CVE-2012-4245 in GIMP
Summary
by MITRE
The scriptfu network server in GIMP 2.6 does not require authentication, which allows remote attackers to execute arbitrary commands via the python-fu-eval command.
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Analysis
by VulDB Data Team • 12/12/2021
The vulnerability identified as CVE-2012-4245 resides within the scriptfu network server component of GIMP version 2.6, representing a critical security flaw that undermines the integrity and confidentiality of systems running this software. This issue specifically affects the network server functionality that enables remote command execution capabilities, creating an avenue for malicious actors to exploit the system without proper authorization. The vulnerability stems from the absence of authentication mechanisms within the scriptfu network server, which is designed to provide scripting capabilities for image manipulation tasks. When GIMP operates in network server mode, it exposes various commands through a network interface, including the python-fu-eval command that allows execution of arbitrary Python code. This design flaw creates a dangerous attack surface where remote adversaries can leverage the network server to execute malicious commands on the target system, potentially leading to complete system compromise.
The technical implementation of this vulnerability involves the scriptfu network server's failure to validate incoming requests and authenticate users before processing commands. The python-fu-eval command specifically enables execution of arbitrary Python code, which when exposed through an unauthenticated network interface becomes a direct path to remote code execution. This vulnerability aligns with CWE-284, which describes improper access control mechanisms, and represents a classic example of insufficient authentication in network services. The flaw operates at the application layer where the network server processes commands without requiring any form of user verification, authentication tokens, or access control validation. Attackers can simply connect to the GIMP network server and issue commands through the exposed interface, bypassing all normal security controls that would typically prevent unauthorized access to system resources.
The operational impact of CVE-2012-4245 extends far beyond simple privilege escalation, as it provides attackers with complete control over systems running vulnerable versions of GIMP. This vulnerability can be exploited to install malware, modify system files, access sensitive data, or establish persistent backdoors within the compromised environment. The attack vector is particularly concerning because it does not require any special privileges or complex exploitation techniques, making it accessible to threat actors of varying skill levels. The vulnerability affects any system where GIMP is running in network server mode and has not been patched, potentially impacting desktop environments, development workstations, and servers where image processing applications are deployed. Organizations using GIMP for legitimate image editing tasks may unknowingly expose their systems to remote exploitation, especially in environments where network services are enabled by default or where administrative oversight is insufficient.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. The primary and most effective mitigation involves updating to a patched version of GIMP that resolves the authentication issue within the scriptfu network server. Organizations should also implement network segmentation and access control measures to limit exposure of GIMP network services to trusted networks only. Disabling the network server functionality entirely when not required provides an additional layer of defense, as does implementing proper firewall rules to restrict access to the specific ports used by the scriptfu network server. From an operational security perspective, regular vulnerability assessments and patch management processes should be implemented to identify and remediate similar issues. The ATT&CK framework categorizes this vulnerability under initial access and execution tactics, specifically targeting the network service attack surface and remote code execution capabilities. System administrators should also monitor for unusual network activity related to GIMP services and implement intrusion detection systems to identify potential exploitation attempts. Regular security awareness training for users who might inadvertently enable vulnerable network services can also help prevent exploitation through social engineering or misconfiguration scenarios.