CVE-2020-27779

grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled

A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Fedoraproject Gnu Netapp and 1 more

Products

Fedora Grub2 Ontap Select Deploy Administration Utility and 9 more

CVE-2020-27749

grub2: Stack buffer overflow in grub_parser_split_cmdline()

A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed

Vendors

Fedoraproject Gnu Netapp and 1 more

Products

Fedora Grub2 Ontap Select Deploy Administration Utility and 9 more

CVE-2020-26978

Mozilla: Internal network hosts could have been probed by a malicious webpage

Using techniques that built on the slipstream research, a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

CVSS 3.1 · 6.1 Medium EPSS 1.3% KEV · Not listed

Vendors

Mozilla Redhat

Products

Firefox Firefox Esr Thunderbird and 3 more

CVE-2020-26976

Mozilla: HTTPS pages could have been intercepted by a registered service worker when they should not have been

When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing. This vulnerability affects Firefox < 84.

CVSS 3.1 · 6.5 Medium EPSS 1.6% KEV · Not listed

Vendors

Debian Mozilla Redhat

Products

Debian Linux Firefox Enterprise Linux and 1 more

CVE-2020-26974

Mozilla: Incorrect cast of StyleGenericFlexBasis resulted in a heap use-after-free

When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

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

Vendors

Mozilla Redhat

Products

Firefox Firefox Esr Thunderbird and 3 more

CVE-2020-26973

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-2020-26965

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-2020-26541

kernel: security bypass in certs/blacklist.c and certs/system_keyring.c

The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. This affects certs/blacklist.c and certs/system_keyring.c.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Linux Redhat

Products

Linux Kernel Enterprise Linux Rhel Eus and 1 more

CVE-2020-26154

libproxy: sending more than 102400 bytes in PAC without a Content-Length present could result in buffer overflow

url.cpp in libproxy through 0.4.15 is prone to a buffer overflow when PAC is enabled, as demonstrated by a large PAC file that is delivered without a Content-length header.

CVSS 3.1 · 9.8 Critical EPSS 3.6% KEV · Not listed

Vendors

Debian Fedoraproject Libproxy Project and 2 more

Products

Debian Linux Fedora Libproxy and 3 more