CVE-2000-1244 in InoculateIT Agent for Exchange
Summary
by MITRE
Computer Associates InoculateIT Agent for Exchange Server does not recognize an e-mail virus attachment if the SMTP header is missing the "From" field, which allows remote attackers to bypass virus protection.
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Analysis
by VulDB Data Team • 03/22/2025
The vulnerability described in CVE-2000-1244 represents a critical flaw in the Computer Associates InoculateIT Agent for Exchange Server email security solution. This weakness stems from the agent's improper handling of email message headers during virus scanning processes, specifically when the mandatory "From" field is absent from the SMTP header structure. The vulnerability exists within the email filtering logic that determines whether an incoming message should undergo comprehensive virus scanning procedures. When the "From" field is missing, the agent fails to properly classify the message as requiring security inspection, creating a significant bypass opportunity for malicious actors.
The technical implementation of this vulnerability demonstrates a classic input validation flaw that aligns with CWE-20, which covers improper input validation in software systems. The InoculateIT Agent's parsing logic appears to rely on the presence of standard SMTP header fields to make security decisions, but fails to account for malformed or incomplete headers that may be deliberately crafted to exploit this gap. This represents a failure in the agent's defensive design where it assumes all incoming messages will conform to standard email protocols, without implementing robust fallback mechanisms or comprehensive header validation procedures.
From an operational perspective, this vulnerability creates a substantial risk for organizations relying on the InoculateIT Agent for Exchange Server protection. Attackers can craft malicious emails with deliberately omitted "From" fields to bypass the virus scanning mechanism entirely, allowing malware to transit through the email gateway undetected. The impact extends beyond simple virus bypass, as this flaw could potentially enable more sophisticated attacks including phishing campaigns, spear phishing, or other social engineering attacks that rely on email delivery. The vulnerability affects the core security posture of Exchange Server environments, particularly those with less robust secondary security measures, as the protection layer fails to validate message integrity at the point of ingress.
The attack vector for this vulnerability operates through the standard email delivery process, where an attacker sends an email message with a missing "From" header field to a target organization's Exchange Server. The agent processes this message through its normal workflow but fails to recognize the need for virus scanning due to the missing header field, effectively allowing the malicious attachment to pass through the security controls. This type of attack aligns with ATT&CK technique T1192, which covers Spearphishing Attachments, and demonstrates how incomplete security validation can create exploitable gaps in email security architectures. Organizations with this vulnerability may experience increased risk of malware infections, data breaches, and compromised user systems through the delivery of malicious attachments that would normally be blocked by proper email filtering.
Mitigation strategies for this vulnerability should include immediate patching of the InoculateIT Agent software to address the header validation logic, implementing additional email security layers beyond the single-agent solution, and establishing more robust monitoring of email traffic patterns for anomalous header structures. Organizations should also consider implementing email header validation rules at the network level or through alternative security appliances to compensate for the agent's failure. The solution requires a comprehensive approach to email security that does not rely solely on a single protection mechanism, incorporating multiple validation points and ensuring that security controls function properly even when standard message formats are violated. Additionally, regular security assessments should verify that email security solutions properly handle malformed or edge-case message structures to prevent similar vulnerabilities from being exploited in the future.