CVE-2025-66263

published 2025-11-26

CVE-2025-66263: Unauthenticated Arbitrary File Read via Null Byte Injection in DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter versions 30, 50, 100, 300, 500…

Priority P3 52 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C H I N A N

Unauthenticated Arbitrary File Read via Null Byte Injection in DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter versions 30, 50, 100, 300, 500, 1000, 2000, 3000, 3500, 6000, 7000 allows an attacker to perform Null byte injection in download_setting.php allows reading arbitrary files.
The `/var/tdf/download_setting.php` endpoint constructs file paths by concatenating user-controlled `$_GET['filename']` with a forced `.tgz` extension. Running on PHP 5.3.2 (pre-5.3.4), the application is vulnerable to null byte injection (%00), allowing attackers to bypass the extension restriction and traverse paths. By requesting `filename=../../../../etc/passwd%00`, the underlying C functions treat the null byte as a string terminator, ignoring the appended `.tgz` and enabling unauthenticated arbitrary file disclosure of any file readable by the web server user.

Affected

11 ranges

Vendor	Product	Version range	Fixed in
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—
db_electronica_telecomunicazioni_s.p.a	mozart_fm_transmitter	—	—

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd v4.0 8.9 HIGH CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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CWE-158