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                            CERT-Renater

                Note d'Information No. 2025/VULN354

_____________________________________________________________________

DATE                : 11/06/2025

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Thunderbird versions prior to
                                  139.0.2, 128.11.1.

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https://www.mozilla.org/en-US/security/advisories/mfsa2025-50/
https://www.mozilla.org/en-US/security/advisories/mfsa2025-49/
_____________________________________________________________________


Mozilla Foundation Security Advisory 2025-50
Security Vulnerabilities fixed in Thunderbird 139.0.2

Announced        June 10, 2025
Impact           high
Products         Thunderbird
Fixed in
        Thunderbird 139.0.2


#CVE-2025-5986: Unsolicited File Download, Disk Space Exhaustion,
and Credential Leakage via mailbox:/// Links

Reporter         Dario Weißer
Impact           high

Description

A crafted HTML email using mailbox:/// links can trigger automatic,
unsolicited downloads of .pdf files to the user's desktop or home
directory without prompting, even if auto-saving is disabled. This
behavior can be abused to fill the disk with garbage data (e.g.
using /dev/urandom on Linux) or to leak Windows credentials via
SMB links when the email is viewed in HTML mode. While user
interaction is required to download the .pdf file, visual
obfuscation can conceal the download trigger. Viewing the email
in HTML mode is enough to load external content.


References

    Bug 1958580, 1968012


_____________________________________________________________________


Mozilla Foundation Security Advisory 2025-49
Security Vulnerabilities fixed in Thunderbird 128.11.1

Announced        June 10, 2025
Impact           high
Products         Thunderbird
Fixed in
        Thunderbird 128.11.1

#CVE-2025-5986: Unsolicited File Download, Disk Space Exhaustion,
and Credential Leakage via mailbox:/// Links

Reporter         Dario Weißer
Impact           high

Description

A crafted HTML email using mailbox:/// links can trigger automatic,
unsolicited downloads of .pdf files to the user's desktop or home
directory without prompting, even if auto-saving is disabled. This
behavior can be abused to fill the disk with garbage data (e.g.
using /dev/urandom on Linux) or to leak Windows credentials via
SMB links when the email is viewed in HTML mode. While user
interaction is required to download the .pdf file, visual
obfuscation can conceal the download trigger. Viewing the email
in HTML mode is enough to load external content.


References

    Bug 1958580, 1968012



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+ CERT-RENATER        |    tel : 01-53-94-20-44         +
+ 23/25 Rue Daviel    |    fax : 01-53-94-20-41         +
+ 75013 Paris         |   email:cert@support.renater.fr +
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