CVE-2019-6693 is classified as a medium-severity vulnerability affecting Fortinet FortiOS. This vulnerability allows the use of a hard-coded cryptographic key to cipher sensitive data in FortiOS configuration backup files. An attacker with access to the backup file could leverage knowledge of the hard-coded key to decipher sensitive data, including users' passwords (except for the administrator's password), private keys' passphrases, and High Availability passwords when set. The implications of this vulnerability are significant, as it poses a risk of unauthorized access to critical information.
The vulnerability has a CVSS score of 6.5, indicating a medium severity level. This score reflects the potential impact on confidentiality, which is rated as high, while integrity and availability impacts are rated as none. Given that the attack vector is network-based with low complexity and requires low privileges, organizations utilizing FortiOS are advised to prioritize remediation efforts.
With the vulnerability being listed in the Known Exploited Vulnerabilities (KEV) catalog, organizations should address this issue promptly. The urgency for defenders is heightened, as attackers may leverage this vulnerability to gain unauthorized access to sensitive data stored in backup files.
Organizations should prioritize patching immediately to mitigate the risk associated with this vulnerability. Understanding the details and implications of CVE-2019-6693 is critical for maintaining the security posture of systems running Fortinet FortiOS.
Vulnerability Details
The official CVE description states that the vulnerability involves the use of a hard-coded cryptographic key. This allows an attacker with access to the FortiOS configuration backup file to decipher sensitive data. The specific details of the vulnerability highlight that it affects user passwords, private keys, and High Availability passwords. The vulnerability is classified under CWE-798, indicating the use of hard-coded credentials.
The CVSS version 3.1 score assigned is 6.5, with a vector string indicating a network attack vector, low attack complexity, low privileges required, and no user interaction needed. The confidentiality impact is rated as high, emphasizing the seriousness of the risk presented by this vulnerability.
The vulnerability affects FortiOS versions prior to vendor patching, specifically versions up to 5.6.10 and 6.0.0 to 6.0.6. The existence of this vulnerability highlights the importance of maintaining secure configurations and regularly updating software to mitigate potential risks.
Technical Analysis
The root cause of this vulnerability is the hard-coded cryptographic key utilized in FortiOS for encrypting sensitive data. This design flaw allows unauthorized users to decrypt sensitive information if they can access the backup files. The attack vector is network-based, requiring low complexity and low privileges to exploit. Importantly, no user interaction is necessary for an attacker to take advantage of this vulnerability.
In terms of impact, the vulnerability significantly affects confidentiality, as sensitive user data can be decrypted without proper authorization. The integrity and availability of the data remain unaffected, which means while the data can be accessed, it cannot be altered or destroyed through this vulnerability.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2019-6693 is significant. Organizations using FortiOS are potentially exposing sensitive user information due to the flawed implementation of cryptographic practices. Given the high confidentiality impact, any successful exploitation could lead to unauthorized access to user credentials and sensitive operational data.
The blast radius of this vulnerability extends to all users of affected FortiOS versions, significantly increasing the risk of data breaches. As the vulnerability is actively exploited in the wild, the urgency for organizations to patch is critical. The CVSS score of 6.5 indicates that this vulnerability should be addressed in the priority patch cycle due to the implications for organizational security.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | Yes |
Affected Versions
FortiOS versions vulnerable to CVE-2019-6693 include all versions prior to vendor patch, specifically versions up to 5.6.10, and from 6.0.0 to 6.0.6. Additionally, version 6.2.0 is also affected. Organizations must ensure that their systems are updated to mitigate the risks associated with this vulnerability.
Mitigation & Remediation
To mitigate the risks associated with CVE-2019-6693, organizations should apply the vendor's recommended patches and updates. Following the guidance outlined in the vendor advisory is essential. If immediate patching is not feasible, organizations should implement additional security measures to limit access to the configuration backup files.
Organizations are encouraged to validate remediation effectiveness through penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor logs for indicators of unauthorized access attempts, particularly those targeting FortiOS backup files. Behavioral anomalies related to user access patterns should also be investigated, along with network signatures that may indicate exploitation attempts. Keeping a close watch on system changes can help detect potential exploitation of this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2019-6693 lies in the implications for cryptographic practices within Fortinet products. The use of hard-coded keys is a critical flaw that needs addressing not only for FortiOS but also for other products that may exhibit similar vulnerabilities.
This vulnerability reflects a broader trend within the industry where security practices must evolve to eliminate hard-coded credentials. Security teams should take this incident as a lesson to enforce better security configurations and conduct regular audits to identify potential weaknesses.
Strategically, organizations should incorporate robust security measures and continuous monitoring to prevent similar vulnerabilities from being exploited in the future. Implementing a comprehensive security framework can help mitigate the risks associated with vulnerabilities like CVE-2019-6693.
For more insights, refer to our articles on penetration testing methodology and vulnerability management program design for improved security strategies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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