Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 17 |
| CVE-ID | CVE-2020-26951 CVE-2020-26952 CVE-2020-26959 CVE-2020-26958 CVE-2020-26956 CVE-2020-26953 CVE-2020-16012 CVE-2020-26960 CVE-2020-26961 CVE-2020-26962 CVE-2020-26963 CVE-2020-26965 CVE-2020-26966 CVE-2020-26967 CVE-2020-26968 CVE-2020-26969 CVE-2020-15999 |
| CWE-ID | CWE-20 CWE-119 CWE-416 CWE-264 CWE-79 CWE-346 CWE-358 CWE-435 CWE-399 CWE-200 CWE-122 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #7 is available. Vulnerability #17 is being exploited in the wild. |
| Vulnerable software Subscribe |
Mozilla Firefox Client/Desktop applications / Web browsers Firefox ESR Client/Desktop applications / Web browsers |
| Vendor | Mozilla |
Security Bulletin
This security bulletin contains information about 17 vulnerabilities.
1) Input validation error
EUVDB-ID: #VU48458
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2020-26951
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient validation of user-supplied input. 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 the built-in sanitizer.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
2) Buffer overflow
EUVDB-ID: #VU48459
Risk: High
CVSSv3.1:
CVE-ID: CVE-2020-26952
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. The incorrect bookkeeping of functions inlined during JIT compilation when handling out-of-memory errors can trigger memory corruption and allow remote code execution.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 82.0.3
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
3) Use-after-free
EUVDB-ID: #VU48464
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2020-26959
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error within the WebRequestService component during browser shutdown. A remote attacker can create a specially crafted web page, trick the victim into visiting it, force the victim to shutdown the browser, trigger a use-after-free error and execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
4) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU48463
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2020-26958
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due Firefox does not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. A remote attacker can exploit this behavior to perform a cross-site script inclusion vulnerability or bypass implemented Content Security Policy restrictions.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
5) Universal cross-site scripting
EUVDB-ID: #VU48462
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2020-26956
CWE-ID:
Exploit availability:
DescriptionThe disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data. In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
6) Insufficient UI Warning of Dangerous Operations
EUVDB-ID: #VU48461
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2020-26953
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to the way under certain conditions Firefox enters the fullscreen mode without displaying UI notification. A remote attacker can perform a phishing attack.
Install updates from vendor's website.
Vulnerable software versionsFirefox ESR: 60.0 - 78.4.1
Mozilla Firefox: 60.0 - 82.0.3
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
7) Origin validation error
EUVDB-ID: #VU48460
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2020-16012
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to the way browser handles requests to cross-origin images. When drawing a transparent image on top of an unknown cross-origin image, the Skia library drawImage
function takes a variable amount of time depending on the content of the
underlying image. This results in cross-origin information
exposure of image content through timing side-channel attacks.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
8) Use-after-free
EUVDB-ID: #VU48465
Risk: High
CVSSv3.1:
CVE-ID: CVE-2020-26960
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error within nsTArray implementation. If the Compact() method was called on an nsTArray, the array could have been reallocated without updating other pointers. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a use-after-free error and execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
9) Improperly implemented security check for standard
EUVDB-ID: #VU48466
Risk: Medium
CVSSv3.1:
CVE-ID: CVE-2020-26961
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to perform a DNS rebinding attack.
The vulnerability exists due to the way Firefox filters 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
10) Improper Interaction Between Multiple Correctly-Behaving Entities
EUVDB-ID: #VU48467
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2020-26962
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists in the way cross-origin iframes supported login autofill is being performed. Cross-origin iframes that contained a login form could have been recognized by the login autofill service and populated. This could have been used in clickjacking attacks, as well as be read across partitions in dynamic first party isolation.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 82.0.3
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
11) Resource management error
EUVDB-ID: #VU48468
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2020-26963
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper management of internal resources. Repeated calls to the history and location interfaces could have been
used to hang the browser.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 82.0.3
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
12) Information disclosure
EUVDB-ID: #VU48469
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2020-26965
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to the way software keyboards are handled by the Firefox. 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.
A local user leverage this behavior to gain access to passwords, stored by software keyboards.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
13) Information disclosure
EUVDB-ID: #VU48470
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2020-26966
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the way Firefox performs searches of single-word queries. Searching for a single word from the address bar cause an mDNS request to be sent on the local network searching for a hostname consisting of that string. A remote attacker with the local network can intercept the DNS query and obtain information, searched via browser address bar.
Note, the vulnerability affects Windows users only.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
14) Resource management error
EUVDB-ID: #VU48471
Risk: Low
CVSSv3.1:
CVE-ID: CVE-2020-26967
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to introduce an unexpected behavior.
The vulnerability exists due to improper management of internal resources within Mutation Observers. When listening for page changes with a Mutation Observer, a malicious web page could confuse Firefox Screenshots into interacting with elements other than those that it injected into the page. This would lead to internal errors and unexpected behavior in the Screenshots code.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 82.0.3
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
15) Buffer overflow
EUVDB-ID: #VU48472
Risk: High
CVSSv3.1:
CVE-ID: CVE-2020-26968
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 82.0.3
Firefox ESR: 60.0 - 78.4.1
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
16) Buffer overflow
EUVDB-ID: #VU48473
Risk: High
CVSSv3.1:
CVE-ID: CVE-2020-26969
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 82.0.3
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
17) Heap-based buffer overflow
EUVDB-ID: #VU47741
Risk: Critical
CVSSv3.1:
CVE-ID: CVE-2020-15999
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in freetype library when processing TTF files. A remote attacker can pass specially crafted TTF file with PNG sbit glyphs to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Note, this vulnerability is being actively exploited in the wild.
Install updates from vendor's website.
Firefox ESR: 60.0 - 78.4.1
Mozilla Firefox: 60.0 - 82.0.3
Fixed software versionsCPE2.3 External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
