CVE-2021-27964 is identified as a critical vulnerability affecting SonLogger versions prior to 6.4.1. This vulnerability allows unauthenticated arbitrary file upload, which can lead to severe security risks. Specifically, an attacker can send a POST request to /Config/SaveUploadedHotspotLogoFile without requiring any authentication or session header. This lack of authentication creates an opportunity for malicious actors to upload potentially harmful files.
The CVSS score for this vulnerability is 9.8, indicating a critical severity level. This score reflects the high impact on confidentiality, integrity, and availability, as there are no restrictions on the file upload process. Attackers may leverage this vulnerability to upload and execute arbitrary files, leading to unauthorized access and potential system compromise.
Given the ease of exploitation and the critical nature of this vulnerability, organizations utilizing SonLogger must prioritize patching to version 6.4.1 or later immediately. Failure to address this vulnerability could result in significant security incidents.
To summarize, organizations should recognize the urgency of addressing CVE-2021-27964 due to its high potential for exploitation and the severe implications for security.
Vulnerability Details
The official description of this vulnerability states that SonLogger before version 6.4.1 is affected by unauthenticated arbitrary file upload. The vulnerability falls under CWE-434, which pertains to the upload of files with dangerous extensions and no validation. The vulnerability was published on March 5, 2021, and has since been modified.
The CVSS 3.1 vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating a critical risk due to the network attack vector, low complexity, and no privileges required for exploitation.
Affected products include SonLogger, and the vendor involved is sfcyazilim. The vulnerability's impact can significantly affect confidentiality, integrity, and availability, making it imperative for organizations to take immediate action.
Technical Analysis
The root cause of CVE-2021-27964 lies in the absence of authentication checks in the file upload functionality of SonLogger. The attack vector is through the network, allowing remote attackers to exploit this vulnerability without any user interaction required. The attack complexity is low, meaning that it can be executed easily by an attacker without advanced skills.
Since no privileges are required to exploit this vulnerability, it poses a significant risk to any organization running vulnerable versions of SonLogger. The potential impacts on confidentiality, integrity, and availability are high, as attackers can upload arbitrary files, which may include malicious scripts or executables.
Risk & Impact Analysis
Risk to organizations includes unauthorized access and potential takeover of systems where SonLogger is deployed. Given the critical nature of the vulnerability, the blast radius could extend to any connected systems or networks, leading to widespread disruption.
Organizations should assess their exposure to this vulnerability and prioritize its remediation. The urgency is classified as critical due to the high CVSS score and the potential for active exploitation in the wild.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of SonLogger prior to 6.4.1 are affected by this vulnerability. Organizations utilizing any version below 6.4.1 should take immediate actions to upgrade their systems.
Mitigation & Remediation
Organizations must upgrade to SonLogger version 6.4.1 or later to mitigate this vulnerability. If immediate upgrading is not feasible, organizations should implement strict input validation on file uploads and limit file types that can be uploaded to mitigate potential risks.
Additionally, organizations should consider implementing network controls and continuous monitoring to detect any unauthorized access attempts. For further guidance on effective security practices, organizations may refer to the penetration testing services offered by AppSecure.
Detection Guidance
Organizations should monitor logs for unusual file upload activities, particularly to the /Config/SaveUploadedHotspotLogoFile endpoint. Behavioral anomalies such as unexpected file types or file sizes should also be flagged. Implementing network signature detection can help identify attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-27964 highlights the necessity for robust input validation mechanisms in file upload functionalities. This vulnerability exemplifies common patterns in software weaknesses, where inadequate validation can lead to severe security breaches.
Security teams should take this incident as a lesson to implement comprehensive testing and validation mechanisms. For further insights on security practices, refer to our web application penetration testing methodologies and strategies.
Further, organizations must continuously evaluate their security posture against evolving threats, ensuring that their applications are resilient to such vulnerabilities. For guidance on securing applications, consider our vulnerability management program design strategies.
In conclusion, organizations should recognize the critical nature of CVE-2021-27964 and act decisively to remediate its effects.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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