CVE-2020-26973

Mozilla: CSS Sanitizer performed incorrect sanitization

Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

CVSS 3.1 · 8.8 High EPSS 1.6% KEV · Not listed

Vendors

Mozilla Redhat

Products

Firefox Firefox Esr Thunderbird and 3 more

CVE-2020-26971

Mozilla: Heap buffer overflow in WebGL

Certain blit values provided by the user were not properly constrained leading to a heap buffer overflow on some video drivers. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

CVSS 3.1 · 8.8 High EPSS 1.9% KEV · Not listed

Vendors

Mozilla Redhat

Products

Firefox Firefox Esr Thunderbird and 3 more

CVE-2020-26970

Mozilla: Stack overflow due to incorrect parsing of SMTP server response codes

When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird < 78.5.1.

CVSS 3.1 · 8.8 High EPSS 1.2% KEV · Not listed

Vendors

Mozilla Redhat

Products

Thunderbird Enterprise Linux Rhel E4s and 1 more

CVE-2020-26968

Mozilla: Memory safety bugs fixed in Firefox 83 and Firefox ESR 78.5

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

CVSS 3.1 · 8.8 High EPSS 1.5% KEV · Not listed

Vendors

Mozilla Redhat

Products

Firefox Firefox Esr Thunderbird and 3 more

CVE-2020-26966

Mozilla: Single-word search queries were also broadcast to local network

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

CVSS 3.1 · 6.5 Medium EPSS 1.4% KEV · Not listed

Vendors

Microsoft Mozilla

Products

Windows Firefox Firefox Esr and 1 more

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