Severity: HIGH
Description: Azure SDK for C Security Feature Bypass Vulnerability
CVSS Score: 7.4
B
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1. Risk Assessment
CVE-2020-17002 represents a security feature bypass vulnerability within the Azure SDK for C. The vulnerability allows for potential elevation of privilege, meaning an attacker could gain higher-level access than intended. The CVSS score of 7.4 (HIGH) indicates a significant risk. The vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C) reveals the vulnerability is network accessible, requires high complexity to exploit, needs no privileges, and doesn’t require user interaction. This suggests a potentially widespread impact, though successful exploitation isn't trivial. The vulnerability impacts confidentiality and integrity, as an attacker could potentially read sensitive data and modify system state. Availability isn’t directly impacted, but could be affected as a secondary consequence of a successful exploit. The EPSS score of 0.061860000 suggests a moderate probability of exploitation in the wild, though this is dependent on the specific deployment and usage of the affected Azure SDK components. The numerous affected components, including azure-c-shared-utility, azure-uamqp-c, and the C SDK for Azure IoT, increase the potential attack surface.
2. Potential Attack Scenarios
An attacker leveraging CVE-2020-17002 could target an application utilizing the affected Azure SDK for C. The attack vector would be network-based, meaning the attacker doesn’t need local access to the system. The process begins with the attacker sending crafted network requests to the application, designed to exploit the security feature bypass. Specifically, the attacker could potentially manipulate how the Azure SDK validates input or handles authentication, allowing them to gain access to resources they shouldn’t normally have. This could lead to data exfiltration, modification of application state, or even control over the underlying system. For example, an application using Azure IoT Hub could be compromised, allowing an attacker to remotely control connected devices. The outcome could range from a minor data leak to a full-scale compromise of the application and its associated data.
3. Mitigation Recommendations
The primary mitigation for CVE-2020-17002 is to update the affected Azure SDK for C components to the latest version. Microsoft has released updates that address the security feature bypass. Developers should prioritize patching applications using the following components: azure-c-shared-utility, azure-uamqp-c, azure-umqtt-c, azure-uhttp-c, azure-utpm-c, and the C SDK for Azure IoT. Ensure thorough testing after patching to confirm functionality remains as expected. Regularly monitor Microsoft’s security update guide for further updates and guidance: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17002. Implementing robust input validation within the application itself can provide an additional layer of defense, even after patching. Consider using a vulnerability scanner to identify instances of the affected SDKs in your environment.
4. Executive Summary
CVE-2020-17002 is a HIGH severity security vulnerability affecting multiple components of the Azure SDK for C. This vulnerability allows attackers to bypass security features, potentially leading to elevation of privilege and compromising the confidentiality and integrity of data. While exploitation requires some complexity, the network-accessible nature of the vulnerability means it can be exploited remotely. Updating the affected Azure SDK components is the primary mitigation, and should be prioritized to minimize risk. Failure to address this vulnerability could result in data breaches, compromised application functionality, and potential disruption of business operations. Prompt action is recommended to protect your Azure-based applications and data.