MitM-attack in Mozilla Firefox ESR



Published: 2021-01-26
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-26976
CWE ID CWE-399
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Firefox ESR
Client/Desktop applications / Web browsers

Vendor Mozilla

Security Advisory

This security advisory describes one low risk vulnerability.

1) Resource management error

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-2020-26976

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to improper management of internal resources within the application, when processing embedded elements with https/http protocols. 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.

Mitigation

Install update from vendor's website

Vulnerable software versions

Firefox ESR: 60.0, 60.0.1, 60.0.2, 60.1.0, 60.2.0, 60.2.1, 60.2.2, 60.3.0, 60.4.0, 60.5.0, 60.5.1, 60.5.2, 60.6.0, 60.6.1, 60.6.2, 60.6.3, 60.7.0, 60.7.1, 60.7.2, 60.8.0, 60.9.0, 68.0, 68.0.1, 68.0.2, 68.1.0, 68.2.0, 68.3.0, 68.4.0, 68.4.1, 68.4.2, 68.5.0, 68.6.0, 68.6.1, 68.7.0, 68.8.0, 68.9.0, 68.10.0, 68.11.0, 68.12.0, 78.0, 78.0.1, 78.0.2, 78.1.0, 78.2.0, 78.3.0, 78.3.1, 78.4.0, 78.4.1, 78.5.0, 78.6.0, 78.6.1

CPE External links

https://www.mozilla.org/en-US/security/advisories/mfsa2021-04/

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.



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