CVE-2013-6413 in UnrealIRCd
Summary
by MITRE
Use-after-free vulnerability in UnrealIRCd 3.2.10 before 3.2.10.2 allows remote attackers to cause a denial of service (crash) via unspecified vectors. NOTE: this identifier was SPLIT per ADT2 due to different vulnerability types. CVE-2013-7384 was assigned for the NULL pointer dereference.
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Analysis
by VulDB Data Team • 03/09/2019
The CVE-2013-6413 vulnerability represents a critical use-after-free condition within UnrealIRCd version 3.2.10, specifically before the 3.2.10.2 patch release. This type of vulnerability occurs when a program continues to reference memory that has already been freed, creating a scenario where malicious actors can manipulate the program's memory state to execute arbitrary code or cause system instability. The vulnerability specifically affects the IRC daemon software that serves as a communication platform for users in chat environments, making it a significant concern for network administrators and security professionals managing these systems. The issue was classified under CWE-416, which specifically addresses the use of freed memory condition, a well-known weakness in memory management that has been documented in numerous security incidents throughout the history of software development.
The technical flaw in UnrealIRCd stems from improper memory management within the software's handling of specific IRC commands or connections. Attackers can exploit this vulnerability by sending carefully crafted malicious data to the IRC server, which triggers the use-after-free condition when the application attempts to process the data. This exploitation results in the application crashing, thereby causing a denial of service that prevents legitimate users from accessing the IRC service. The vulnerability's impact extends beyond simple service interruption as it demonstrates a fundamental flaw in the software's memory handling mechanisms, potentially allowing for more sophisticated attacks if the attacker can control the freed memory contents. The vulnerability's classification as a remote attack vector means that exploitation can occur without requiring physical access to the system, making it particularly dangerous in networked environments.
The operational impact of CVE-2013-6413 is significant for organizations relying on UnrealIRCd for their communication infrastructure, as the denial of service condition effectively renders the IRC service unavailable to legitimate users. This disruption can have cascading effects on communities that depend on these services for coordination, collaboration, and communication. In enterprise environments where IRC servers serve as internal communication channels, the vulnerability could disrupt business operations and compromise the availability of critical communication tools. The vulnerability also highlights the importance of timely security patch management, as the issue was resolved with the release of UnrealIRCd 3.2.10.2, demonstrating how quickly such flaws can be addressed once identified. Organizations should consider implementing network monitoring to detect unusual traffic patterns that might indicate exploitation attempts, as well as maintaining updated security intelligence feeds to stay informed about similar vulnerabilities in other IRC software implementations.
Organizations should implement immediate mitigation strategies including applying the official patch release 3.2.10.2 to address the vulnerability, as well as implementing network segmentation to isolate IRC services from critical infrastructure. Additional defensive measures include configuring firewall rules to restrict IRC service access to trusted networks only, implementing intrusion detection systems to monitor for exploitation attempts, and conducting regular security audits of IRC server configurations. The vulnerability also underscores the importance of following secure coding practices and conducting regular code reviews to identify potential memory management issues before they can be exploited by malicious actors. Organizations should also consider implementing application-level firewalls or proxies to filter potentially malicious traffic directed at IRC services, thereby reducing the attack surface and providing an additional layer of protection against similar vulnerabilities.