vulnerability
Ubuntu: USN-7663-1 (CVE-2025-3522): Thunderbird vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:N/AC:M/Au:N/C:P/I:P/A:P) | Apr 15, 2025 | Jul 23, 2025 | Aug 18, 2025 |
Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
Apr 15, 2025
Added
Jul 23, 2025
Modified
Aug 18, 2025
Description
Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like chrome:// or SMB share file:// links, potentially leading to hashed Windows credential leakage and opening the door to more serious security issues. This vulnerability affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.
Solution
ubuntu-upgrade-thunderbird
References
- CVE-2025-3522
- https://attackerkb.com/topics/CVE-2025-3522
- CWE-601
- UBUNTU-USN-7663-1
- URL-https://bugzilla.mozilla.org/show_bug.cgi?id=1955372
- URL-https://ubuntu.com/security/notices/USN-7663-1
- URL-https://www.cve.org/CVERecord?id=CVE-2025-3522
- URL-https://www.mozilla.org/en-US/security/advisories/mfsa2025-27/#CVE-2025-3522
- URL-https://www.mozilla.org/security/advisories/mfsa2025-26/
- URL-https://www.mozilla.org/security/advisories/mfsa2025-27/
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