CVE-2019-17524 in TC7300
Summary
by MITRE
An XSS vulnerability on Technicolor TC7300 STFA.51.20 devices allows remote attackers to inject arbitrary web script via the "Connected Clients" field to /wlanAccess.asp. An intranet host can use a crafted hostname to exploit this.
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Analysis
by VulDB Data Team • 02/13/2024
This vulnerability represents a critical cross-site scripting flaw in Technicolor TC7300 STFA.51.20 devices that resides within the web interface handling of connected client information. The vulnerability specifically affects the /wlanAccess.asp page where user-supplied data from the "Connected Clients" field is not properly sanitized or validated before being rendered back to the browser. This allows remote attackers to inject malicious javascript code through crafted input that gets executed in the context of other users' browsers who view the affected page. The attack vector is particularly concerning because it can be initiated from any intranet host that can reach the device, making it exploitable not only from external networks but also from within the same local network. The vulnerability stems from inadequate input validation and output encoding practices, which are fundamental security controls that should prevent such code injection scenarios.
The technical implementation of this vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is incorporated into web pages without proper validation or encoding. Attackers can craft malicious hostnames containing javascript payloads that get stored and subsequently executed when other users navigate to the wlanAccess.asp page. The attack requires no authentication and can be performed remotely, making it particularly dangerous in enterprise environments where multiple users might access the device's web interface. The vulnerability is classified as a stored XSS attack since the malicious input is persisted on the device and executed when other users view the affected page. This type of vulnerability can enable attackers to steal session cookies, perform actions on behalf of users, redirect them to malicious sites, or even execute arbitrary commands within the context of the victim's browser session.
The operational impact of this vulnerability extends beyond simple script execution and can lead to significant security compromises within the affected network infrastructure. An attacker who successfully exploits this vulnerability can establish persistent access to the network by stealing user sessions, redirecting traffic to malicious servers, or using the compromised device as a pivot point for further attacks. The vulnerability affects the device's wireless access management functionality, potentially allowing attackers to manipulate wireless client connections or gain unauthorized access to network resources. From an attacker's perspective, this vulnerability fits into the attack pattern described in the MITRE ATT&CK framework under the technique T1059.007 for command and script injection, and T1566 for credential access through social engineering or session hijacking. The attack can be particularly effective in environments where network administrators frequently monitor wireless client connections, as the malicious scripts would execute in the context of legitimate administrative sessions, making detection more difficult.
Mitigation strategies for this vulnerability should include immediate firmware updates from Technicolor to address the XSS flaw in the web interface implementation. Network administrators should also implement network segmentation to limit access to administrative interfaces and enforce strict input validation on all user-supplied data. The device configuration should be reviewed to ensure that only authorized users can access the wlanAccess.asp page, and that proper access controls are in place to prevent unauthorized modifications to client connection data. Additionally, implementing content security policies and output encoding controls can provide additional layers of protection against similar vulnerabilities in the future. Organizations should also conduct regular security assessments of network infrastructure devices to identify and remediate similar vulnerabilities before they can be exploited by malicious actors. The vulnerability highlights the importance of secure coding practices and input validation in web applications, particularly those managing network infrastructure where unauthorized access can have significant operational and security implications.