CVE-2017-16674 in Windows Agent
Summary
by MITRE
Datto Windows Agent allows unauthenticated remote command execution via a modified command in conjunction with CVE-2017-16673 exploitation, aka an attack with a malformed primary whitelisted command and a secondary non-whitelisted command. This affects Datto Windows Agent (DWA) 1.0.5.0 and earlier. In other words, an attacker could combine this "primary/secondary" attack with the CVE-2017-16673 "rogue pairing" attack to achieve unauthenticated access to all agent machines running these older DWA versions.
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Analysis
by VulDB Data Team • 12/05/2019
The vulnerability identified as CVE-2017-16674 represents a critical security flaw in the Datto Windows Agent software that enables unauthenticated remote command execution. This weakness specifically affects versions 1.0.5.0 and earlier of the Datto Windows Agent, creating a significant attack surface that could be exploited by malicious actors to gain unauthorized access to affected systems. The vulnerability operates through a sophisticated two-stage attack methodology that leverages the combination of multiple exploitation techniques to bypass security controls that would otherwise prevent unauthorized access.
The technical implementation of this vulnerability involves a complex interplay between two separate but complementary security flaws. The primary mechanism relies on exploiting CVE-2017-16673, which allows for a "rogue pairing" attack that manipulates the agent's command processing behavior. This initial exploitation creates a foothold by modifying how the system handles whitelisted commands. The secondary component involves crafting a malformed primary whitelisted command that, when combined with a subsequent non-whitelisted command, effectively bypasses the agent's security controls. This attack pattern demonstrates a sophisticated understanding of how command validation and execution flows can be manipulated to create unintended access paths.
From an operational perspective, this vulnerability presents a severe risk to organizations that rely on Datto Windows Agent for backup and recovery operations. The unauthenticated nature of the attack means that no valid credentials are required to exploit the vulnerability, making it particularly dangerous in environments where network security controls may not be sufficient to prevent lateral movement. The attack chain allows for complete compromise of affected systems, potentially enabling attackers to execute arbitrary commands, access sensitive data, and establish persistent access to the compromised infrastructure. This vulnerability directly impacts the integrity and confidentiality of backup systems that are often considered critical components of enterprise security infrastructure.
The security implications extend beyond simple command execution to encompass broader system compromise capabilities. Attackers leveraging this vulnerability could potentially escalate privileges, install malware, modify backup configurations, or access data that should be protected by the agent's security controls. The combination of these two vulnerabilities creates a particularly dangerous attack vector that exploits weaknesses in the agent's command validation and execution mechanisms. This type of attack pattern aligns with techniques described in the ATT&CK framework under the command and control and privilege escalation domains, where adversaries seek to establish persistent access through application exploitation.
Organizations affected by this vulnerability should immediately implement mitigation strategies including upgrading to patched versions of the Datto Windows Agent software, implementing network segmentation to limit access to affected systems, and conducting thorough security assessments to identify any potential exploitation that may have occurred. The vulnerability also highlights the importance of proper input validation and command execution controls in security software, as outlined in CWE categories related to improper input validation and command injection. System administrators should also consider implementing monitoring solutions that can detect anomalous command execution patterns that might indicate exploitation attempts, particularly focusing on unusual combinations of whitelisted and non-whitelisted command sequences that could indicate this specific attack pattern.