CVE-2003-1080 in Solaris
Summary
by MITRE
Unknown vulnerability in mail for Solaris 2.6 through 9 allows local users to read the email of other users.
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Analysis
by VulDB Data Team • 07/20/2025
The vulnerability identified as CVE-2003-1080 represents a critical security flaw in the mail subsystem of Solaris operating systems versions 2.6 through 9. This issue stems from improper access controls within the mail handling mechanisms that allow local users to bypass normal security boundaries and access email messages belonging to other users on the same system. The vulnerability operates at the kernel level within the mail service implementation, creating a privilege escalation path that fundamentally undermines the confidentiality of user communications. From a cybersecurity perspective, this represents a classic case of inadequate access control enforcement where the system fails to properly authenticate or authorize access requests to email resources.
The technical implementation of this vulnerability involves weaknesses in the mail daemon's file access controls and permission checking mechanisms. When local users execute specific commands or access mail directories through the system's mail handling interfaces, the underlying code fails to properly validate user credentials against the target mailbox ownership. This flaw typically manifests through improper file descriptor handling, where the system does not adequately verify that the requesting user has legitimate access rights to read messages in another user's mailbox. The vulnerability aligns with CWE-284 which specifically addresses improper access control issues, and represents a direct violation of the principle of least privilege that should govern all system resource access. The attack vector exploits the trust relationship between the mail service and local users, allowing malicious actors to traverse normal security boundaries without proper authentication.
The operational impact of CVE-2003-1080 extends beyond simple information disclosure, as it creates opportunities for broader system compromise and data exfiltration. Local users who exploit this vulnerability can access sensitive personal communications, business correspondence, and potentially confidential information that may contain passwords, financial data, or other critical details. This vulnerability is particularly concerning in multi-user environments where administrators and regular users share the same system, as it enables unauthorized access to potentially privileged accounts' mailboxes. The attack can be automated and does not require network connectivity, making it particularly stealthy and difficult to detect through traditional network monitoring. From an adversary perspective, this vulnerability maps directly to the ATT&CK technique T1005 for data from local system, and T1566 for credential access through exploitation of local services.
Mitigation strategies for CVE-2003-1080 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. The primary solution involves applying the official Solaris patches released by Sun Microsystems that correct the access control mechanisms in the mail subsystem. System administrators should also implement additional security measures such as restricting local user access to mail directories through proper file permissions and directory access controls. Network segmentation and monitoring of local mail service access can help detect unauthorized attempts to exploit this vulnerability. Organizations should conduct regular security audits to identify other potential access control flaws in legacy systems, as this vulnerability demonstrates the importance of proper privilege separation in system services. The remediation process should include comprehensive testing to ensure that mail functionality remains intact while properly enforcing user access controls. Additionally, implementing centralized logging and monitoring of mail service activities provides visibility into potential exploitation attempts and helps establish baseline behavior for anomaly detection systems.