CVE-2015-3229 in spin-kickstarts
Summary
by MITRE
fedora-cloud-atomic.ks in spin-kickstarts allows remote attackers to conduct man-in-the-middle attacks by leveraging use of HTTP to download Fedora Atomic updates.
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Analysis
by VulDB Data Team • 11/25/2019
The vulnerability identified as CVE-2015-3229 resides within the fedora-cloud-atomic.ks configuration file used in spin-kickstarts, representing a significant security flaw that enables remote attackers to execute man-in-the-middle attacks against Fedora Atomic update mechanisms. This issue stems from the insecure use of HTTP protocols for downloading critical system updates, creating an exploitable vector that undermines the integrity and authenticity of the software distribution process. The vulnerability specifically affects systems that rely on the spin-kickstarts framework for automated provisioning and system deployment, particularly within cloud environments where atomic updates are commonly employed.
The technical flaw manifests through the absence of secure transport mechanisms when fetching Fedora Atomic updates, allowing attackers positioned within the network path to intercept and potentially modify update packages before they reach the target system. This insecure practice violates fundamental security principles by relying on unencrypted HTTP connections that are susceptible to packet interception, modification, and redirection attacks. The vulnerability is classified under CWE-319, which addresses the exposure of sensitive information through improper use of network protocols, specifically highlighting the weakness in cryptographic protection mechanisms. Attackers can exploit this by establishing malicious network positions to capture update traffic and substitute legitimate packages with malicious payloads, potentially compromising system integrity and executing arbitrary code.
The operational impact of this vulnerability extends beyond simple data interception, as it creates a persistent threat vector that can compromise entire fleet deployments in cloud environments. Systems relying on automated updates become vulnerable to supply chain attacks where attackers can inject malicious code into the update process, potentially affecting thousands of systems simultaneously. This vulnerability particularly impacts cloud infrastructure deployments where atomic updates are frequently used, as the attack surface expands to include all systems that utilize the vulnerable kickstart configuration. The threat is amplified in environments where network monitoring is insufficient, as the attack can remain undetected while malicious updates are silently installed on target systems. This weakness directly aligns with ATT&CK technique T1059.001, which involves executing malicious code through command and scripting interpreters, and T1566.001, focusing on the use of malicious updates in supply chain attacks.
Mitigation strategies for CVE-2015-3229 require immediate implementation of secure transport protocols and comprehensive security policy updates across affected systems. Organizations must transition from HTTP to HTTPS or alternative secure protocols for all update downloads, ensuring that cryptographic verification mechanisms are properly implemented and enforced. The remediation process involves updating the fedora-cloud-atomic.ks configuration files to mandate secure connections and implement certificate validation procedures that verify the authenticity of update sources. Security teams should also establish network monitoring capabilities to detect and prevent unauthorized interception attempts, while implementing certificate pinning mechanisms to prevent man-in-the-middle attacks. Additionally, organizations must conduct thorough vulnerability assessments to identify all systems utilizing the vulnerable kickstart configurations and ensure proper patch management protocols are in place to prevent similar vulnerabilities in future deployments. The implementation of these measures addresses both the immediate threat and establishes long-term security resilience against similar attack vectors.