DB Electronica Telecomunicazioni Mozart FM Transmitter up to 7000 Setting download_setting.php filename null byte or nul character

Summaryinfo

A vulnerability marked as problematic has been reported in DB Electronica Telecomunicazioni Mozart FM Transmitter up to 7000. Impacted is an unknown function of the file /var/tdf/download_setting.php of the component Setting Handler. This manipulation of the argument filename causes improper neutralization of null byte or nul character. This vulnerability is tracked as CVE-2025-66263. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in DB Electronica Telecomunicazioni Mozart FM Transmitter up to 7000. It has been declared as problematic. Affected by this vulnerability is an unknown code of the file /var/tdf/download_setting.php of the component Setting Handler. The manipulation of the argument filename with an unknown input leads to a improper neutralization of null byte or nul character vulnerability. The CWE definition for the vulnerability is CWE-158. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The weakness was disclosed by Abdul Mhanni. It is possible to read the advisory at abdulmhsblog.com. This vulnerability is known as CVE-2025-66263 since 11/26/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

By approaching the search of inurl:var/tdf/download_setting.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• DB Electronica Telecomunicazioni

Name

• Mozart FM Transmitter

Version

• 30
• 50
• 100
• 300
• 500
• 1000
• 2000
• 3000
• 3500
• 6000
• 7000

CPE 2.3info

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CPE 2.2info

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