Rewterz Threat Advisory – Multiple Mozilla Firefox Vulnerabilities

Severity

Medium

Analysis Summary

CVE-2021-38503

The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame.

CVE-2021-38504

When interacting with an HTML input element’s file picker dialog with webkitdirectory set, a use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash.

CVE-2021-38505

Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios. Applications that wish to prevent copied data from being recorded in Cloud History must use specific clipboard formats; and Firefox before versions 94 and ESR 91.3 did not implement them. This could have caused sensitive data to be recorded to a user’s Microsoft account.

CVE-2021-38506

Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing.

CVE-2021-38507

The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage.

MOZ-2021-0008 (CVE number not assigned yet)

A use-after-free could have occurred when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash.
CVE-2021-38508

By displaying a form validity message in the correct location at the same time as a permission prompt (such as for geolocation), the validity message could have obscured the prompt, resulting in the user potentially being tricked into granting the permission.

CVE-2021-38509

Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker’s choosing.

CVE-2021-38510

The executable file warning was not presented when downloading .inetloc files, which, due to a flaw in Mac OS, can run commands on a user’s computer.
Note: This issue only affected Mac OS operating systems. Other operating systems are unaffected.

MOZ-2021-0007 (CVE number not assigned yet)

Some of the bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Note: This issue is pending a CVE assignment and will be updated when available.

Impact

• Remote Code Execution
• Unauthorized Access
• Memory Corruption
• Spoofing
• Denial of Service
• Security Bypass
• Information Disclosure

Affected Vendors

Mozilla

Affected Products

• Mozilla Firefox ESR 91.2
• Mozilla Firefox 93

Remediation

Download the latest patches and upgrade to the latest versions of Mozilla Firefox here: