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CVE-2020-26965

Mozilla: Software keyboards may have remembered typed passwords

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. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS 3.1 · 6.5 Medium EPSS 1.3% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 3 more
CVE-2020-26961

Mozilla: DoH did not filter IPv4 mapped IP Addresses

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. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS 3.1 · 6.5 Medium EPSS 1.2% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 3 more
CVE-2020-26960

Mozilla: Potential use-after-free in uses of nsTArray

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. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS 3.1 · 8.8 High EPSS 1.6% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 3 more
CVE-2020-26959

Mozilla: Use-after-free in WebRequestService

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. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS 3.1 · 8.8 High EPSS 1.3% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 3 more
CVE-2020-26958

Mozilla: Requests intercepted through ServiceWorkers lacked MIME type restrictions

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. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS 3.1 · 6.1 Medium EPSS 1.4% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 3 more
CVE-2020-26956

Mozilla: XSS through paste (manual and clipboard API)

In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS 3.1 · 6.1 Medium EPSS 1.2% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 3 more
CVE-2020-26953

Mozilla: Fullscreen could be enabled without displaying the security UI

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. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS 3.1 · 4.3 Medium EPSS 1.3% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 3 more
CVE-2020-26951

Mozilla: Parsing mismatches could confuse and bypass security sanitizer for chrome privileged code

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. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS 3.1 · 6.1 Medium EPSS 1.1% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 3 more
CVE-2020-26950

Mozilla: Write side effects in MCallGetProperty opcode not accounted for

In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.

CVSS 3.1 · 8.8 High EPSS 42.3% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 3 more
CVE-2020-15683

Mozilla: Memory safety bugs fixed in Firefox 82 and Firefox ESR 78.4

Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. 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. This vulnerability affects Firefox ESR < 78.4, Firefox < 82, and Thunderbird < 78.4.

CVSS 3.1 · 9.8 Critical EPSS 2.7% KEV · Not listed
Vendors
Debian Mozilla Opensuse and 1 more
Products
Debian Linux Firefox Firefox Esr and 5 more
CVE-2020-15678

Mozilla: When recursing through layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free scenario

When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free. This occurs because the function APZCTreeManager::ComputeClippedCompositionBounds did not follow iterator invalidation rules. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.

CVSS 3.1 · 8.8 High EPSS 1.9% KEV · Not listed
Vendors
Debian Mozilla Opensuse and 1 more
Products
Debian Linux Firefox Firefox Esr and 5 more
CVE-2020-15677

Mozilla: Download origin spoofing via redirect

By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.

CVSS 3.1 · 6.1 Medium EPSS 1.7% KEV · Not listed
Vendors
Debian Mozilla Opensuse and 1 more
Products
Debian Linux Firefox Firefox Esr and 5 more
CVE-2020-15676

Mozilla: XSS when pasting attacker-controlled data into a contenteditable element

Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.

CVSS 3.1 · 6.1 Medium EPSS 1.6% KEV · Not listed
Vendors
Debian Mozilla Opensuse and 1 more
Products
Debian Linux Firefox Firefox Esr and 5 more
CVE-2020-15673

Mozilla: Memory safety bugs fixed in Firefox 81 and Firefox ESR 78.3

Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. 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. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.

CVSS 3.1 · 8.8 High EPSS 2.0% KEV · Not listed
Vendors
Debian Mozilla Opensuse and 1 more
Products
Debian Linux Firefox Firefox Esr and 5 more
CVE-2020-15669

Mozilla: Use-After-Free when aborting an operation

When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified. This results in a use-after-free and we presume that with enough effort it could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.12 and Thunderbird < 68.12.

CVSS 3.1 · 8.8 High EPSS 1.1% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Esr Thunderbird Enterprise Linux and 2 more
CVE-2020-15663

Mozilla: Downgrade attack on the Mozilla Maintenance Service could have resulted in escalation of privilege

If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous version which would have allowed exploitation of an older bug and arbitrary code execution with System Privileges. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, and Firefox ESR < 78.2.

CVSS 3.1 · 8.8 High EPSS 2.7% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2020-15659

Mozilla: Memory safety bugs fixed in Firefox 79 and Firefox ESR 68.11

Mozilla developers and community members reported memory safety bugs present in Firefox 78 and Firefox ESR 78.0. 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. This vulnerability affects Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.

CVSS 3.1 · 8.8 High EPSS 2.4% KEV · Not listed
Vendors
Canonical Mozilla Opensuse and 1 more
Products
Ubuntu Linux Firefox Firefox Esr and 5 more
CVE-2020-15658

Mozilla: Overriding file type when saving to disk

The code for downloading files did not properly take care of special characters, which led to an attacker being able to cut off the file ending at an earlier position, leading to a different file type being downloaded than shown in the dialog. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

CVSS 3.1 · 6.5 Medium EPSS 1.4% KEV · Not listed
Vendors
Canonical Mozilla Redhat
Products
Ubuntu Linux Firefox Firefox Esr and 4 more
CVE-2020-15657

Mozilla: DLL hijacking due to incorrect loading path

Firefox could be made to load attacker-supplied DLL files from the installation directory. This required an attacker that is already capable of placing files in the installation directory. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Microsoft Mozilla
Products
Windows Firefox Firefox Esr and 1 more
CVE-2020-15656

Mozilla: Type confusion for special arguments in IonMonkey

JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

CVSS 3.1 · 8.8 High EPSS 1.5% KEV · Not listed
Vendors
Canonical Mozilla Opensuse and 1 more
Products
Ubuntu Linux Firefox Firefox Esr and 5 more