CVE-2002-1278 in linuxconf
Summary
by MITRE
The mailconf module in Linuxconf 1.24, and other versions before 1.28, on Conectiva Linux 6.0 through 8, and possibly other distributions, generates the Sendmail configuration file (sendmail.cf) in a way that configures Sendmail to run as an open mail relay, which allows remote attackers to send Spam email.
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Analysis
by VulDB Data Team • 05/25/2019
The vulnerability identified as CVE-2002-1278 represents a critical configuration flaw in the mailconf module of Linuxconf version 1.24 and earlier, affecting Conectiva Linux 6.0 through 8 and potentially other distributions. This issue stems from improper generation of Sendmail configuration files during the system configuration process, creating a fundamental security weakness that enables unauthorized email relaying. The vulnerability operates at the system administration level where configuration tools fail to properly secure mail server settings, resulting in a misconfiguration that fundamentally compromises email security.
The technical flaw manifests in how the mailconf module handles Sendmail configuration file generation, specifically the sendmail.cf file that controls Sendmail's operational behavior. When the vulnerable Linuxconf version processes mail server configuration, it fails to properly restrict relay permissions, leaving the Sendmail daemon configured to accept and forward email messages from any remote source without proper authentication or access controls. This configuration creates an open relay scenario where the system becomes an unwitting participant in email spam distribution networks, as the Sendmail service operates with overly permissive relay settings that bypass normal security mechanisms.
The operational impact of this vulnerability extends far beyond simple configuration errors, as it transforms affected systems into spam distribution points that can be exploited by remote attackers without requiring any special privileges or advanced techniques. The vulnerability enables attackers to leverage compromised or misconfigured systems to send spam emails through the open relay, effectively turning the affected servers into spam relays that can be used for various malicious activities including phishing campaigns, malware distribution, and other forms of email-based attacks. This makes the affected systems valuable assets for cybercriminals seeking to obscure their attack origins while conducting large-scale spam operations.
The security implications of CVE-2002-1278 align with CWE-264, which addresses permissions, privileges, and access controls, specifically focusing on improper access control in system configuration tools. From an adversarial perspective, this vulnerability maps directly to ATT&CK technique T1192, which involves the use of compromised systems to send spam or phishing emails, and T1071.004, which covers application layer protocol usage for command and control communications. The vulnerability represents a classic case of configuration management failure where administrative tools fail to enforce security best practices during system setup, creating persistent security weaknesses that can be exploited for extended periods without detection.
Mitigation strategies for this vulnerability require immediate patching of the Linuxconf package to version 1.28 or later, which contains the corrected configuration generation logic. System administrators should also perform thorough security audits of Sendmail configurations on affected systems, ensuring that relay restrictions are properly implemented and that the sendmail.cf file contains appropriate access control directives. Network-level protections such as firewall rules and email filtering systems can provide additional defense in depth, while regular monitoring of mail server logs should be implemented to detect unusual relay activity. The vulnerability highlights the critical importance of secure configuration management practices and demonstrates how seemingly benign administrative tools can create significant security risks when they fail to properly enforce security policies during system setup operations.