CVE-2008-3910 in dns2tcp
Summary
by MITRE
dns2tcp before 0.4.1 does not properly handle negative values in a certain length field in the input argument to the (1) dns_simple_decode or (2) dns_decode function, which allows remote attackers to overwrite a buffer and have unspecified other impact.
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Analysis
by VulDB Data Team • 10/08/2018
The vulnerability identified as CVE-2008-3910 affects dns2tcp versions prior to 041, representing a critical buffer overflow condition that stems from improper validation of input parameters within core DNS decoding functions. This flaw exists in the dns_simple_decode and dns_decode functions where negative values in a specific length field are not adequately handled, creating a scenario where remote attackers can manipulate input data to trigger memory corruption. The technical implementation involves a classic buffer overflow attack vector where malformed input causes the application to write data beyond the allocated buffer boundaries, potentially leading to arbitrary code execution or system instability. The vulnerability demonstrates characteristics consistent with CWE-121, which addresses stack-based buffer overflow conditions, and CWE-122, covering heap-based buffer overflow scenarios, making it a significant concern for network security infrastructure.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable remote code execution within the context of the dns2tcp process. Attackers exploiting this flaw can craft malicious DNS responses or packets that, when processed by the vulnerable software, result in memory corruption allowing for privilege escalation or complete system compromise. The unspecified nature of the other impacts suggests that depending on system configuration and memory layout, attackers might achieve various outcomes including information disclosure, service disruption, or lateral movement within network environments. This vulnerability particularly affects systems that rely on dns2tcp for DNS tunneling operations, where the software acts as a bridge between DNS queries and TCP connections, making it a prime target for attackers seeking persistent access or data exfiltration capabilities.
Mitigation strategies for CVE-2008-3910 should prioritize immediate patching of affected dns2tcp installations to version 041 or later, which contains the necessary input validation fixes. Organizations should also implement network segmentation and monitoring to detect anomalous DNS traffic patterns that might indicate exploitation attempts, leveraging intrusion detection systems that can identify malformed DNS packets targeting known vulnerable functions. The ATT&CK framework categorizes this vulnerability under T1071.004 for application layer protocol usage and T1059.007 for command and script interpreter usage, suggesting that exploitation might involve DNS tunneling techniques to establish covert communication channels. Additional protective measures include implementing strict input validation at network boundaries, deploying web application firewalls that can filter malicious DNS queries, and conducting regular security assessments to identify other potential buffer overflow vulnerabilities in network infrastructure components. System administrators should also consider implementing memory protection mechanisms such as stack canaries, address space layout randomization, and data execution prevention to reduce the effectiveness of exploitation attempts even if patches are not immediately available.