CVE-2003-1352 in Gabber
Summary
by MITRE
Gabber 0.8.7 sends an email to a specific address during user login and logout, which allows remote attackers to obtain user session activity and Gabber version number by sniffing.
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Analysis
by VulDB Data Team • 06/16/2018
The vulnerability described in CVE-2003-1352 represents a significant security flaw in the Gabber instant messaging client version 0.8.7. This issue stems from the application's design decision to transmit email notifications to a predetermined address whenever users log in or log out of the system. The flaw creates an unintentional information disclosure channel that exposes critical operational details to any network observer capable of intercepting network traffic. This behavior fundamentally violates security principles by providing adversaries with actionable intelligence about user activity patterns and system configuration without requiring any authentication or privileged access.
The technical implementation of this vulnerability involves the client sending unencrypted email messages containing session metadata to a hardcoded recipient address during authentication events. This design pattern creates a persistent information leak that operates independently of user consent or awareness. Network sniffing tools can easily capture these email transmissions, extracting session identifiers, timestamps, and version information that collectively paint a detailed picture of user behavior and system state. The vulnerability specifically impacts the confidentiality aspect of the CIA triad, as it exposes sensitive operational data that should remain private to authorized parties. This flaw aligns with CWE-200, which categorizes improper information exposure as a fundamental weakness in information disclosure controls.
The operational impact of this vulnerability extends beyond simple information disclosure to create potential attack vectors for more sophisticated threats. Adversaries who intercept these communications can correlate login/logout patterns to identify user schedules, system availability windows, and potentially map user relationships within the organization. The disclosure of the Gabber version number provides attackers with specific version information that can be used to identify known vulnerabilities in the client software. This information can be leveraged to craft targeted attacks against specific versions of the application, potentially leading to privilege escalation or system compromise. The vulnerability also creates a persistent monitoring capability that can be exploited for long-term reconnaissance activities.
From a threat modeling perspective, this vulnerability demonstrates the importance of considering all network communications generated by client applications, not just those directly related to core functionality. The attack surface includes not only the primary communication channels but also auxiliary functions that may inadvertently expose sensitive information. This vulnerability exemplifies ATT&CK technique T1046, which involves the discovery of network services and T1083, which involves file and directory discovery, as adversaries can use the leaked information to map network topology and identify system characteristics. The lack of encryption or authentication for these email notifications represents a fundamental flaw in the application's security architecture that violates basic security design principles.
Mitigation strategies for this vulnerability require immediate implementation of network traffic encryption to prevent interception of sensitive communications. Organizations should deploy network monitoring solutions to detect and alert on unusual email traffic patterns that may indicate exploitation attempts. The most effective long-term solution involves modifying the application's behavior to eliminate the automatic email sending functionality or implementing secure communication channels for such notifications. Additionally, system administrators should consider implementing network segmentation to limit the scope of potential information leakage and deploy intrusion detection systems that can identify anomalous email traffic patterns. The vulnerability also highlights the need for comprehensive security testing that includes evaluation of all application-generated network communications, not just those related to primary functionality.