CVE-2017-7480 in rkhunter
Summary
by MITRE
rkhunter versions before 1.4.4 are vulnerable to file download over insecure channel when doing mirror update resulting into potential remote code execution.
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Analysis
by VulDB Data Team • 10/31/2019
The vulnerability identified as CVE-2017-7480 affects rkhunter versions prior to 1.4.4 and represents a critical security flaw in the system integrity checking tool's update mechanism. This vulnerability stems from the software's insecure handling of mirror updates, where the tool attempts to download supplementary files from remote repositories without proper security validation. The flaw creates an opportunity for attackers to manipulate the update process and potentially execute arbitrary code on systems running vulnerable versions of rkhunter.
The technical implementation of this vulnerability lies in the insecure download mechanisms used during mirror updates. When rkhunter attempts to fetch updates from mirror repositories, it does not validate the integrity of downloaded files or ensure that communications occur over secure channels. This insecure practice allows for man-in-the-middle attacks where malicious actors can intercept and modify the downloaded files before they reach the target system. The vulnerability specifically impacts the update functionality that rkhunter employs to fetch additional signature databases and configuration files from remote sources, creating a pathway for remote code execution through compromised update channels.
The operational impact of this vulnerability extends beyond simple privilege escalation or local code execution, as it fundamentally compromises the security posture of systems relying on rkhunter for integrity monitoring. Attackers exploiting this vulnerability can gain unauthorized access to systems and potentially establish persistent backdoors through the compromised update process. The risk is particularly significant because rkhunter is commonly deployed on servers and workstations where it serves as a critical security monitoring tool, making it an attractive target for attackers seeking to maintain long-term access. Systems that do not regularly update their rkhunter installations remain vulnerable until patched, creating extended attack windows for threat actors.
Mitigation strategies for CVE-2017-7480 require immediate patching of affected rkhunter installations to version 1.4.4 or later, which addresses the insecure download mechanisms through the implementation of secure communication protocols and file integrity validation. Organizations should also implement network monitoring to detect suspicious download activities and establish secure baseline configurations that enforce encrypted communications for all update processes. The vulnerability aligns with CWE-319, which addresses insecure transmission of sensitive information, and maps to ATT&CK technique T1078.004, concerning valid accounts and credential access through compromised system tools. Additional defensive measures include implementing network segmentation to limit update access, deploying intrusion detection systems to monitor for unauthorized file modifications, and establishing robust patch management processes that ensure timely deployment of security updates across all system components.