CVE-2024-45796 is a medium severity vulnerability classified as CWE-193 (Off-by-one Error) found in the Suricata network security monitoring engine developed by the Open Information Security Foundation (OISF). Suricata serves as an Intrusion Detection System (IDS), Intrusion Prevention System (IPS), and Network Security Monitoring (NSM) tool widely used to analyze network traffic for malicious activity. Prior to version 7.0.7, Suricata contained a logic error in its fragment reassembly code. Specifically, an off-by-one error during the reassembly of fragmented IP packets could cause Suricata to fail to correctly reassemble valid traffic. This failure can lead to dropped or improperly inspected packets, allowing attackers to craft specially designed fragmented packets that evade detection or cause disruptions in traffic analysis. The vulnerability is remotely exploitable without requiring authentication or user interaction, as it involves network packet processing. The impact is primarily on the integrity of Suricata's inspection capabilities, potentially allowing malicious payloads to bypass detection. Availability is not directly impacted, and confidentiality remains unaffected. The issue was addressed and fixed in Suricata version 7.0.7. The CVSS v3.1 base score is 5.3, reflecting a medium severity level due to the ease of exploitation and the potential for attackers to bypass security monitoring. No public exploits or active exploitation in the wild have been reported to date.

The primary impact of CVE-2024-45796 is on the integrity of network security monitoring performed by Suricata. By exploiting the off-by-one error in fragment reassembly, attackers can craft fragmented packets that Suricata fails to properly reassemble and inspect. This can allow malicious traffic to evade detection, potentially enabling network intrusions, data exfiltration, or the delivery of malware without triggering alerts. Organizations relying on Suricata for intrusion detection or prevention may have blind spots in their network visibility, increasing the risk of undetected attacks. While the vulnerability does not directly compromise confidentiality or availability, the loss of detection capability can indirectly lead to more severe security incidents. The ease of remote exploitation without authentication increases the threat level, especially in environments with high network exposure. The lack of known exploits in the wild reduces immediate risk but does not eliminate the potential for future attacks. Organizations with critical infrastructure, sensitive data, or compliance requirements are particularly at risk if they do not update to the patched version.

To mitigate CVE-2024-45796, organizations should upgrade Suricata to version 7.0.7 or later, where the off-by-one error in fragment reassembly has been fixed. Prior to upgrading, network administrators should audit their Suricata deployment versions and identify any instances running vulnerable releases. In environments where immediate upgrading is not feasible, consider implementing additional network-level protections such as strict packet filtering or limiting exposure of Suricata sensors to untrusted networks. Monitoring network traffic for anomalous fragmentation patterns may help detect attempts to exploit this vulnerability. Regularly review Suricata logs and alerts for signs of evasion or suspicious fragmented packets. Employ defense-in-depth strategies by combining Suricata with other security controls like firewalls and endpoint detection to reduce reliance on a single detection mechanism. Stay informed about any emerging exploit reports or patches related to this vulnerability. Finally, conduct thorough testing of Suricata updates in staging environments to ensure stability and compatibility before production deployment.