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Last year, the Firefox platform development team announced plans to remove the built-in FTP implementation from the browser. FTP is a protocol for transferring files from one host to another.

The implementation is currently disabled in the Firefox Nightly and Beta pre-release channels and will be disabled when Firefox 88 is released on April 19, 2021. The implementation will be removed in Firefox 90. After FTP is disabled in Firefox, the browser will delegate ftp:// links to external applications in the same manner as other protocol handlers.

With the deprecation, browserSettings.ftpProtocolEnabled will become read-only. Attempts to set this value will have no effect.

Most places where an extension may pass “ftp” such as filters for proxy or webRequest should not result in an error, but the APIs will no longer handle requests of those types.

To help offset this removal, ftp has been added to the list of supported protocol_handlers for browser extensions. This means that extensions will be able to prompt users to launch a FTP application to handle certain links.

Please let us if you have any questions on our developer community forum.

Security Vulnerabilities fixed in Firefox 88

• Firefox 88

#CVE-2021-23994: Out of bound write due to lazy initialization

Reporter

Abraruddin Khan and Omair

Impact

high

Description

A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound write.

References

#CVE-2021-23995: Use-after-free in Responsive Design Mode

Reporter

Irvan Kurniawan

Impact

high

Description

When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code.

References

#CVE-2021-23996: Content rendered outside of webpage viewport

Reporter

Colin D. Munro

Impact

high

Description

By utilizing 3D CSS in conjunction with Javascript, content could have been rendered outside the webpage's viewport, resulting in a spoofing attack that could have been used for phishing or other attacks on a user.

References

#CVE-2021-23997: Use-after-free when freeing fonts from cache

Firefox 2021 Review

Reporter

Irvan Kurniawan

Impact

high

Description

Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the font cache. We presume that with enough effort this could have been exploited to run arbitrary code.

References

#CVE-2021-23998: Secure Lock icon could have been spoofed

Reporter

Jordi Chancel

Impact

moderate

Description

Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon from an HTTPS page.

References

#CVE-2021-23999: Blob URLs may have been granted additional privileges

Reporter

Nika Layzell

Impact

moderate

Description

If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content.

References

#CVE-2021-24000: requestPointerLock() could be applied to a tab different from the visible tab

Firefox 2021 Review

Reporter

Irvan Kurniawan

Impact

moderate

Description

A race condition with requestPointerLock() and setTimeout() could have resulted in a user interacting with one tab when they believed they were on a separate tab. In conjunction with certain elements (such as <input type='file'>) this could have led to an attack where a user was confused about the origin of the webpage and potentially disclosed information they did not intend to.

References

#CVE-2021-24001: Testing code could have enabled session history manipulations by a compromised content process

Reporter

Andrew McCreight

Impact

moderate

Description

Mozilla Firefox Download

A compromised content process could have performed session history manipulations it should not have been able to due to testing infrastructure that was not restricted to testing-only configurations.

References

#CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL

Reporter

Daniel Santos

Impact

moderate

Description

When a user clicked on an FTP URL containing encoded newline characters (%0A and %0D), the newlines would have been interpreted as such and allowed arbitrary commands to be sent to the FTP server.

References

#CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads

Reporter

Christian Holler

Impact

moderate

Description

The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash.
Note: This issue only affected x86-32 platforms. Other platforms are unaffected.

References

#CVE-2021-29944: HTML injection vulnerability in Firefox for Android's Reader View

Reporter

Wladimir Palant working with Include Security

Impact

low

Description

Lack of escaping allowed HTML injection when a webpage was viewed in Reader View. While a Content Security Policy prevents direct code execution, HTML injection is still possible.
Note: This issue only affected Firefox for Android. Other operating systems are unaffected.

References

Firefox 2021 Logo

#CVE-2021-29946: Port blocking could be bypassed

Reporter

Frederik Braun

Impact

low

Description

Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header.

References

#CVE-2021-29947: Memory safety bugs fixed in Firefox 88

Reporter

Mozilla developers and community

Impact

high

Description

Mozilla developers and community members Ryan VanderMeulen, Sean Feng, Tyson Smith, Julian Seward, Christian Holler reported memory safety bugs present in Firefox 87. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

Firefox 2021 Models

References