CVE-2007-2807 in Eggdrop IRC Bot
Summary
by MITRE
Stack-based buffer overflow in mod/server.mod/servrmsg.c in Eggdrop 1.6.18, and possibly earlier, allows user-assisted, remote IRC servers to execute arbitrary code via a long private message.
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Analysis
by VulDB Data Team • 01/12/2025
The vulnerability identified as CVE-2007-2807 represents a critical stack-based buffer overflow flaw within the Eggdrop IRC bot software version 1.6.18 and potentially earlier releases. This security defect resides in the mod/server.mod/servrmsg.c source file, specifically within the handling of private messages received through the IRC protocol. The vulnerability manifests when the software processes excessively long private messages, creating an exploitable condition that can be triggered by remote IRC servers under the control of an attacker. The flaw stems from inadequate input validation and bounds checking mechanisms that fail to properly constrain the length of incoming private messages before copying them into fixed-size stack buffers.
The technical implementation of this vulnerability follows a classic stack buffer overflow pattern where malicious actors can craft specially formatted private messages containing excessive data that exceeds the allocated buffer space. When the Eggdrop bot processes such messages, the overflow corrupts adjacent stack memory locations including return addresses and function parameters, potentially allowing attackers to overwrite critical execution flow control information. This type of vulnerability is classified under CWE-121 as a stack-based buffer overflow, which directly enables arbitrary code execution when properly exploited. The attack requires minimal user interaction since the vulnerability can be triggered remotely by IRC servers that are able to send the malicious message, making it particularly dangerous in networked environments where IRC communication is prevalent.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete control over the compromised Eggdrop bot instance. Once successfully exploited, the attacker gains the ability to execute arbitrary commands on the system hosting the IRC bot, potentially leading to full system compromise. The vulnerability affects installations where the Eggdrop bot is configured to receive private messages from remote IRC servers, making it a significant concern for IRC network operators and administrators who rely on these bots for automation and monitoring tasks. The remote nature of the attack means that an attacker does not require physical access to the system, and the user-assisted aspect indicates that the vulnerability requires some form of interaction from the target system, though this interaction is minimal and automated.
Mitigation strategies for CVE-2007-2807 focus on immediate software updates and defensive programming practices. The primary solution involves upgrading to Eggdrop version 1.6.19 or later, which contains the necessary patches to address the buffer overflow condition. Organizations should implement network segmentation and access controls to limit IRC server communication to trusted sources only, reducing the attack surface for potential exploitation attempts. Additionally, deploying intrusion detection systems that monitor for unusual private message patterns can help detect exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to techniques involving command and control communication and privilege escalation, with the exploitation occurring through the T1071.004 sub-technique for application layer protocol traffic. Implementing proper input validation and bounds checking in all network-facing applications helps prevent similar vulnerabilities from occurring in future implementations, aligning with defensive measures recommended under the MITRE ATT&CK methodology for preventing and detecting such exploitation patterns.