CVE-2023-36847 is classified as a Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on EX Series devices. This vulnerability allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. By sending a specific request to installAppPackage.php, which does not require authentication, an attacker can upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system. This may allow the attacker to chain this vulnerability with other vulnerabilities.
The CVSS score for this vulnerability is 5.3, indicating a medium severity level. This score highlights the importance of addressing the issue promptly, as exploitation could lead to further vulnerabilities being exploited. Organizations that utilize Juniper Networks Junos OS on EX Series should take this vulnerability seriously.
This vulnerability affects several versions of Junos OS, including all versions prior to 20.4R3-S8, and specific versions across 21.x, 22.x, and 23.x series. The urgency for defenders is critical as the potential for exploitation exists, which could lead to significant impacts on their systems.
Organizations should prioritize patching immediately, especially those that are still running affected versions of the software.
Vulnerability Details
The vulnerability allows an attacker to cause limited impact to the file system integrity through unauthenticated access. The CVSS vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N, indicating that the attack vector is network-based, the attack complexity is low, and no privileges or user interaction are required.
The affected product is Juniper Networks Junos OS on EX Series, with specific versions listed above. The vulnerability was published on August 17, 2023, and has been classified under CWE-306.
Technical Analysis
The root cause of the vulnerability is the lack of proper authentication controls for the installAppPackage.php function, allowing unauthorized access. The attack vector is network-based, and the attack complexity is rated as low, meaning that exploitation requires minimal effort on the attacker's part.
No privileges are required to exploit this vulnerability, and no user interaction is needed. The confidentiality impact is none, while the integrity impact is low, meaning that an attacker can manipulate or alter the file system without being detected. The availability impact is also none, which means the system remains operational.
Risk & Impact Analysis
The risk to organizations includes potential unauthorized access to sensitive parts of the file system, which could lead to further exploitation. Given the nature of this vulnerability, organizations that are exposed to the internet are at an increased risk of being targeted by attackers.
The blast radius could be significant, especially if this vulnerability is chained with other vulnerabilities, leading to broader system compromise. The EPSS score of 0.941 indicates a high likelihood of exploitation in the wild, and organizations should take immediate action to mitigate this risk.
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 Juniper Networks Junos OS on EX Series: - All versions prior to 20.4R3-S8 - 21.1 versions 21.1R1 and later - 21.2 versions prior to 21.2R3-S6 - 21.3 versions prior to 21.3R3-S5 - 21.4 versions prior to 21.4R3-S4 - 22.1 versions prior to 22.1R3-S3 - 22.2 versions prior to 22.2R3-S1 - 22.3 versions prior to 22.3R2-S2, 22.3R3 - 22.4 versions prior to 22.4R2-S1, 22.4R3.
Mitigation & Remediation
Organizations should apply mitigations as per vendor instructions immediately. If mitigations are unavailable, discontinuing the use of the product may be necessary. Additionally, implementing strict network controls and monitoring can help prevent exploitation.
For further guidance, organizations may consider engaging in penetration testing to validate the security posture of their systems.
Detection Guidance
Organizations should monitor for any unauthorized file uploads through J-Web and review logs for any unusual access patterns. Behavioral anomalies in file system integrity should also be investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-36847 lies in its potential to be exploited in conjunction with other vulnerabilities, leading to serious consequences. The pattern of vulnerabilities like these highlights the need for organizations to maintain robust security practices. Security teams should take this as a lesson in the importance of secure coding practices and thorough authentication mechanisms.
Organizations are encouraged to assess their current security measures and consider adopting more comprehensive security frameworks, such as engaging in penetration testing methodology to identify and remediate vulnerabilities proactively.
By prioritizing security and staying informed about emerging threats, organizations can better protect themselves against potential attacks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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