Bug 2366291 (CVE-2025-3877) - CVE-2025-3877 thunderbird: Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links
Summary: CVE-2025-3877 thunderbird: Unsolicited File Download, Disk Space Exhaustion, ...
Keywords:
Status: NEW
Alias: CVE-2025-3877
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-05-14 18:01 UTC by OSIDB Bzimport
Modified: 2025-06-10 15:05 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2025:8196 0 None None None 2025-05-27 10:01:08 UTC
Red Hat Product Errata RHSA-2025:8203 0 None None None 2025-05-27 12:22:37 UTC
Red Hat Product Errata RHSA-2025:8324 0 None None None 2025-05-29 21:28:25 UTC
Red Hat Product Errata RHSA-2025:8325 0 None None None 2025-05-29 22:54:01 UTC
Red Hat Product Errata RHSA-2025:8326 0 None None None 2025-05-29 19:29:54 UTC
Red Hat Product Errata RHSA-2025:8391 0 None None None 2025-06-02 17:29:03 UTC
Red Hat Product Errata RHSA-2025:8507 0 None None None 2025-06-04 11:43:46 UTC
Red Hat Product Errata RHSA-2025:8594 0 None None None 2025-06-05 10:54:53 UTC
Red Hat Product Errata RHSA-2025:8756 0 None None None 2025-06-10 09:38:26 UTC
Red Hat Product Errata RHSA-2025:8784 0 None None None 2025-06-10 15:05:04 UTC

Description OSIDB Bzimport 2025-05-14 18:01:53 UTC 
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. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.
Comment 1 errata-xmlrpc 2025-05-27 10:01:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:8196 https://access.redhat.com/errata/RHSA-2025:8196
Comment 2 errata-xmlrpc 2025-05-27 12:22:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:8203 https://access.redhat.com/errata/RHSA-2025:8203
Comment 3 errata-xmlrpc 2025-05-29 19:29:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Extended Update Support

Via RHSA-2025:8326 https://access.redhat.com/errata/RHSA-2025:8326
Comment 4 errata-xmlrpc 2025-05-29 21:28:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:8324 https://access.redhat.com/errata/RHSA-2025:8324
Comment 5 errata-xmlrpc 2025-05-29 22:54:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:8325 https://access.redhat.com/errata/RHSA-2025:8325
Comment 6 errata-xmlrpc 2025-06-02 17:29:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2025:8391 https://access.redhat.com/errata/RHSA-2025:8391
Comment 7 errata-xmlrpc 2025-06-04 11:43:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Via RHSA-2025:8507 https://access.redhat.com/errata/RHSA-2025:8507
Comment 8 errata-xmlrpc 2025-06-05 10:54:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2025:8594 https://access.redhat.com/errata/RHSA-2025:8594
Comment 9 errata-xmlrpc 2025-06-10 09:38:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:8756 https://access.redhat.com/errata/RHSA-2025:8756
Comment 10 errata-xmlrpc 2025-06-10 15:05:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2025:8784 https://access.redhat.com/errata/RHSA-2025:8784
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