CVE-2014-4168 in iodine
Summary
by MITRE
(1) iodined.c and (2) user.c in iodine before 0.7.0 allows remote attackers to bypass authentication by continuing execution after an error has been triggering.
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Analysis
by VulDB Data Team • 12/16/2024
The vulnerability identified as CVE-2014-4168 affects iodine versions prior to 0.7.0 and represents a critical authentication bypass flaw that undermines the security model of the DNS tunneling tool. This issue manifests in two primary files iodined.c and user.c, where the software fails to properly terminate execution flow upon encountering error conditions, creating opportunities for unauthorized access. The flaw directly relates to improper error handling mechanisms that allow attackers to exploit the software's response to failure states.
This vulnerability falls under the CWE-252 category of "Unchecked Return Value" and aligns with ATT&CK technique T1071.004 for application layer protocol manipulation. The technical implementation error occurs when the iodine server processes client connections and encounters authentication failures or network errors. Instead of properly aborting the connection attempt and rejecting unauthorized access, the software continues executing subsequent code paths that should only be accessible to authenticated users. This behavior creates a window where malicious actors can manipulate the authentication flow and gain unauthorized access to the tunneling infrastructure.
The operational impact of this vulnerability is significant as it allows remote attackers to bypass the authentication mechanisms that are fundamental to the security of DNS tunneling operations. Attackers can exploit this flaw to establish unauthorized connections to the iodine server, potentially gaining access to the underlying network infrastructure and bypassing the intended security controls. The vulnerability affects both the server-side daemon (iodined.c) and client-side user management components (user.c), making it particularly dangerous as it can be exploited from multiple vectors within the system architecture. This authentication bypass enables attackers to perform actions that should require valid credentials, including accessing network resources, exfiltrating data, or establishing persistent access points.
The mitigation strategy for CVE-2014-4168 requires immediate deployment of iodine version 0.7.0 or later, which includes proper error handling and authentication flow controls. Organizations should also implement network monitoring to detect unusual DNS tunneling activity patterns that might indicate exploitation attempts. Security configurations should enforce strict authentication requirements and implement additional access controls beyond the basic authentication mechanisms. The fix addresses the root cause by ensuring that error conditions properly terminate execution flow and prevent continuation into unauthorized access paths, thereby restoring the intended security model of the application. Network administrators should also consider implementing firewall rules that restrict access to iodine server ports and monitor for suspicious DNS query patterns that could indicate exploitation attempts.