CVE-2015-7282 in WRT300N-DD
Summary
by MITRE
ReadyNet WRT300N-DD devices with firmware 1.0.26 use the same source port number for every DNS query, which makes it easier for remote attackers to spoof responses by selecting that number for the destination port.
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Analysis
by VulDB Data Team • 11/10/2024
The ReadyNet WRT300N-DD wireless router device represents a significant security vulnerability through its predictable DNS query behavior that directly impacts network integrity and authentication mechanisms. This vulnerability affects firmware version 1.0.26 and exposes the device to sophisticated spoofing attacks that exploit the deterministic nature of its network communication patterns. The device's implementation of DNS resolution demonstrates a critical flaw in randomization protocols that should be fundamental to preventing man-in-the-middle attacks and DNS cache poisoning attempts. The vulnerability specifically manifests in the device's use of a fixed source port number for all DNS queries, creating a predictable communication pattern that adversaries can easily exploit.
The technical flaw stems from the device's failure to implement proper source port randomization during DNS resolution processes, which violates established security principles for network communication protocols. This predictable source port behavior creates a vulnerability that aligns with CWE-338, which addresses weaknesses in random number generation and the use of predictable values in security-sensitive contexts. The consistent source port selection allows attackers to anticipate and manipulate network responses by choosing matching destination ports, effectively enabling them to intercept and modify DNS traffic without requiring complex reconnaissance or advanced attack vectors. This weakness directly undermines the fundamental security assumptions of UDP-based DNS communications where port randomization serves as a critical defense mechanism against spoofing attacks.
The operational impact of this vulnerability extends beyond simple DNS manipulation to encompass broader network security implications that affect both internal and external network communications. Remote attackers can leverage this predictable pattern to conduct DNS cache poisoning attacks, redirect traffic to malicious destinations, or perform session hijacking activities that compromise the integrity of network communications. The vulnerability creates opportunities for attackers to establish persistent network footholds by manipulating DNS responses to redirect users to malicious websites or compromise network authentication processes. This weakness particularly affects environments where DNS security is critical for maintaining network integrity and where the device serves as a primary gateway for network traffic, making it an attractive target for adversaries seeking to establish long-term access to network resources.
Mitigation strategies for this vulnerability must address both immediate operational concerns and longer-term architectural improvements to prevent similar issues in network device implementations. Network administrators should implement DNS security measures such as DNSSEC deployment and DNS query validation to detect and prevent spoofed responses even when source port predictability exists. The device firmware should be updated to implement proper source port randomization for all DNS queries, ensuring that each DNS transaction uses a unique source port number within the ephemeral port range. Network monitoring systems should be enhanced to detect anomalous DNS query patterns and source port usage that may indicate exploitation attempts. Organizations should also consider implementing additional network segmentation and access controls to limit the potential impact of successful attacks, while following ATT&CK framework recommendations for network infiltration and credential access phases where this vulnerability could enable further compromise of network resources.