CVE-2004-0880 in getmail
Summary
by MITRE
getmail 4.x before 4.2.0, when run as root, allows local users to overwrite arbitrary files via a symlink attack on an mbox file.
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Analysis
by VulDB Data Team • 06/02/2019
The vulnerability identified as CVE-2004-0880 affects getmail versions 4.x prior to 4.2.0 when executed with root privileges. This represents a critical security flaw that exploits the insecure handling of mailbox files during the mail retrieval process. The vulnerability specifically targets the way getmail manages temporary files and symbolic links when operating with elevated privileges, creating a path for local attackers to manipulate the system's file structure through malicious symlink manipulation.
The technical flaw stems from improper validation of file paths and symbolic link resolution within getmail's mailbox processing functionality. When getmail runs as root and processes mailboxes, it creates temporary files in predictable locations that can be exploited through race conditions or direct symlink manipulation. Attackers can create malicious symbolic links that point to sensitive system files, allowing them to overwrite critical files with arbitrary content. This type of vulnerability aligns with CWE-59 and CWE-377, which address improper handling of symbolic links and insecure temporary file creation respectively. The attack vector specifically enables privilege escalation and file system manipulation through local user compromise.
The operational impact of this vulnerability is severe as it allows local users to gain elevated privileges through file system manipulation. An attacker with local access can leverage this vulnerability to overwrite system configuration files, binaries, or other critical resources with malicious content. The vulnerability particularly affects systems where getmail is configured to run with root privileges for mail retrieval operations, which was common in many mail server configurations during that era. This creates a persistent threat vector that could lead to complete system compromise, data exfiltration, or service disruption.
Mitigation strategies for CVE-2004-0880 involve immediate patching of getmail to version 4.2.0 or later, which addresses the symbolic link handling issues through proper file path validation and secure temporary file creation. System administrators should also implement proper file permissions and avoid running getmail with root privileges when possible, instead using dedicated mail user accounts with appropriate permissions. The principle of least privilege should be enforced by configuring getmail to operate under non-privileged accounts and using proper access controls for mail directories. Additionally, monitoring for suspicious file creation patterns and implementing intrusion detection systems can help identify exploitation attempts. This vulnerability demonstrates the importance of secure file handling practices and aligns with ATT&CK technique T1068 which covers local privilege escalation through insecure file permissions and symbolic link manipulation.