CVE-2005-0618 in Symantec
Summary
by MITRE
The SMTP binding function in Symantec Firewall/VPN Appliance 200/200R firmware after 1.5Z and before 1.68, Gateway Security 360/360R and 460/460R firmware before vuild 858, and Nexland Pro800turbo, when configured for load balancing between two WANs, might send SMTP traffic to a trusted network through an untrusted network.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 07/01/2019
The vulnerability identified as CVE-2005-0618 represents a critical network routing flaw in Symantec's firewall and VPN appliance products that affects multiple hardware models including the Firewall/VPN Appliance 200/200R series, Gateway Security 360/360R and 460/460R series, and Nexland Pro800turbo devices. This issue specifically manifests when these appliances are configured with load balancing capabilities between two wide area networks, creating a scenario where email traffic can be inadvertently routed through untrusted network segments. The flaw stems from improper handling of SMTP traffic within the appliance's routing mechanisms, particularly when the system attempts to distribute network load across multiple WAN connections. This vulnerability directly impacts the fundamental security principle of network segmentation by allowing potentially malicious actors to intercept or manipulate email communications that should remain isolated within trusted network boundaries. The affected firmware versions span across several product lines, indicating a widespread issue that would require coordinated patching efforts across multiple security devices within enterprise environments. This type of vulnerability is classified under CWE-284, which deals with improper access control, specifically in the context of network routing and traffic handling.
The technical implementation of this vulnerability occurs within the SMTP binding function of the affected appliances, where the routing decision-making process fails to properly validate the security context of traffic destinations. When load balancing is enabled between two WAN connections, the appliance's routing logic incorrectly determines that SMTP traffic destined for internal trusted networks should be transmitted through an untrusted network path. This misconfiguration allows for potential man-in-the-middle attacks where attackers can intercept email communications, modify content, or redirect traffic to malicious destinations. The flaw is particularly dangerous because it operates at the network layer where email traffic flows, making it difficult to detect through standard application-level monitoring. The vulnerability essentially creates a security bypass mechanism that allows traffic to traverse network boundaries in violation of the appliance's intended security policies, effectively undermining the network's perimeter protection mechanisms.
The operational impact of CVE-2005-0618 extends beyond simple traffic routing issues to potentially compromise the confidentiality and integrity of email communications within enterprise networks. Organizations utilizing these affected appliances face significant risk of data leakage, where sensitive email content could be exposed to unauthorized parties who gain access to the untrusted network segments. This vulnerability creates a pathway for attackers to perform eavesdropping on business communications, potentially accessing proprietary information, customer data, or confidential business discussions. The impact is particularly severe for organizations that rely heavily on email-based communication for critical business operations, as the vulnerability could facilitate targeted attacks or data exfiltration campaigns. Additionally, the flaw may enable attackers to inject malicious content into email traffic or redirect communications to compromised servers, creating potential for further exploitation within the network. The vulnerability's impact is amplified when considering that these appliances are typically deployed at network perimeters where they serve as primary security gateways, making them attractive targets for cyber adversaries.
Mitigation strategies for CVE-2005-0618 should prioritize immediate firmware updates from Symantec to address the specific routing logic flaws within the SMTP binding functions. Organizations must ensure that all affected appliances are updated to firmware versions that have been patched to properly validate routing decisions for SMTP traffic, particularly when load balancing is enabled. Network administrators should implement additional monitoring measures to detect unusual traffic patterns or unexpected routing behavior that might indicate exploitation attempts. The implementation of network segmentation controls, including the use of dedicated email servers and proper firewall rules, can help limit the impact of potential exploitation. Security teams should also consider implementing email encryption solutions such as S/MIME or PGP to protect email content even if routing issues occur. This vulnerability aligns with ATT&CK technique T1071.004 for application layer protocol: email protocols, where adversaries may exploit misconfigurations to gain access to email communications. Organizations should also conduct thorough security audits of their network infrastructure to identify any additional misconfigurations that might compound the risks associated with this vulnerability, ensuring that proper access controls and network segmentation principles are maintained throughout the enterprise network architecture.