CVE-2019-5418 is a file content disclosure vulnerability affecting Ruby on Rails. This vulnerability allows specially crafted accept headers to expose the contents of arbitrary files on the target system's filesystem. The severity of this vulnerability has been rated as high, with a CVSS score of 7.5. Organizations leveraging affected versions should address this issue as it poses significant risks to data confidentiality.
The implications of this vulnerability are severe as it can lead to unauthorized access to sensitive information stored on the server. Attackers may leverage this vulnerability to read sensitive files, which can include configurations, credentials, and other confidential data. Consequently, organizations are urged to prioritize patching immediately to mitigate these risks.
As of now, this vulnerability is known to have exploit availability. With a history of being exploited, organizations must take proactive measures to protect their systems. The urgency for defenders is high due to the potential exposure of sensitive information.
Organizations should evaluate their systems for the presence of this vulnerability and apply available patches or mitigations as soon as possible to prevent any adverse impact.
Vulnerability Details
The vulnerability is detailed in the official CVE description stating: "There is a File Content Disclosure vulnerability in Action View <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 and v3 where specially crafted accept headers can cause contents of arbitrary files on the target system's filesystem to be exposed." The vulnerability falls under the CWE classification of CWE-22.
The CVSS score for this vulnerability is 7.5, indicating a high severity. The attack vector is network-based, with a low attack complexity, meaning that no special privileges or user interaction is required for exploitation. The impact on confidentiality is rated as high, while integrity and availability impacts are nonexistent.
Affected products include various versions of Ruby on Rails, specifically versions prior to 5.2.2.1, 5.1.6.2, 5.0.7.2, and 4.2.11.1. The vulnerability was published on March 27, 2019, and has been analyzed for its potential risks.
Technical Analysis
The root cause of this vulnerability lies within the handling of accept headers in the Action View component of Ruby on Rails. By sending specially crafted headers, an attacker can manipulate the application to render and expose files from the server's filesystem. This poses a significant risk, especially when sensitive files are rendered unintentionally.
The attack vector is network-based, which means the attacker does not need physical access to the server. The attack complexity is low due to the absence of required privileges and user interactions. The vulnerability does not impact the integrity or availability of the system, but it allows unauthorized access to confidential information.
Risk & Impact Analysis
Risk to organizations includes the potential exposure of sensitive data due to this vulnerability. The blast radius can be significant, especially for applications that handle sensitive user data or configurations. The high severity rating indicates that organizations should address this vulnerability in their priority patch cycle.
Given the CVSS score of 7.5 and the presence of known exploits, organizations must act swiftly to patch or mitigate this vulnerability. The vulnerability has been added to the KEV catalog, indicating its critical status and urgency for remediation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerability affects the following versions of Ruby on Rails: versions prior to 5.2.2.1, 5.1.6.2, 5.0.7.2, and 4.2.11.1. Organizations using these versions should upgrade to the latest patched versions to mitigate the risk.
Mitigation & Remediation
Organizations should apply the latest patches provided by the vendor immediately. For those unable to update, implementing strict input validation on accept headers could serve as a temporary measure to limit exposure. Additionally, leveraging network controls to restrict access to sensitive files can further mitigate risks. Monitoring logs for unusual access patterns should also be prioritized to detect any potential exploitation attempts.
For further insights on effective security measures, organizations may consider engaging in penetration testing to validate their security posture.
Detection Guidance
Organizations should monitor logs for any access attempts to sensitive files, specifically those that may utilize crafted accept headers. Behavioral anomalies, such as unusual patterns of file access or requests that deviate from typical usage, should also be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2019-5418 reflects a trend in the exploitation of web application vulnerabilities through improper input handling. Organizations must remain vigilant as these types of vulnerabilities can lead to severe data breaches. Security teams should take lessons from this incident to improve their security protocols and ensure that similar vulnerabilities are identified and remediated promptly.
In response to vulnerabilities like CVE-2019-5418, organizations should invest in comprehensive security assessments. Leveraging expert services in application security assessment can help in identifying potential weaknesses before they are exploited.
Lastly, maintaining an updated understanding of the threat landscape through ongoing education and engagement with security communities can empower organizations to proactively defend against emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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