A flaw was found in rsync. When using the `--safe-links` option, the rsync client fails to properly verify if a symbolic link destination sent from the server contains another symbolic link within it. This results in a path traversal vulnerability, which may lead to arbitrary file write outside the desired directory.
The vulnerability has a CVSS score of 6.5, categorizing it as medium severity. This score indicates that while the risk is not critical, it still presents a significant threat to systems utilizing the affected versions of rsync. Organizations using distributions such as AlmaLinux, Arch Linux, Red Hat, and others should take this vulnerability seriously.
Risk to organizations includes unauthorized system access and potential data loss. Attackers may leverage this vulnerability to manipulate files on the server, impacting the integrity of the system.
Organizations should prioritize patching immediately. No public exploit has been confirmed at this time, but the nature of the vulnerability warrants immediate attention.
Vulnerability Details
The vulnerability in question affects the rsync component across various Linux distributions. The flaw is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory). The issue was published on January 14, 2025, and has since been modified due to further insights into its impact.
The CVSS vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N, indicating that the attack vector is network-based with low complexity and no privileges required for exploitation.
Technical Analysis
The root cause of this vulnerability stems from the rsync client not adequately verifying symbolic links when the `--safe-links` option is enabled. This oversight allows attackers to exploit the path traversal flaw by sending a specially crafted symbolic link that leads to unauthorized file access.
The attack vector is classified as network-based, meaning that an attacker can exploit this vulnerability remotely. The attack complexity is low, as it does not require any specialized knowledge or access. No privileges are needed for exploitation, but user interaction is necessary to trigger the vulnerability.
The vulnerability primarily impacts the integrity of the system, as it allows unauthorized modifications to files. There is no impact on confidentiality or availability.
Risk & Impact Analysis
This vulnerability poses a medium risk to organizations running affected versions of rsync. The potential for unauthorized file writes can lead to significant operational disruptions, data integrity issues, and potential compliance violations.
The blast radius is considerable, as multiple distributions, including AlmaLinux, Red Hat, and others, are affected. Organizations should assess their exposure and prioritize remediation based on their risk tolerance and operational needs.
Given the CVSS score and the potential exploitation, organizations should address this vulnerability in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected products include rsync, various versions of Red Hat's enterprise Linux, and distributions such as AlmaLinux, Arch Linux, and others. All versions prior to vendor patch are at risk.
Mitigation & Remediation
Organizations should ensure they have the latest patches applied to mitigate this vulnerability. If a patch is not available, consider disabling the `--safe-links` option in rsync until a resolution is implemented. Regular system audits and updates are crucial for maintaining security.
For further guidance, organizations can refer to our penetration testing services to assess their security posture.
Detection Guidance
Monitor logs for unusual file access patterns and any modifications to critical system files. Behavioral anomalies may indicate exploitation attempts. Implement network controls to restrict unauthorized access to the rsync service.
AppSecure Threat Intelligence Insight
The significance of this vulnerability lies in its potential exploitation by attackers aiming to compromise systems. It reflects a broader trend of weaknesses in file handling mechanisms in network services. Security teams should remain vigilant and consider enhancing their incident response strategies.
For more insights into proactive security measures, organizations can review our penetration testing methodology and consider implementing a comprehensive vulnerability management program to address similar issues.
Additionally, organizations might find value in exploring our API penetration testing guide to enhance their overall security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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