CVE-2005-1152 in qpopper
Summary
by MITRE
popauth.c in qpopper 4.0.5 and earlier does not properly set the umask which may cause qpopper to create files with group or world-writable permissions.
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Analysis
by VulDB Data Team • 06/06/2019
The vulnerability described in CVE-2005-1152 affects qpopper version 4.0.5 and earlier, specifically within the popauth.c component of the software. This issue represents a significant security flaw that stems from improper umask configuration during file creation operations. The umask parameter controls the default permissions for newly created files and directories, and when improperly set, it can lead to files being created with overly permissive access rights that compromise system security.
The technical flaw occurs when qpopper fails to properly establish the umask value before creating authentication files or other sensitive data structures. This misconfiguration allows the software to create files with group or world-writable permissions, which violates fundamental security principles of least privilege and access control. The vulnerability is classified under CWE-732 as "Insufficient Permission Management" and represents a direct violation of proper file permission handling practices. When qpopper creates files without setting appropriate umask values, it essentially grants unauthorized users the ability to modify or overwrite critical authentication data, potentially leading to privilege escalation or unauthorized access to email accounts.
The operational impact of this vulnerability extends beyond simple permission misconfiguration and can result in serious security breaches within email server environments. An attacker who can exploit this weakness gains the ability to manipulate authentication files, potentially gaining access to user credentials or even elevating their privileges within the system. This vulnerability is particularly concerning in multi-user environments where qpopper serves as a POP3 server component, as it could enable attackers to compromise multiple user accounts. The flaw can be exploited through various attack vectors including direct file system manipulation or by leveraging the compromised authentication files to gain deeper system access. According to ATT&CK framework, this vulnerability maps to T1078 which covers Valid Accounts and T1566 which covers Phishing, as attackers can use compromised authentication mechanisms to establish persistent access.
Mitigation strategies for CVE-2005-1152 involve immediate patching of affected qpopper installations to versions that properly implement umask handling. System administrators should also conduct comprehensive audits of file permissions on existing qpopper installations to identify any files that may have been created with improper permissions. Additionally, implementing proper monitoring and alerting for unauthorized file modifications can help detect exploitation attempts. The fix requires ensuring that qpopper sets a restrictive umask value such as 077 before creating any sensitive files, which prevents group and world write permissions from being inherited. Organizations should also consider implementing principle of least privilege for qpopper processes and regularly review system configurations to prevent similar issues in other software components. The vulnerability demonstrates the critical importance of proper permission management in server applications and highlights the necessity of thorough security testing for file creation operations in network services.