// For flags

CVE-2023-3417

thunderbird: File Extension Spoofing using the Text Direction Override Character

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

Thunderbird allowed the Text Direction Override Unicode Character in filenames. An email attachment could be incorrectly shown as being a document file, while in fact it was an executable file. Newer versions of Thunderbird will strip the character and show the correct file extension. This vulnerability affects Thunderbird < 115.0.1 and Thunderbird < 102.13.1.

Junsung Lee discovered that Thunderbird did not properly validate the text direction override unicode character in filenames. An attacker could potentially exploits this issue by spoofing file extension while attaching a file in emails. Max Vlasov discovered that Thunderbird Offscreen Canvas did not properly track cross-origin tainting. An attacker could potentially exploit this issue to access image data from another site in violation of same-origin policy.

*Credits: 이준성 (Junsung Lee)
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Complete
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2023-06-26 CVE Reserved
  • 2023-07-24 CVE Published
  • 2025-02-13 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-434: Unrestricted Upload of File with Dangerous Type
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Mozilla
Search vendor "Mozilla"
Thunderbird
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< 102.13.1
Search vendor "Mozilla" for product "Thunderbird" and version " < 102.13.1"
-
Affected
Mozilla
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Thunderbird
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>= 115.0 < 115.0.1
Search vendor "Mozilla" for product "Thunderbird" and version " >= 115.0 < 115.0.1"
-
Affected
Debian
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Debian Linux
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10.0
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-
Affected
Debian
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Debian Linux
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11.0
Search vendor "Debian" for product "Debian Linux" and version "11.0"
-
Affected
Debian
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Debian Linux
Search vendor "Debian" for product "Debian Linux"
12.0
Search vendor "Debian" for product "Debian Linux" and version "12.0"
-
Affected