CVE-2018-5550 in AirPrint
Summary
by MITRE
Versions of Epson AirPrint released prior to January 19, 2018 contain a reflective cross-site scripting (XSS) vulnerability, which can allow untrusted users on the network to hijack a session cookie or perform other reflected XSS attacks on a currently logged-on user.
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Analysis
by VulDB Data Team • 01/03/2020
The vulnerability identified as CVE-2018-5550 affects Epson AirPrint implementations released before January 19, 2018, representing a critical security flaw that exposes networked printing environments to sophisticated cyber threats. This vulnerability resides within the web interface components of Epson AirPrint devices that handle network requests and user interactions, creating an attack surface that adversaries can exploit to compromise authenticated sessions. The issue manifests as a reflective cross-site scripting vulnerability, which means that malicious actors can craft specially crafted web requests that, when executed by a victim's browser, will execute arbitrary code within the context of the victim's session. The vulnerability stems from insufficient input validation and output encoding within the AirPrint web server components, allowing untrusted network users to inject malicious scripts that are then reflected back to the victim's browser.
The technical exploitation of this vulnerability follows a classic reflective XSS attack pattern where an attacker crafts a malicious URL containing script payloads that, when visited by a user with an active AirPrint session, executes within the user's browser context. The reflected nature of the attack means that the malicious payload is embedded in a request sent to the vulnerable device and then reflected back to the user's browser without proper sanitization. This allows attackers to steal session cookies, which can then be used to impersonate legitimate users and gain unauthorized access to the printing environment. The vulnerability specifically targets the authentication mechanisms of AirPrint, potentially enabling attackers to hijack active user sessions and perform actions as if they were the authenticated user, including accessing print queues, modifying print settings, or executing unauthorized print jobs.
The operational impact of CVE-2018-5550 extends beyond simple session hijacking, as it can provide attackers with a foothold for further network exploration and lateral movement within corporate environments where AirPrint devices are deployed. Organizations with AirPrint-enabled printers may experience unauthorized access to sensitive print jobs, potential data exfiltration through malicious print job manipulation, and compromised printer configurations that could serve as entry points for broader network attacks. The vulnerability affects networked printing environments where users authenticate to AirPrint services, creating a vector for attackers to establish persistent access to print infrastructure and potentially gain insights into network topology through print job metadata. This represents a significant concern for enterprises that rely on AirPrint for document management and require secure handling of sensitive information.
Mitigation strategies for CVE-2018-5550 should prioritize immediate firmware updates from Epson to address the reflected XSS vulnerability, as this represents the most effective solution to prevent exploitation. Network segmentation and access controls should be implemented to limit unauthorized network access to AirPrint devices, reducing the attack surface available to potential adversaries. Additionally, organizations should deploy web application firewalls and input validation mechanisms to filter malicious requests before they reach vulnerable AirPrint components. Security monitoring should include detection of suspicious network traffic patterns associated with XSS attack payloads, and regular security assessments should verify that AirPrint devices are properly configured with secure settings. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws, and represents a technique commonly used in the ATT&CK framework under the T1059.007 category for command and scripting interpreter usage, as attackers can leverage the reflected XSS to execute malicious commands through compromised print sessions. Organizations should also implement regular patch management processes to ensure all networked printing devices receive timely security updates, as this vulnerability demonstrates the importance of maintaining current firmware versions to protect against known security flaws.