CVE-2010-2075 in UnrealIRCd
Summary
by MITRE
UnrealIRCd 3.2.8.1, as distributed on certain mirror sites from November 2009 through June 2010, contains an externally introduced modification (Trojan Horse) in the DEBUG3_DOLOG_SYSTEM macro, which allows remote attackers to execute arbitrary commands.
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Analysis
by VulDB Data Team • 12/05/2024
The vulnerability identified as CVE-2010-2075 represents a critical security flaw in UnrealIRCd version 3.2.8.1 that was introduced through malicious modification of the software distribution process. This particular version of the IRC server software was compromised during its distribution cycle between November 2009 and June 2010, when certain mirror sites hosted versions that contained a trojan horse backdoor. The malicious code was specifically embedded within the DEBUG3_DOLOG_SYSTEM macro, which is a component of the software's logging functionality that should have been benign. This type of compromise falls under the category of supply chain attacks where legitimate software distributions are tainted with malicious code before reaching end users.
The technical implementation of this vulnerability exploits the way UnrealIRCd handles system logging operations through the DEBUG3_DOLOG_SYSTEM macro. When the IRC server processes certain logging commands or system operations, the malicious code within this macro is executed with the privileges of the running IRC daemon process. This allows remote attackers to execute arbitrary commands on the affected system without requiring authentication or prior access to the server. The vulnerability demonstrates a classic example of code injection through compromised software distribution channels, where the attacker's code is seamlessly integrated into what appears to be legitimate software functionality. This flaw directly relates to CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and represents a severe form of privilege escalation that can result in complete system compromise.
The operational impact of CVE-2010-2075 extends far beyond simple remote code execution, as it provides attackers with complete control over affected systems running the compromised UnrealIRCd version. Once exploited, attackers can establish persistent backdoors, harvest sensitive information from the network, use the compromised servers for further attacks, or deploy additional malware. The vulnerability affects any system running the specific version of UnrealIRCd that was distributed through the compromised mirror sites, making it particularly dangerous for organizations that rely on third-party software distribution channels. The attack vector is particularly insidious because it requires no specialized knowledge of the target system beyond basic network connectivity, and the malicious code operates silently within the normal operation of the IRC server software. This vulnerability aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: Unix Shell" and represents a sophisticated approach to achieving persistent access through software supply chain compromise.
Organizations affected by this vulnerability should immediately implement multiple layers of mitigation strategies to protect their infrastructure. The primary remediation involves updating to a verified, unmodified version of UnrealIRCd that does not contain the malicious code, while ensuring that all software downloads are obtained from official sources and verified through cryptographic checksums or digital signatures. Network monitoring should be enhanced to detect unusual outbound connections or command execution patterns that may indicate exploitation attempts. System administrators should also review existing access controls and implement principle of least privilege for IRC server processes. Additional security measures include network segmentation to isolate IRC services, regular security audits of software installations, and implementation of software integrity monitoring solutions that can detect unauthorized modifications to critical system components. The incident serves as a critical reminder of the importance of supply chain security and the necessity of verifying software authenticity before deployment in production environments.