CVE-2010-3438 in libpoe-component-irc-perl
Summary
by MITRE
libpoe-component-irc-perl before v6.32 does not remove carriage returns and line feeds. This can be used to execute arbitrary IRC commands by passing an argument such as "some text\rQUIT" to the 'privmsg' handler, which would cause the client to disconnect from the server.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 02/11/2024
The vulnerability identified as CVE-2010-3438 affects the libpoe-component-irc-perl library version 6.32 and earlier, representing a critical security flaw in IRC client implementations. This vulnerability stems from insufficient input validation and sanitization within the library's handling of IRC protocol messages, specifically targeting the privmsg handler function. The flaw allows malicious actors to exploit the lack of proper character filtering, enabling command injection attacks through carefully crafted input strings that contain carriage return and line feed characters.
The technical implementation of this vulnerability leverages the fundamental structure of IRC protocol communication where commands are terminated by carriage return and line feed sequences. When the vulnerable library processes user input through the privmsg handler without properly sanitizing carriage return and line feed characters, it fails to distinguish between legitimate message content and embedded command sequences. An attacker can construct a malicious payload such as "some text\r\nQUIT" where the embedded carriage return and line feed characters (\r\n) cause the IRC client to interpret the embedded QUIT command as a legitimate protocol instruction rather than part of the message content.
This vulnerability operates at the application layer of the network stack and can be classified under CWE-77, which specifically addresses command injection flaws in software applications. The operational impact of this vulnerability extends beyond simple command execution to include complete session termination and potential unauthorized access to IRC client functionality. When the maliciously crafted message is processed, the embedded QUIT command causes the IRC client to disconnect from the server, effectively disrupting service availability and potentially allowing attackers to manipulate client-server communication flows. The vulnerability demonstrates the classic pattern of input validation failure where untrusted data is directly incorporated into protocol commands without proper sanitization.
The attack vector for this vulnerability is particularly concerning as it requires minimal complexity to exploit and can be executed through standard IRC client interactions. The flaw represents a fundamental security oversight in the library's design where it assumes that all input will be properly formatted and does not account for maliciously constructed payloads. From an operational standpoint, this vulnerability can be exploited to perform denial of service attacks against IRC clients, disrupt ongoing communications, and potentially enable more sophisticated attacks such as session hijacking or unauthorized command execution on compromised clients. The impact is amplified in environments where IRC clients are used for critical communications or automated services, as the disruption can cascade to affect larger network operations.
The recommended mitigation strategies include immediate upgrading to libpoe-component-irc-perl version 6.32 or later, which contains the necessary input sanitization patches. Organizations should implement comprehensive input validation at all points where IRC protocol messages are processed, specifically filtering or escaping carriage return and line feed characters before they are incorporated into protocol commands. Additionally, network segmentation and monitoring should be implemented to detect anomalous IRC traffic patterns that may indicate exploitation attempts. The vulnerability highlights the importance of following secure coding practices as outlined in the OWASP Top Ten and NIST cybersecurity guidelines, particularly focusing on input validation and output encoding to prevent injection attacks. System administrators should also consider implementing network-based intrusion detection systems that can identify and block suspicious IRC protocol sequences that contain embedded control characters, providing an additional layer of defense against exploitation of similar vulnerabilities in other IRC client implementations.