CVE-2020-7826 in BflyInstallerX.ocx
Summary
by MITRE
EyeSurfer BflyInstallerX.ocx v1.0.0.16 and earlier versions contain a vulnerability that could allow remote files to be download by setting the arguments to the vulnerable method. This can be leveraged for code execution. When the vulnerable method is called, they fail to properly check the parameters that are passed to it.
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Analysis
by VulDB Data Team • 11/04/2020
The vulnerability identified as CVE-2020-7826 affects EyeSurfer BflyInstallerX.ocx ActiveX control version 1.0.0.16 and earlier, representing a critical security flaw that enables remote code execution through improper parameter validation. This vulnerability resides within the control's method implementation where input parameters are not adequately validated before processing, creating an exploitable condition that can be leveraged by malicious actors to download and execute arbitrary files on affected systems. The flaw specifically manifests when the vulnerable method is invoked with crafted arguments that bypass normal validation checks, allowing attackers to manipulate the control's behavior and potentially gain unauthorized access to the target system.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic example of insecure parameter handling within ActiveX controls. The vulnerability operates through a method call that fails to sanitize or validate the arguments passed to it, creating a path for attackers to inject malicious parameters that trigger unintended behavior. When the vulnerable method processes these unvalidated inputs, it can interpret them as commands to download files from remote servers and execute them locally, effectively providing attackers with a mechanism to deploy malware or establish persistent access to compromised systems. This type of vulnerability is particularly dangerous because ActiveX controls are commonly executed with elevated privileges in web browsers, amplifying the potential impact of exploitation.
The operational impact of CVE-2020-7826 extends beyond simple remote code execution, as it can be leveraged as a stepping stone for more sophisticated attacks within compromised environments. Attackers can use this vulnerability to download additional malicious payloads, establish backdoors, or perform lateral movement within networks where affected systems exist. The vulnerability's remote exploitation capability means that attackers do not require local access to the target system, making it particularly attractive for large-scale attacks against organizations with web-facing applications that may be using the vulnerable ActiveX control. Additionally, since ActiveX controls are often deployed in enterprise environments for legitimate purposes, the presence of this vulnerability can go undetected for extended periods, allowing attackers to maintain persistent access and conduct extended reconnaissance activities.
Organizations should implement immediate mitigations including the removal or disabling of the vulnerable BflyInstallerX.ocx control from affected systems, particularly in environments where ActiveX controls are not essential for business operations. The recommended approach involves updating to the latest version of the EyeSurfer software that addresses this vulnerability, as well as implementing browser security policies that restrict ActiveX control execution or disable ActiveX altogether in web browsers. Network-level protections should include monitoring for suspicious file download activities and implementing application whitelisting policies to prevent execution of unauthorized binaries. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1195.001 (Phishing: Spearphishing Attachment) and T1059.001 (Command and Scripting Interpreter: PowerShell) as attackers may use the vulnerability to deploy initial payloads or establish command and control channels. Security teams should also consider implementing endpoint detection and response solutions that can identify anomalous behavior patterns associated with ActiveX control exploitation, particularly around file download activities and process creation events that may indicate exploitation attempts.