CVE-2002-1158 in Canna
Summary
by MITRE
Buffer overflow in the irw_through function for Canna 3.5b2 and earlier allows local users to execute arbitrary code as the bin user.
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Analysis
by VulDB Data Team • 09/07/2025
The vulnerability identified as CVE-2002-1158 represents a critical buffer overflow flaw within the Canna input method system version 3.5b2 and earlier releases. This issue specifically affects the irw_through function which serves as a core component in the Canna framework responsible for processing input through various mechanisms. The buffer overflow vulnerability occurs when the function processes data without proper bounds checking, allowing malicious input to overwrite adjacent memory locations. This particular flaw is classified under CWE-121 as a stack-based buffer overflow, where insufficient validation of input data leads to memory corruption that can be exploited by local attackers.
The operational impact of this vulnerability extends beyond simple system instability to encompass complete privilege escalation capabilities. Local users who can execute code on the affected system gain the ability to execute arbitrary commands with the privileges of the bin user account, which typically holds elevated permissions within the system. This privilege level allows attackers to modify critical system files, install malicious software, or establish persistent backdoors. The vulnerability is particularly concerning because it requires no network access or remote exploitation capabilities, making it accessible through local system compromise or social engineering attacks. Attackers can leverage this flaw to gain unauthorized access to sensitive system resources and potentially escalate privileges to root level access depending on the system configuration.
The technical exploitation of this buffer overflow follows standard attack patterns where crafted input data is fed into the irw_through function to overwrite return addresses or other critical memory segments. The vulnerability demonstrates poor input validation practices and inadequate memory management within the Canna system, which violates fundamental security principles outlined in the OWASP Top Ten and CERT Secure Coding standards. The flaw specifically impacts systems running Canna 3.5b2 and earlier versions, making it a targeted issue for organizations maintaining legacy input method frameworks. Security researchers have documented similar patterns in other input processing functions where buffer overflow vulnerabilities remain prevalent in older software versions. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically leveraging local exploitation methods to gain elevated system access.
Mitigation strategies for CVE-2002-1158 primarily focus on immediate software updates and system hardening measures. Organizations should prioritize upgrading to Canna versions beyond 3.5b2 where the buffer overflow has been addressed through proper bounds checking and memory management improvements. System administrators should implement comprehensive patch management protocols to ensure all affected systems receive timely updates. Additionally, implementing runtime protections such as stack canaries, address space layout randomization, and non-executable stack segments can provide additional defense-in-depth measures. Access controls should be reviewed to minimize the attack surface by restricting local user privileges and implementing principle of least privilege models. Regular security audits and vulnerability assessments should be conducted to identify similar buffer overflow vulnerabilities in other system components. The remediation process should include monitoring system logs for potential exploitation attempts and implementing intrusion detection systems to alert on suspicious activities related to the affected function.