External risk intelligence

Microsoft Cryptographic Provider Privilege Escalation Vulnerability

CVE advisoryKnown Exploit

CVE-2021-31201

A vulnerability in Microsoft's Enhanced Cryptographic Provider could allow an attacker with local access to gain elevated privileges. This could impact data integrity and confidentiality on affected Windows systems. The U.S. government has identified this as a known exploited vulnerability, suggesting active threat act

1Halo Surface Signal

Microsoft Windows 10 1507

before 10.0.10240.18967before 10.0.14393.4467before 10.0.17763.1999before 10.0.18363.1621before 10.0.19041.1052before 10.0.19042.1052before 10.0.19043.1052r2

External exposure likelihood

Halo Surface Signal score for CVE-2021-31201

The vulnerability affects a local cryptographic provider component within the Windows operating system. It requires local access to the system to exploit, making it fundamentally an internal, host-based issue rather than a service reachable from the public internet.

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability exists within Microsoft's Enhanced Cryptographic Provider. This flaw allows for an elevation of privilege, potentially enabling unauthorized access and modification of data. The impact could affect the confidentiality and integrity of sensitive information and disrupt system operations.

Vulnerable Microsoft cryptographic component
Allows privilege escalation
Impacts data integrity and confidentiality

Attack Path

How an attacker could exploit the issue

This vulnerability affects the Microsoft Enhanced Cryptographic Provider, potentially allowing an attacker to gain elevated privileges on a system. An attacker could leverage this vulnerability to execute code with elevated permissions, impacting the integrity and confidentiality of data. The attack requires a local presence on the affected machine to be successful.

Local access is required.
Attacker triggers a vulnerable function.
Control is escalated.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability impacts Microsoft Windows systems, specifically related to the Enhanced Cryptographic Provider. Attackers with local access could exploit this to gain elevated privileges on a compromised system. The risk associated with this vulnerability has been identified by CISA as a known exploited vulnerability, indicating active threat activity. Organizations should prioritize addressing this to mitigate potential business risk.

Low skill level attacker can exploit.
Requires local system access.
Treat as a high-urgency issue.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

An elevation of privilege vulnerability exists in Microsoft's Enhanced Cryptographic Provider. This vulnerability could allow an attacker with local access to elevate their privileges on an affected system. Organizations should take steps to identify and remediate this issue to mitigate potential business risk.

Find affected systems and software.
Reduce exposure or isolate risk.
Apply vendor fixes and verify.
Monitor for related issues.

Frequently asked questions

What is the Microsoft Enhanced Cryptographic Provider and its role in Windows security?

The Microsoft Enhanced Cryptographic Provider is a core component of the Windows operating system responsible for managing cryptographic operations. It underpins the security of applications and the system by enabling functions such as encrypting and decrypting data, and creating digital signatures, all of which are vital for protecting information and secure communication channels.

What type of weakness does CVE-2021-31201 represent?

CVE-2021-31201 is classified as an elevation of privilege vulnerability. This means that a security flaw exists which could permit an attacker, already possessing limited access to a system, to escalate their permissions and gain higher-level control, such as administrative rights they are not authorized to have.

How can an attacker exploit CVE-2021-31201 and what is the scope of impact?

Exploitation of CVE-2021-31201 requires an attacker to have local access to the affected system. The vulnerability allows an attacker to trigger a vulnerable function within the Enhanced Cryptographic Provider, leading to an escalation of control. The scope is limited to the local system, as it cannot be exploited remotely.

What is the relevance of CVE-2021-31201, and why is it significant?

CVE-2021-31201 is significant because it has been identified by CISA as a known exploited vulnerability, indicating that it is actively being used in real-world attacks. This elevates the urgency for organizations to address the vulnerability to mitigate potential business risks and protect against active threats.

What actions should be taken to address the Microsoft Enhanced Cryptographic Provider vulnerability?

To address this vulnerability, organizations should first identify all systems and software affected by CVE-2021-31201. Implementing vendor-provided fixes and patches is crucial, followed by verification that the remediation has been successful. Continuous monitoring for any related security issues is also recommended.

References

Written by Nicholas Merritt

External-surface CVE analysis and Halo Surface Signal prioritization for Halo Threat Intelligence.