CVE-1999-1322 in ArcServe Backup
Summary
by MITRE
The installation of 1ArcServe Backup and Inoculan AV client modules for Exchange create a log file, exchverify.log, which contains usernames and passwords in plaintext.
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Analysis
by VulDB Data Team • 04/17/2026
The vulnerability described in CVE-1999-1322 represents a critical security flaw in the 1ArcServe Backup and Inoculan AV client modules for Microsoft Exchange environments. This issue stems from improper handling of authentication credentials during the installation process of these security tools, creating a persistent security risk that could compromise entire email infrastructures. The vulnerability specifically affects organizations that deploy these backup and antivirus solutions within Exchange server environments, where the handling of sensitive authentication data becomes paramount to overall security posture.
The technical flaw manifests through the creation of a log file named exchverify.log during the installation of the affected software modules. This log file contains usernames and passwords in plaintext format, meaning that any individual with access to the file can immediately obtain valid authentication credentials for the Exchange system. The vulnerability directly maps to CWE-312, which addresses the exposure of sensitive information through improper logging, and CWE-522, which covers insufficiently protected credentials. The plaintext storage of credentials represents a fundamental failure in information security principles, as it eliminates any cryptographic protection that might otherwise safeguard authentication data during storage.
The operational impact of this vulnerability extends far beyond the immediate compromise of individual accounts. When valid usernames and passwords are stored in plaintext within a log file, attackers can leverage these credentials to gain unauthorized access to Exchange servers, potentially leading to complete system compromise. This vulnerability enables privilege escalation attacks, allows for persistent backdoor access, and provides attackers with the ability to exfiltrate sensitive email data, manipulate email content, and conduct further reconnaissance within the network. The presence of these credentials in log files also creates a long-term risk as the log files may persist on systems for extended periods, providing attackers with sustained access opportunities.
Organizations affected by this vulnerability should immediately implement multiple layers of mitigation strategies to address the exposed credentials. The primary remediation involves removing the vulnerable software modules or ensuring that the exchverify.log file is properly secured and regularly monitored for unauthorized access. System administrators should implement strict file permission controls to prevent unauthorized access to log files containing sensitive information, while also establishing regular log file rotation and cleanup procedures. The vulnerability aligns with ATT&CK technique T1078, which covers valid accounts, and T1566, which covers credential access through various means. Additionally, organizations should conduct comprehensive security assessments to identify any other plaintext credential storage issues within their Exchange environments, as this vulnerability demonstrates the critical importance of proper credential handling and secure logging practices in enterprise security infrastructure.