CVE-2007-0344 in Colloquy
Summary
by MITRE
Multiple format string vulnerabilities in (1) _invitedToRoom: and (2) _invitedToDirectChat: in Colloquy 2.1 and earlier allow remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via format string specifiers in the channel name of an INVITE request, related to the implementation of AlertSheet and AlertPanel in Apple AppKit.
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Analysis
by VulDB Data Team • 08/18/2024
The vulnerability CVE-2007-0344 represents a critical format string vulnerability affecting Colloquy 2.1 and earlier versions, specifically within the _invitedToRoom: and _invitedToDirectChat: methods. This flaw resides in the application's handling of IRC INVITE requests where remote attackers can manipulate channel names to contain malicious format specifiers. The vulnerability stems from improper input validation and sanitization within the AlertSheet and AlertPanel implementations of Apple's AppKit framework, which Colloquy utilizes for user interface notifications. These methods fail to properly escape or validate user-supplied data before passing it to formatting functions, creating an exploitable condition that can be leveraged by malicious actors.
The technical execution of this vulnerability occurs when an attacker sends an IRC INVITE message containing specially crafted format specifiers in the channel name parameter. When Colloquy processes this request and attempts to display the invitation notification through AlertSheet or AlertPanel, the application's string formatting functions interpret these malicious specifiers as instructions rather than literal text. This misinterpretation can lead to memory corruption, stack manipulation, and ultimately application crashes that result in denial of service conditions. The vulnerability is particularly dangerous because it can be triggered without requiring authentication or special privileges, making it an attractive target for remote exploitation. According to CWE-134, this represents a format string vulnerability where user-controllable data is used as a format string argument, which directly maps to the insecure coding practices that enable such attacks.
The operational impact of CVE-2007-0344 extends beyond simple denial of service to potentially enabling remote code execution in vulnerable configurations. When format string vulnerabilities are properly exploited, attackers can manipulate the program's execution flow by overwriting function return addresses, injecting malicious code into memory, or causing buffer overflows that lead to arbitrary code execution. The AlertSheet and AlertPanel components in AppKit are particularly susceptible because they often rely on standard printf-style formatting functions that do not perform adequate input validation. This vulnerability affects users who are actively participating in IRC networks where malicious actors can easily send crafted INVITE messages, potentially compromising the security of the entire communication session. The attack surface is broad since any user of Colloquy version 2.1 or earlier who receives an INVITE message with malicious formatting can be affected, making this a significant threat vector for remote attackers.
Mitigation strategies for CVE-2007-0344 should focus on immediate application updates and input validation improvements. The primary remediation involves upgrading to Colloquy versions that address this vulnerability through proper input sanitization and format string handling. Organizations should implement strict input validation on all user-supplied data before it is processed or displayed, particularly in notification systems that utilize formatting functions. The implementation should employ secure coding practices such as using snprintf instead of sprintf, or ensuring that user input is properly escaped before being passed to formatting functions. According to ATT&CK framework technique T1203, adversaries may exploit format string vulnerabilities to achieve code execution, making this vulnerability particularly concerning for security-conscious organizations. Network-level protections should include monitoring for unusual INVITE message patterns and implementing rate limiting on incoming IRC messages to prevent exploitation attempts. Additionally, system administrators should consider disabling or restricting IRC client functionality in environments where such vulnerabilities pose significant risks, particularly in high-security or compliance-sensitive contexts where the potential for remote code execution cannot be tolerated.