CVE-2003-1377 in Smart IRC Daemon
Summary
by MITRE
Buffer overflow in the reverse DNS lookup of Smart IRC Daemon (SIRCD) 0.4.0 and 0.4.4 allows remote attackers to execute arbitrary code via a client with a long hostname.
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Analysis
by VulDB Data Team • 05/01/2019
The vulnerability identified as CVE-2003-1377 represents a critical buffer overflow flaw within the Smart IRC Daemon (SIRCD) version 0.4.0 and 0.4.4 implementations. This issue specifically targets the reverse DNS lookup functionality that occurs when clients connect to the IRC server. The flaw arises from inadequate input validation and bounds checking during hostname processing, creating an exploitable condition where malicious actors can manipulate the hostname field to trigger memory corruption. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which occurs when more data is written to a fixed-length buffer than it can accommodate, leading to potential memory overwrite conditions.
The technical exploitation of this vulnerability occurs when a remote attacker establishes a connection to the SIRCD server and provides an excessively long hostname value during the client registration process. The server's reverse DNS lookup mechanism attempts to resolve this hostname without proper bounds checking, allowing the attacker to overflow the allocated buffer space and potentially overwrite adjacent memory locations. This memory corruption can result in arbitrary code execution with the privileges of the SIRCD process, which typically runs with elevated system permissions. The attack vector is particularly dangerous as it requires no authentication and can be executed remotely, making it a significant threat to IRC server infrastructure. The vulnerability aligns with ATT&CK technique T1059.007 for command and script injection, as successful exploitation could enable attackers to execute arbitrary commands on the compromised system.
The operational impact of CVE-2003-1377 extends beyond immediate code execution capabilities to encompass broader system compromise and service availability threats. An attacker who successfully exploits this vulnerability can gain complete control over the affected IRC server, potentially using it as a launch point for further attacks against other networked systems. The compromised server may become part of a botnet, be used for malicious IRC communications, or serve as a pivot point for internal network reconnaissance. Additionally, the vulnerability affects the reliability and availability of IRC services, as successful exploitation could cause server crashes or unexpected behavior that disrupts legitimate user communications. Organizations running these vulnerable versions of SIRCD face significant risk of unauthorized access, data compromise, and potential regulatory compliance violations due to the exposure of critical infrastructure components. The vulnerability demonstrates the importance of proper input validation and memory management practices in network services, particularly those handling untrusted data from remote sources.
Mitigation strategies for CVE-2003-1377 should prioritize immediate patching and version updates to address the root cause of the buffer overflow. System administrators should upgrade to patched versions of SIRCD or migrate to more modern and actively maintained IRC server implementations that incorporate proper bounds checking and input validation mechanisms. Network segmentation and firewall rules can provide additional defense-in-depth measures by limiting direct access to IRC server ports and implementing rate limiting for connection attempts. Input sanitization measures should be implemented at the application level to validate hostname lengths and reject excessively long values before they can trigger buffer overflow conditions. Regular security auditing and penetration testing of IRC server configurations can help identify similar vulnerabilities in other network services. The vulnerability serves as a reminder of the critical importance of secure coding practices and the need for regular security updates to protect against known exploits in legacy software systems. Organizations should implement comprehensive software inventory management to identify and remediate vulnerable components across their infrastructure, ensuring that all network services maintain current security patches and follow established security guidelines for memory management and input validation.