CVE-2008-5297 in No-IP DUC
Summary
by MITRE
Buffer overflow in No-IP DUC 2.1.7 and earlier allows remote HTTP servers to execute arbitrary code via a crafted response to a DNS update request, related to a missing length check in the GetNextLine function.
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Analysis
by VulDB Data Team • 11/11/2024
The vulnerability identified as CVE-2008-5297 represents a critical buffer overflow flaw within the No-IP Dynamic Update Client version 2.1.7 and earlier implementations. This security weakness specifically affects the client software used for maintaining dynamic DNS records through the No-IP service platform. The vulnerability manifests when the client receives a maliciously crafted HTTP response from a remote server during the DNS update process, creating a pathway for remote code execution. The root cause stems from inadequate input validation within the GetNextLine function, which fails to properly verify the length of incoming data before processing it into a fixed-size buffer structure. This fundamental flaw in the software architecture creates an exploitable condition that can be leveraged by attackers positioned remotely to compromise systems running vulnerable versions of the No-IP DUC client.
The technical exploitation of this vulnerability follows a well-defined pattern that aligns with common buffer overflow attack methodologies and maps directly to CWE-121, which describes stack-based buffer overflow conditions. When the vulnerable client attempts to process a crafted HTTP response containing excessive data, the GetNextLine function does not perform adequate bounds checking before copying data into a predetermined buffer location. This omission allows attackers to overwrite adjacent memory locations, potentially including return addresses or other critical program variables, thereby enabling arbitrary code execution. The attack vector specifically targets the HTTP communication channel between the client and the No-IP update server, making it particularly dangerous as it can be executed without requiring authentication or direct access to the target system. The vulnerability's remote nature means that attackers can exploit it from anywhere on the internet, provided they can intercept or manipulate HTTP responses intended for the vulnerable client software.
The operational impact of this vulnerability extends beyond simple remote code execution, as it can lead to complete system compromise and persistent access for malicious actors. Organizations relying on No-IP DUC clients for dynamic DNS management face significant risk, particularly in environments where these clients operate on network infrastructure or security-critical systems. The vulnerability affects systems that depend on automated DNS updates, potentially allowing attackers to gain unauthorized access to network resources, modify DNS records to redirect traffic, or establish persistent backdoors. From an attacker's perspective, this vulnerability provides a straightforward path to system compromise with minimal technical skill required, making it attractive for both automated attacks and targeted exploitation campaigns. The implications are particularly severe for enterprise environments where dynamic DNS updates are common and may be used for critical infrastructure management.
Mitigation strategies for CVE-2008-5297 must address both immediate remediation and long-term security posture improvements. The primary and most effective solution involves upgrading to a patched version of the No-IP DUC client, as the vulnerability was resolved in subsequent releases through proper implementation of length validation in the GetNextLine function. Organizations should also implement network-level protections such as firewall rules to restrict communication with the No-IP update servers to trusted sources only, and consider deploying intrusion detection systems that can identify malformed HTTP responses targeting this specific vulnerability. Additionally, network segmentation and monitoring should be enhanced to detect anomalous DNS update activities that might indicate exploitation attempts. The vulnerability's characteristics also align with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation would enable attackers to execute arbitrary code on compromised systems. Regular security assessments and vulnerability scanning should be implemented to identify any remaining instances of vulnerable software within the organization's infrastructure.