CVE-2008-3208 in Simple DNS Plus
Summary
by MITRE
Simple DNS Plus 4.1, 5.0, and possibly other versions before 5.1.101 allows remote attackers to cause a denial of service via multiple DNS reply packets.
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Analysis
by VulDB Data Team • 11/01/2024
Simple DNS Plus versions 4.1, 5.0, and potentially earlier releases contain a critical vulnerability that enables remote attackers to induce denial of service conditions through the deliberate transmission of multiple DNS reply packets. This vulnerability stems from insufficient input validation and improper handling of DNS response messages within the software's network processing pipeline. The flaw manifests when the application receives multiple DNS replies simultaneously or in rapid succession, causing the service to become unresponsive or crash entirely. The root cause lies in the software's failure to properly sanitize and validate incoming DNS packet structures, particularly concerning packet sequencing and message integrity checks. This weakness creates a condition where the DNS server's memory management and packet processing threads become overwhelmed or enter an inconsistent state when processing malformed or excessively frequent DNS responses.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be exploited to render the entire DNS resolution infrastructure unavailable to legitimate users. Attackers can leverage this weakness by crafting and sending multiple malicious DNS reply packets to the vulnerable system, potentially causing the application to consume excessive memory resources or enter an infinite loop during packet processing. The vulnerability affects the core DNS server functionality, making it impossible for the system to properly resolve domain names or respond to legitimate DNS queries. This creates cascading effects throughout networks that depend on the affected DNS service, potentially disrupting critical business operations, web browsing capabilities, and internal network communications. The vulnerability's exploitation requires minimal technical expertise, making it particularly dangerous as it can be leveraged by both skilled attackers and automated malware.
Security professionals should implement immediate mitigations including updating to Simple DNS Plus version 5.1.101 or later, which contains the necessary patches to address the DNS reply processing flaw. Network administrators should also consider implementing rate limiting mechanisms at the network perimeter to prevent excessive DNS reply packets from reaching the vulnerable system. Additional protective measures include configuring firewalls to monitor and restrict DNS traffic patterns, implementing intrusion detection systems that can identify anomalous DNS reply packet sequences, and establishing network segmentation to isolate the vulnerable DNS servers. Organizations should also conduct thorough vulnerability assessments to identify any other systems running vulnerable versions of Simple DNS Plus and ensure comprehensive patch management procedures are in place. The vulnerability aligns with CWE-129, which addresses issues related to input validation and improper handling of malformed data, and corresponds to ATT&CK technique T1498, which covers network denial of service attacks. The flaw represents a classic example of how insufficient error handling in network services can create exploitable conditions that allow remote attackers to compromise system availability and service integrity.