CVE-2018-6527 in DIR-860L
Summary
by MITRE
XSS vulnerability in htdocs/webinc/js/adv_parent_ctrl_map.php in D-Link DIR-868L DIR868LA1_FW112b04 and previous versions, DIR-865L DIR-865L_REVA_FIRMWARE_PATCH_1.08.B01 and previous versions, and DIR-860L DIR860LA1_FW110b04 and previous versions allows remote attackers to read a cookie via a crafted deviceid parameter to soap.cgi.
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Analysis
by VulDB Data Team • 01/10/2020
The vulnerability identified as CVE-2018-6527 represents a cross-site scripting flaw within the web interface of several D-Link wireless router models including the DIR-868L, DIR-865L, and DIR-860L series. This issue affects firmware versions up to and including DIR868LA1_FW112b04, DIR-865L_REVA_FIRMWARE_PATCH_1.08.B01, and DIR860LA1_FW110b04, presenting a significant security risk to users who rely on these network devices for their home or small office environments. The vulnerability specifically resides in the htdocs/webinc/js/adv_parent_ctrl_map.php file and manifests through the soap.cgi endpoint when processing a crafted deviceid parameter.
The technical implementation of this vulnerability follows a classic XSS attack pattern where malicious input is not properly sanitized or validated before being processed by the web application. When a remote attacker crafts a malicious deviceid parameter and submits it to the soap.cgi endpoint, the application fails to adequately filter or escape the input before incorporating it into the response. This allows the attacker to inject malicious JavaScript code that executes in the context of a victim's browser session. The vulnerability is particularly concerning because it enables attackers to read cookies, which typically contain session identifiers and other sensitive authentication data that could be used to hijack user sessions or gain unauthorized access to the router's administrative interface.
The operational impact of this vulnerability extends beyond simple data theft, as it provides attackers with a potential pathway to full administrative control of affected devices. By leveraging the ability to read cookies, attackers can potentially obtain session tokens that allow them to impersonate legitimate users and access the router's web-based management interface without proper authentication. This could enable unauthorized configuration changes, network monitoring, or even the installation of malicious firmware updates. The vulnerability affects multiple D-Link router models, amplifying its potential impact across various network environments where these devices are deployed.
Security professionals should note that this vulnerability aligns with CWE-79, which describes cross-site scripting vulnerabilities, and follows patterns commonly associated with ATT&CK technique T1212, which involves exploitation of software vulnerabilities for remote code execution or privilege escalation. The attack surface is particularly concerning because it targets the web interface of network infrastructure devices, which are often less frequently updated than other systems and may be accessible from both internal and external networks. Organizations should prioritize updating affected D-Link devices to the latest firmware versions provided by the vendor, as these updates typically include input validation fixes and security patches that address such vulnerabilities. Additionally, network segmentation and access controls should be implemented to limit exposure of these devices to untrusted networks, and regular security assessments should be conducted to identify and remediate similar vulnerabilities in other network infrastructure components.