CVE-2021-20049 is a high-severity vulnerability that affects SonicWall's SMA100 password change API. This vulnerability allows a remote unauthenticated attacker to perform SMA100 username enumeration based on the server responses. The impact of this vulnerability is severe, as it exposes user information that can be leveraged in further attacks.
With a CVSS score of 7.5, organizations should prioritize patching immediately. The affected versions include 10.2.1.2-24sv, 10.2.0.8-37sv, and earlier 10.x versions. The vulnerability was published on December 23, 2021, and has been classified under CWE-203 and CWE-204.
Risk to organizations includes potential unauthorized access to sensitive information as attackers could enumerate valid usernames, which could lead to credential stuffing or targeted phishing attacks. It is crucial for organizations operating SonicWall devices to assess their exposure and implement mitigations without delay.
According to the latest threat intelligence, this vulnerability does not have a known exploit and is not listed in the Known Exploited Vulnerabilities (KEV) catalog. However, organizations should remain vigilant and monitor for any emerging threats associated with this vulnerability.
Vulnerability Details
The official description states that the vulnerability allows a remote unauthenticated attacker to perform username enumeration through the SMA100 password change API. The affected systems include various versions of the SMA firmware from SonicWall, with a focus on the following specific versions: 10.2.1.2-24sv and 10.2.0.8-37sv.
The vulnerability is classified as a high severity due to its potential impact on confidentiality, with a CVSS score of 7.5. The attack vector is network-based, requiring no privileges or user interaction, making it particularly concerning for organizations.
The vulnerability was disclosed on December 23, 2021, and reflects a significant risk for organizations that may be using affected versions of SonicWall products.
Technical Analysis
The root cause of this vulnerability lies in the design of the password change API, which fails to adequately protect against username enumeration attacks. Attackers can exploit this weakness by sending crafted requests to the API and analyzing the responses to determine valid usernames.
The attack vector is network-based, allowing attackers to execute the enumeration remotely without any required privileges. The complexity of the attack is low, and no user interaction is necessary, which increases the risk to organizations.
The impact on confidentiality is high, as successful enumeration can lead to the exposure of sensitive user information. The vulnerability does not affect integrity or availability, but the potential for data breaches remains a significant concern.
Risk & Impact Analysis
Organizations using affected versions of SonicWall's SMA100 products face a considerable risk due to this vulnerability. The ability for attackers to enumerate valid usernames could facilitate further attacks, such as credential stuffing or targeted phishing.
The urgency for organizations to respond is heightened by the high CVSS score of 7.5, indicating significant potential impact. While the vulnerability is not actively exploited according to current intelligence, the possibility remains that attackers may develop methods to leverage this weakness.
Organizations should address this vulnerability in their priority patch cycle to mitigate risks associated with potential unauthorized access or data breaches.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of SonicWall SMA firmware include:
10.2.1.2-24sv, 10.2.0.8-37sv, and earlier 10.x versions. Organizations are advised to upgrade to the latest version to mitigate this vulnerability.
Mitigation & Remediation
Organizations should prioritize the following actions to mitigate this vulnerability:
1. Upgrade to the latest firmware version provided by SonicWall to address this vulnerability.
2. Implement network segmentation to limit access to the SMA100 and reduce exposure.
3. Conduct regular security assessments to identify potential vulnerabilities within the environment.
4. Consider engaging in penetration testing services to validate the effectiveness of remediation efforts.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor for the following indicators:
1. Log entries from the SMA100 API that show unusual patterns of access attempts, particularly those targeting the password change endpoint.
2. Behavioral anomalies indicating enumeration attempts, such as repeated requests for similar usernames.
3. Network signatures that could indicate scanning or probing behavior directed at the SMA100.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-20049 highlights the need for robust security practices surrounding API management. Organizations must adopt a proactive approach to security, ensuring that their systems are resilient against enumeration attacks.
This vulnerability serves as a reminder of the potential risks associated with inadequate access controls and API design flaws. Security teams should learn from such incidents to enhance their defensive strategies and implement strict validation measures.
For further reading on securing APIs, organizations can refer to the API security best practices and the importance of rigorous testing procedures.
Additionally, examining trends in API vulnerabilities can provide insights into common attack vectors, helping organizations stay ahead of emerging threats. Engaging in continuous education and awareness programs will strengthen the security posture of any organization.
Organizations should also consider periodic reviews of their security frameworks and incident response plans to ensure they are equipped to handle vulnerabilities like CVE-2021-20049 effectively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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