CVE-2016-4007 in Linux
Summary
by MITRE
Multiple unspecified vulnerabilities in the obs-service-extract_file package before 0.3-5.1 in openSUSE Leap 42.1 and before 0.3-3.1 in openSUSE 13.2 allow attackers to execute arbitrary commands via a service definition, related to executing unzip with "illegal options."
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Analysis
by VulDB Data Team • 10/06/2018
The vulnerability identified as CVE-2016-4007 affects the obs-service-extract_file package in openSUSE distributions, specifically impacting versions prior to 0.3-5.1 in openSUSE Leap 42.1 and 0.3-3.1 in openSUSE 13.2. This issue resides within the software packaging and build service infrastructure that facilitates automated software compilation and distribution within the openSUSE ecosystem. The vulnerability stems from improper handling of service definitions that are processed during package building operations, creating a potential security risk for systems that rely on these automated build processes.
The technical flaw manifests when the obs-service-extract_file component executes the unzip command with what are described as "illegal options." This represents a classic command injection vulnerability where attacker-controlled input is improperly integrated into system commands without adequate sanitization or validation. The vulnerability falls under CWE-78, which specifically addresses "Improper Neutralization of Special Elements used in an OS Command," and aligns with ATT&CK technique T1059.001 for executing operating system commands. When malicious service definitions are processed, the system fails to properly validate or escape special characters that could alter the intended command execution flow.
The operational impact of this vulnerability is significant for openSUSE users and administrators who depend on the openSUSE Build Service for package creation and distribution. Attackers could potentially execute arbitrary code on systems running affected versions of the obs-service-extract_file package, leading to complete system compromise. This risk is particularly concerning in environments where package building occurs in untrusted or shared environments, as it could enable privilege escalation or persistent backdoor installation. The vulnerability affects the integrity of the software supply chain, potentially allowing attackers to inject malicious code into packages before they are distributed to end users.
Mitigation strategies for CVE-2016-4007 primarily involve updating to the patched versions of the obs-service-extract_file package, specifically version 0.3-5.1 for openSUSE Leap 42.1 and 0.3-3.1 for openSUSE 13.2. System administrators should also implement strict validation of service definitions and avoid processing untrusted build configurations. Additional defensive measures include implementing proper input sanitization and command execution validation, monitoring for suspicious command patterns, and ensuring that automated build environments are isolated and secure. Organizations should also consider implementing principle of least privilege for build service operations and regularly audit their software supply chain processes to prevent similar vulnerabilities from being introduced.