Multiple vulnerabilities in Mozilla Firefox
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 6 |
| CVE-ID | CVE-2021-38495 CVE-2021-38494 CVE-2021-38493 CVE-2021-38492 CVE-2021-38491 CVE-2021-29993 |
| CWE-ID | CWE-119 CWE-20 CWE-264 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Firefox ESR Client/Desktop applications / Web browsers Mozilla Firefox Client/Desktop applications / Web browsers Firefox for Android Mobile applications / Apps for mobile phones |
| Vendor | Mozilla |
Security Bulletin
This security bulletin contains information about 6 vulnerabilities.
1) Buffer overflow
EUVDB-ID: #VU56376
Risk: High
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-38495
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
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 versionsFirefox ESR: 91.0 - 91.0.1
CPE2.3 External linkshttp://www.mozilla.org/en-US/security/advisories/mfsa2021-40/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Buffer overflow
EUVDB-ID: #VU56375
Risk: High
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-38494
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
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 - 91.0.2
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:91.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0:*:*:*:*:*:*:*
http://www.mozilla.org/en-US/security/advisories/mfsa2021-38/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Buffer overflow
EUVDB-ID: #VU56374
Risk: High
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-38493
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
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: 70.0 - 91.0.2
Firefox ESR: 60.0 - 78.13.0
CPE2.3- cpe:2.3:a:mozilla:firefox_esr:78.13.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:68.12.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:60.9.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0:*:*:*:*:*:*:*
http://www.mozilla.org/en-US/security/advisories/mfsa2021-38/
http://www.mozilla.org/en-US/security/advisories/mfsa2021-39/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Input validation error
EUVDB-ID: #VU56373
Risk: Medium
CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-38492
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient validation of user-supplied input when delegating navigations to the operating system. Firefox accept the mk scheme, which allows a remote attacker to launch pages and execute scripts in Internet Explorer in unprivileged mode.
Install updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 60.0 - 91.0.2
Firefox ESR: 60.0 - 91.0.1
CPE2.3- cpe:2.3:a:mozilla:firefox_esr:91.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:78.13.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:68.12.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:60.9.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0:*:*:*:*:*:*:*
http://www.mozilla.org/en-US/security/advisories/mfsa2021-38/
http://www.mozilla.org/en-US/security/advisories/mfsa2021-39/
http://www.mozilla.org/en-US/security/advisories/mfsa2021-40/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
5) Security restrictions bypass
EUVDB-ID: #VU56372
Risk: Low
CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-38491
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to Mixed-Content-Blocking was unable to check opaque origins. As a result, the mixed-content checks were unable to analyze opaque origins which led to some mixed content being loaded.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMozilla Firefox: 80.0 - 91.0.2
CPE2.3- cpe:2.3:a:mozilla:mozilla_firefox:91.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:mozilla_firefox:91.0:*:*:*:*:*:*:*
http://www.mozilla.org/en-US/security/advisories/mfsa2021-38/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to visit a specially crafted website.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
6) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU56371
Risk: Medium
CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-29993
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
Description
The vulnerability allows a remote attacker to perform denial of service or spoofing attack.
The vulnerability exists due to Firefox allows navigation through the intent:// protocol. A remote attacker can trick the victim to follow a specially crafted link and perform a denial of service attack or spoof the UI.
Install updates from vendor's website.
Vulnerable software versionsFirefox for Android: 66.0.4 - 91.4.0
CPE2.3- cpe:2.3:a:mozilla:firefox_for_android:91.4.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_for_android:91.3.1:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_for_android:91.3.0:*:*:*:*:*:*:*
http://www.mozilla.org/en-US/security/advisories/mfsa2021-38/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to perform certain actions on the device.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
