Multiple vulnerabilities in Mozilla Firefox



Published: 2021-09-07 | Updated: 2021-09-08
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
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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:

CVE-ID: CVE-2021-38495

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Firefox ESR: 91.0 - 91.0.1


CPE2.3 External links

http://www.mozilla.org/en-US/security/advisories/mfsa2021-40/

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: #VU56375

Risk: High

CVSSv3.1:

CVE-ID: CVE-2021-38494

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 80.0 - 91.0.2


CPE2.3 External links

http://www.mozilla.org/en-US/security/advisories/mfsa2021-38/

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

3) Buffer overflow

EUVDB-ID: #VU56374

Risk: High

CVSSv3.1:

CVE-ID: CVE-2021-38493

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 70.0 - 91.0.2

Firefox ESR: 78.0 - 78.13.0, 68.0 - 68.12.0, 60.0 - 60.9.0


CPE2.3 External links

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?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

4) Input validation error

EUVDB-ID: #VU56373

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-38492

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 91.0.2

Firefox ESR: 91.0 - 91.0.1, 78.0 - 78.13.0, 68.0 - 68.12.0, 60.0 - 60.9.0


CPE2.3 External links

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?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

5) Security restrictions bypass

EUVDB-ID: #VU56372

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-38491

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 80.0 - 91.0.2


CPE2.3 External links

http://www.mozilla.org/en-US/security/advisories/mfsa2021-38/

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

6) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU56371

Risk: Medium

CVSSv3.1:

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Firefox for Android: 66.0.4 - 91.4.0


CPE2.3 External links

http://www.mozilla.org/en-US/security/advisories/mfsa2021-38/

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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