve-2020-12401
• https://access.redhat.com/security/cve/cve-2020-12400