CVE-2016-10081 in Shutter
Summary
by MITRE
/usr/bin/shutter in Shutter through 0.93.1 allows user-assisted remote attackers to execute arbitrary commands via a crafted image name that is mishandled during a "Run a plugin" action.
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Analysis
by VulDB Data Team • 11/30/2024
The vulnerability identified as CVE-2016-10081 resides within the Shutter screenshot application version 0.93.1 and earlier, specifically in the /usr/bin/shutter binary component. This represents a command injection flaw that occurs during the execution of plugin actions when processing user-provided image names. The vulnerability stems from inadequate input validation and sanitization mechanisms within the application's handling of image file names, particularly when these names are used in shell command execution contexts. Attackers can exploit this weakness by crafting malicious image names that contain shell metacharacters or commands, which then get executed with the privileges of the application process.
The technical exploitation of this vulnerability occurs through a user-assisted remote attack vector where an attacker convinces a victim to open a specially crafted image file through the Shutter application. When the application processes this malicious image name during a plugin execution, it fails to properly escape or sanitize the input before incorporating it into shell commands. This creates a classic command injection scenario where arbitrary commands can be executed on the target system. The flaw is particularly dangerous because it operates within a trusted application context, potentially allowing attackers to execute commands with the same privileges as the Shutter application itself, which typically runs with user-level permissions but may have elevated capabilities depending on system configuration.
The operational impact of this vulnerability extends beyond simple command execution, as it can enable attackers to perform various malicious activities including privilege escalation, data exfiltration, system reconnaissance, and persistence establishment. The vulnerability aligns with CWE-78, which specifically addresses OS Command Injection, and represents a common attack pattern categorized under the MITRE ATT&CK framework as T1059.001 - Command and Scripting Interpreter: PowerShell. The attack surface is broadened by the application's legitimate use cases where users frequently interact with various image files, making social engineering attacks particularly effective. The vulnerability affects systems where Shutter is installed and actively used, potentially compromising desktop environments and user workstations.
Mitigation strategies for this vulnerability should include immediate application updates to versions that address the command injection flaw, proper input validation and sanitization of all user-provided data, and implementation of privilege separation mechanisms. System administrators should ensure that the Shutter application is updated to the latest stable release where the input handling has been corrected. Additionally, organizations should consider implementing application whitelisting policies to restrict execution of potentially vulnerable applications, and deploy network monitoring solutions to detect suspicious command execution patterns. The vulnerability demonstrates the importance of secure coding practices, particularly in applications that handle user-provided data in shell contexts, and highlights the necessity of following security guidelines such as those outlined in the OWASP Top Ten and NIST Cybersecurity Framework. Organizations should also conduct regular vulnerability assessments and penetration testing to identify similar flaws in other applications and systems within their environment.