CVE-2005-0226 in ngIRCd
Summary
by MITRE
Format string vulnerability in the Log_Resolver function in log.c for ngIRCd 0.8.2 and earlier, when compiled with IDENT, logging to SYSLOG, and with DEBUG enabled, allows remote attackers to execute arbitrary code.
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Analysis
by VulDB Data Team • 01/10/2025
The vulnerability identified as CVE-2005-0226 represents a critical format string vulnerability within the ngIRCd IRC server software version 0.8.2 and earlier. This flaw exists specifically within the Log_Resolver function located in the log.c source file, creating a pathway for remote attackers to execute arbitrary code on affected systems. The vulnerability manifests under specific compilation and operational conditions that significantly increase its exploitability and impact.
The technical flaw stems from improper handling of format strings in the Log_Resolver function, which occurs when the software is compiled with IDENT support, configured for SYSLOG logging, and operates with DEBUG mode enabled. When these conditions are met, user-supplied input that is processed through the logging mechanism can contain format specifiers that are interpreted by the printf family of functions. This improper input validation allows attackers to craft malicious input that can trigger format string exploitation techniques, potentially leading to stack corruption and arbitrary code execution.
The operational impact of this vulnerability is severe as it enables remote code execution without requiring authentication, making it particularly dangerous for publicly accessible IRC servers. Attackers can leverage this vulnerability to gain control over the affected system, potentially leading to complete compromise of the IRC server infrastructure. The vulnerability affects not only the immediate system but also any services or users relying on the compromised IRC network. The specific combination of compilation flags and operational settings required for exploitation means that organizations must carefully evaluate their deployment configurations to assess risk exposure.
Mitigation strategies for CVE-2005-0226 involve immediate patching of affected ngIRCd installations to version 0.8.3 or later, which contains the necessary fixes for the format string vulnerability. Organizations should also review their compilation and operational configurations to disable unnecessary features such as IDENT support, SYSLOG logging, and DEBUG mode when not required for operational purposes. Additionally, implementing network segmentation and access controls can help limit the potential impact of successful exploitation attempts. This vulnerability aligns with CWE-134, which specifically addresses format string vulnerabilities, and represents a typical example of how improper input validation in logging functions can create severe security implications. The attack vector for this vulnerability follows patterns consistent with ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation would likely involve executing arbitrary code through the compromised system. Organizations should also consider implementing runtime protections and monitoring for unusual logging patterns that might indicate exploitation attempts.