CVE-2020-1249 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows Runtime improperly handles objects in memory, aka 'Windows Runtime Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1353, CVE-2020-1370, CVE-2020-1399, CVE-2020-1404, CVE-2020-1413, CVE-2020-1414, CVE-2020-1415, CVE-2020-1422.
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Analysis
by VulDB Data Team • 10/30/2020
The Windows Runtime elevation of privilege vulnerability identified as CVE-2020-1249 represents a critical security flaw within the Windows operating system's runtime environment that allows attackers to escalate their privileges from standard user level to administrative rights. This vulnerability specifically manifests when the Windows Runtime component fails to properly handle objects in memory, creating exploitable conditions that can be leveraged by malicious actors to gain unauthorized access to system resources. The flaw resides in the underlying memory management mechanisms that govern how Windows Runtime objects are allocated, utilized, and subsequently deallocated within the system's memory space. This particular vulnerability is distinct from several other contemporaneous issues affecting Windows systems, including CVE-2020-1353 through CVE-2020-1422, each representing separate attack vectors targeting different components of the Windows ecosystem. The vulnerability's classification aligns with CWE-264, which addresses permissions, privileges, and access controls within software systems, specifically focusing on improper handling of memory objects that could lead to privilege escalation.
The technical exploitation of this vulnerability typically involves crafting malicious code or applications that manipulate Windows Runtime objects in ways that trigger the improper memory handling behavior. Attackers can leverage this flaw by creating specific memory patterns or object states that cause the Windows Runtime to execute code with elevated privileges, effectively bypassing normal security boundaries that separate user applications from system-level processes. The memory handling error occurs during the object lifecycle management within the Windows Runtime, where objects may be improperly validated, initialized, or cleaned up, leading to situations where attacker-controlled data can influence system behavior. This particular weakness creates a pathway for privilege escalation because the Windows Runtime component, which is designed to provide secure application execution environments, fails to properly enforce security boundaries when processing memory objects. The vulnerability can be exploited through various attack vectors including malicious applications, compromised software installations, or even through sophisticated social engineering campaigns that trick users into executing harmful code that specifically targets this memory handling flaw.
The operational impact of CVE-2020-1249 extends beyond simple privilege escalation to encompass potential system compromise and data breaches across affected Windows environments. When successfully exploited, this vulnerability allows attackers to execute arbitrary code with system-level privileges, providing them with complete control over affected systems. The implications include unauthorized access to sensitive data, installation of persistent malware, modification of system files, and establishment of backdoors that can maintain long-term access to compromised networks. Organizations running affected Windows versions become vulnerable to advanced persistent threats where attackers can move laterally through networks, escalate privileges across multiple systems, and access critical infrastructure resources. The vulnerability's presence in Windows Runtime components means that any application or service relying on these runtime environments could potentially serve as an attack vector, making the impact widespread across enterprise environments where multiple applications depend on the same underlying runtime infrastructure. This vulnerability directly maps to ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation', and T1059, covering 'Command and Scripting Interpreter', as attackers can leverage the elevated privileges to execute additional malicious activities and maintain persistence.
Mitigation strategies for CVE-2020-1249 focus primarily on applying Microsoft security patches and updates that address the specific memory handling issues within Windows Runtime components. Organizations should prioritize immediate deployment of the relevant security updates from Microsoft's Windows Update service, as these patches specifically target the memory management flaws that enable privilege escalation. System administrators should implement comprehensive patch management processes that ensure all Windows systems receive security updates promptly, particularly given the high severity classification of this vulnerability. Additional mitigations include implementing application whitelisting policies that restrict execution of unauthorized applications, enabling Windows Defender Application Control to prevent execution of malicious code, and deploying network monitoring solutions to detect anomalous privilege escalation activities. Security teams should also consider implementing least privilege principles, ensuring that user accounts operate with minimal necessary permissions to reduce the potential impact of successful exploitation. The vulnerability's nature makes it particularly suitable for automated exploitation, so organizations should also strengthen their endpoint detection and response capabilities to identify and block malicious activities that attempt to leverage this flaw. Regular security assessments and vulnerability scanning should be conducted to identify systems that may not have received the necessary patches, as failure to apply the security updates leaves systems exposed to exploitation by threat actors who actively target this vulnerability.