CVE-2004-2626

Vulnerability

The vulnerability resides in the Java API implementation of Siemens S55 cellular phones. A GUI overlay flaw allows a remote attacker to hide a malicious SMS message behind a legitimate confirmation dialog. When the user interacts with the visible dialog, the underlying malicious action is inadvertently confirmed, causing the phone to send an SMS without the user's knowledge or consent. The affected device is the Siemens S55 running the vulnerable Java API version; no specific firmware version is named in the available references [1].

Exploitation

An attacker must deliver a malicious Java application or content to the phone, which requires user interaction to install or open. Once executed, the malicious code creates a transparent overlay that positions a legitimate-looking confirmation dialog over the actual SMS-sending prompt. The user, believing they are confirming an innocuous action, instead authorizes the sending of an unauthorized SMS. No special network position beyond normal delivery channels (e.g., web download, MMS) is mentioned [1].

Impact

Successful exploitation results in the phone silently sending SMS messages to premium-rate numbers or other destinations specified by the attacker. This can lead to financial charges for the victim and potential disclosure of the phone number to third parties. The attacker does not gain direct access to other phone functions or data beyond the SMS capability [1].

Mitigation

No official patch or firmware update from Siemens is cited in the available references [1]. Users are advised to exercise caution when installing Java applications from untrusted sources and to review permission requests carefully. The device may be end-of-life; users should consider upgrading to a newer model with updated security controls.