CVE-2006-2971 in Overkill
Summary
by MITRE
Integer overflow in the recv_packet function in 0verkill 0.16 allows remote attackers to cause a denial of service (daemon crash) via a UDP packet with fewer than 12 bytes, which results in a long length value to the crc32 function.
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Analysis
by VulDB Data Team • 01/16/2025
The vulnerability described in CVE-2006-2971 represents a critical integer overflow flaw within the 0verkill network daemon version 0.16. This vulnerability resides in the recv_packet function which processes incoming UDP packets, making it a prime target for remote exploitation. The flaw manifests when the daemon receives a malformed UDP packet containing fewer than 12 bytes of data, creating a scenario where the packet length field is interpreted as an excessively large value. This misinterpretation occurs due to improper validation of packet headers and length fields within the network processing logic, ultimately leading to a daemon crash through a cascading failure in the cyclic redundancy check implementation.
The technical exploitation of this vulnerability follows a specific attack pattern that leverages the fundamental weakness in integer handling within the network daemon's packet processing pipeline. When a UDP packet with insufficient data is received, the recv_packet function fails to properly validate the packet length field, causing an integer overflow condition. This overflow results in a massive length value being passed to the crc32 function, which then attempts to process an impossibly large data buffer. The underlying issue stems from CWE-190, which specifically addresses integer overflow conditions that can lead to memory corruption and system instability. The vulnerability demonstrates poor input validation practices and inadequate boundary checking mechanisms that are essential for robust network daemon security.
The operational impact of this vulnerability extends beyond simple denial of service, as it represents a fundamental security weakness that could potentially be exploited for more sophisticated attacks. A remote attacker capable of sending crafted UDP packets to the 0verkill daemon could reliably crash the service, disrupting network operations and potentially affecting network connectivity for legitimate users. The daemon's crash occurs due to the overflow condition causing memory allocation failures or buffer overflows within the crc32 processing routine, which is a common pattern in network daemon vulnerabilities. This type of vulnerability aligns with ATT&CK technique T1499.004, which covers network disruption through service availability attacks, and demonstrates how seemingly minor input validation flaws can lead to complete system compromise.
The mitigation strategies for this vulnerability require immediate implementation of proper input validation and integer boundary checking within the affected network daemon. System administrators should upgrade to patched versions of 0verkill that address the integer overflow condition in the recv_packet function, ensuring that all packet length fields are properly validated before being processed. Additionally, network-level protections such as firewall rules that filter malformed UDP packets and intrusion detection systems should be implemented to prevent exploitation attempts. The fix should include explicit bounds checking for packet length values and proper handling of edge cases where packet data is insufficient to meet protocol requirements. Organizations should also implement monitoring for unusual daemon crash patterns and establish incident response procedures to address potential exploitation attempts. This vulnerability serves as a reminder of the critical importance of robust input validation and proper integer handling in network security applications, particularly in daemon processes that handle untrusted network input.