CVE-2021-23984
First published: Tue Mar 23 2021(Updated: )
A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Thunderbird | <78.9 | 78.9 |
| <87 | 87 | |
| <78.9 | 78.9 | |
| <78.9 | 78.9 | |
| Mozilla Firefox | <87.0 | |
| Mozilla Firefox ESR | <78.9 | |
| Mozilla Thunderbird | <78.9 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1693664
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-12/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-10/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-11/
- https://www.mozilla.org/security/advisories/mfsa2021-10/
- https://www.mozilla.org/security/advisories/mfsa2021-11/
- https://www.mozilla.org/security/advisories/mfsa2021-12/
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the vulnerability ID for this security issue?
The vulnerability ID for this security issue is CVE-2021-23984.
What is the severity level of CVE-2021-23984?
The severity level of CVE-2021-23984 is medium.
Which software products are affected by CVE-2021-23984?
The software products affected by CVE-2021-23984 are Mozilla Thunderbird (up to version 78.9), Mozilla Firefox (up to version 87), and Mozilla Firefox ESR (up to version 78.9).
How can a malicious extension exploit CVE-2021-23984?
A malicious extension can exploit CVE-2021-23984 by opening a popup window lacking an address bar and spoofing a website to trick the user into providing credentials.
Are there any remediation steps available for CVE-2021-23984?
Yes, the remediation steps for CVE-2021-23984 are provided by Mozilla. You can refer to the Mozilla security advisories MFSAs 2021-10 and 2021-12 for the specific steps.
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