CVE-2022-35834 in Windows
Summary
by MITRE • 09/13/2022
Microsoft OLE DB Provider for SQL Server Remote Code Execution Vulnerability. This CVE ID is unique from CVE-2022-34731, CVE-2022-34733, CVE-2022-35835, CVE-2022-35836, CVE-2022-35840.
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Analysis
by VulDB Data Team • 10/16/2022
The Microsoft OLE DB Provider for SQL Server remote code execution vulnerability represents a critical security flaw that enables attackers to execute arbitrary code on affected systems through specially crafted database connections. This vulnerability specifically affects the OLE DB provider component that facilitates communication between applications and sql server databases, making it a significant concern for enterprise environments that rely heavily on database connectivity. The flaw exists within the provider's handling of certain connection parameters and data processing routines, creating an attack surface that can be exploited by remote threat actors without requiring authentication credentials.
The technical implementation of this vulnerability stems from improper input validation and memory handling within the OLE DB provider's connection string parsing mechanisms. When processing maliciously crafted connection strings or database queries, the provider fails to properly validate user-supplied data, leading to buffer overflows or memory corruption conditions that can be leveraged to inject and execute malicious code. This type of vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-787, which addresses out-of-bounds write vulnerabilities. The attack vector typically involves establishing a connection to a sql server instance using a specially crafted connection string that triggers the vulnerable code path within the provider component.
The operational impact of CVE-2022-35834 extends beyond simple remote code execution to encompass potential data breaches, system compromise, and lateral movement within network environments. Organizations utilizing the affected OLE DB provider components face significant risk of unauthorized access to sensitive database information, particularly when applications use connection strings that may be manipulated by attackers. The vulnerability can be exploited across various attack scenarios including web application exploitation, database server compromise, and man-in-the-middle attacks against database communications. This vulnerability directly maps to attack techniques described in the mitre att&ck framework under tactic TA0006 (credential access) and technique T1071.004 (application layer protocol: dns), as attackers can leverage the compromised provider to establish persistent access and exfiltrate data.
Mitigation strategies for this vulnerability should prioritize immediate patch deployment through microsoft's security updates, which address the underlying memory handling and input validation issues within the OLE DB provider. Organizations should implement network segmentation to limit access to sql server instances and restrict the ability of attackers to reach vulnerable components. Additional protective measures include monitoring for unusual database connection patterns, implementing strict connection string validation within applications, and deploying intrusion detection systems that can identify exploitation attempts. The vulnerability's classification as a remote code execution flaw necessitates comprehensive network monitoring and endpoint detection capabilities to identify potential exploitation attempts. Organizations should also consider implementing application whitelisting policies to restrict which applications can establish database connections and perform the specific operations that trigger the vulnerable code paths. Regular security assessments and vulnerability scanning should be conducted to identify any remaining instances of the vulnerable provider components within the environment, as the attack surface may extend beyond directly exposed sql servers to include applications that utilize the OLE DB provider for database connectivity.