firefox-78.5.0esr

[ken@…]

New version now available, as expected. Release notes should appear tomorrow. Works fine, but at this point I am uncertain if any of hte changes include security fixes.

[ken@…]

Updated at r23907, waiting for Release Notes

[ken@…]

​https://www.mozilla.org/en-US/firefox/78.5.0/releasenotes/ and more particularly ​https://www.mozilla.org/en-US/security/advisories/mfsa2020-51/

#CVE-2020-26951: Parsing mismatches could confuse and bypass security sanitizer for chrome privileged code

Reporter

Irvan Kurniawan (@sourc7)

Impact

high

Description

A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. References

Bug 1667113

#CVE-2020-16012: Variable time processing of cross-origin images during drawImage calls

Reporter

Aleksejs Popovs

Impact

moderate

Description

When drawing a transparent image on top of an unknown cross-origin image, the Skia library drawImage function took a variable amount of time depending on the content of the underlying image. This resulted in potential cross-origin information exposure of image content through timing side-channel attacks. References

Bug 1642028

#CVE-2020-26953: Fullscreen could be enabled without displaying the security UI

Reporter

Abdulrahman Alqabandi of Microsoft Browser Vulnerability Research

Impact

moderate

Description

It was possible to cause the browser to enter fullscreen mode without displaying the security UI; thus making it possible to attempt a phishing attack or otherwise confuse the user. References

Bug 1656741

#CVE-2020-26956: XSS through paste (manual and clipboard API)

Reporter

Irvan Kurniawan (@sourc7)

Impact

moderate

Description

In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. References

Bug 1666300

#CVE-2020-26958: Requests intercepted through ServiceWorkers lacked MIME type restrictions

Reporter

Moti Harmats

Impact

moderate

Description

Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. This could lead to a cross-site script inclusion vulnerability, or a Content Security Policy bypass. References

Bug 1669355

#CVE-2020-26959: Use-after-free in WebRequestService

Reporter

Bharadwaj Machiraju

Impact

moderate

Description

During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. References

Bug 1669466

#CVE-2020-26960: Potential use-after-free in uses of nsTArray

Reporter

Zijie Zhao

Impact

moderate

Description

If the Compact() method was called on an nsTArray, the array could have been reallocated without updating other pointers, leading to a potential use-after-free and exploitable crash. References

Bug 1670358

#CVE-2020-15999: Heap buffer overflow in freetype

Reporter

Sergei Glazunov of Google Project Zero

Impact

moderate

Description

In Freetype, if PNG images were embedded into fonts, the Load_SBit_Png function contained an integer overflow that led to a heap buffer overflow, memory corruption, and an exploitable crash. Note: While Project Zero did discover instances of this vulnerability being exploited in the wild against Chrome, in Firefox this vulnerability is only triggerable if a rarely-used, hidden preference is toggled, and only affected Linux and Android operating systems. Other operating systems are unaffected; and Linux and Android are unaffected in the default configuration. References

Bug 1672223

#CVE-2020-26961: DoH did not filter IPv4 mapped IP Addresses

Reporter

Gabriel Corona

Impact

moderate

Description

When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding attack. References

Bug 1672528

#CVE-2020-26965: Software keyboards may have remembered typed passwords

Reporter

Makoto Kato

Impact

low

Description

Some websites have a feature "Show Password" where clicking a button will change a password field into a textbook field, revealing the typed password. If, when using a software keyboard that remembers user input, a user typed their password and used that feature, the type of the password field was changed, resulting in a keyboard layout change and the possibility for the software keyboard to remember the typed password. References

Bug 1661617

#CVE-2020-26966: Single-word search queries were also broadcast to local network

Reporter

tiebuchen

Impact

low

Description

Searching for a single word from the address bar caused an mDNS request to be sent on the local network searching for a hostname consisting of that string; resulting in an information leak. Note: This issue only affected Windows operating systems. Other operating systems are unaffected. References

Bug 1663571

#CVE-2020-26968: Memory safety bugs fixed in Firefox 83 and Firefox ESR 78.5

Reporter

Mozilla developers and community

Impact

high

Description

Mozilla developers Steve Fink, Jason Kratzer, Randell Jesup, Christian Holler, and Byron Campen reported memory safety bugs present in Firefox 82 and Firefox ESR 78.4. 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. References

Memory safety bugs fixed in Firefox 83 and Firefox ESR 78.5