When handling the filename directive in the Content-Disposition header, the filename would be truncated if the filename contained a NULL character. This could have led to reflected file download attacks potentially tricking users to install malware. This vulnerability affects Firefox < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for Android < 112, and Thunderbird < 102.10.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-29539
• https://bugzilla.mozilla.org/show_bug.cgi?id=1784348
• https://www.mozilla.org/security/advisories/mfsa2023-13
• https://www.mozilla.org/security/advisories/mfsa2023-14
• https://www.mozilla.org/security/advisories/mfsa2023-15