CVE-2018-7052 in irsii
Summary
by MITRE
An issue was discovered in Irssi before 1.0.7 and 1.1.x before 1.1.1. When the number of windows exceeds the available space, a crash due to a NULL pointer dereference would occur.
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Analysis
by VulDB Data Team • 02/08/2023
The vulnerability identified as CVE-2018-7052 represents a critical memory safety issue within the Irssi IRC client software ecosystem. This flaw exists in versions prior to 1.0.7 and 1.1.x prior to 1.1.1, affecting a significant portion of the user base that relies on this popular terminal-based IRC client for communication and collaboration. The vulnerability manifests specifically under conditions where the number of windows exceeds the available display space, creating a scenario that leads to application instability and potential denial of service.
The technical nature of this vulnerability stems from a NULL pointer dereference condition that occurs during window management operations within the Irssi application. When the system attempts to handle window resizing or display management beyond the physical constraints of the terminal interface, the software fails to properly validate pointer references before dereferencing them. This classic memory safety issue falls under the CWE-476 category of NULL Pointer Dereference, which represents one of the most fundamental and dangerous categories of software vulnerabilities. The flaw essentially allows an attacker or legitimate user to trigger a crash condition by creating a scenario where the application attempts to access memory locations that have not been properly initialized or allocated.
The operational impact of CVE-2018-7052 extends beyond simple application crashes, potentially affecting the reliability and availability of IRC communication channels that depend on Irssi clients. In professional environments where IRC serves as a critical communication tool for development teams, system administrators, or collaborative projects, this vulnerability could lead to service disruption and communication breakdowns. The crash condition occurs during normal operational scenarios when users attempt to manage multiple windows, making this vulnerability particularly concerning as it can be triggered through legitimate application usage patterns rather than requiring malicious input. This characteristic places the vulnerability in the ATT&CK framework under the T1499 category of Network Denial of Service, as it can be exploited to disrupt communication services through application instability.
Mitigation strategies for CVE-2018-7052 primarily focus on immediate software updates to versions 1.0.7 and 1.1.1 or later, which contain the necessary code fixes to properly handle window management scenarios. System administrators should prioritize patching affected installations, particularly in environments where multiple users might be operating in high-window-count scenarios. The vulnerability also highlights the importance of proper input validation and memory management practices in terminal-based applications, emphasizing the need for comprehensive testing of edge cases in window management functionality. Additionally, organizations should consider implementing monitoring solutions to detect potential exploitation attempts and establish incident response procedures for handling application crashes that could indicate exploitation of similar memory safety vulnerabilities. The fix implemented in the patched versions typically involves adding proper NULL pointer checks and robust error handling within the window management subsystem, ensuring that the application gracefully handles display constraints rather than crashing when encountering such conditions.