CVE-2020-7604 in pulverizr
Summary
by MITRE
pulverizr through 0.7.0 allows execution of arbitrary commands. Within "lib/job.js", the variable "filename" can be controlled by the attacker. This function uses the variable "filename" to construct the argument of the exec call without any sanitization. In order to successfully exploit this vulnerability, an attacker will need to create a new file with the same name as the attack command.
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Analysis
by VulDB Data Team • 04/16/2024
The vulnerability identified as CVE-2020-7604 resides within the pulverizr library version 0.7.0 and earlier, representing a critical command injection flaw that enables remote attackers to execute arbitrary system commands. This vulnerability manifests in the lib/job.js file where the filename variable is directly incorporated into an exec function call without any input sanitization or validation measures. The flaw constitutes a classic command injection vulnerability that falls under the CWE-78 weakness category, specifically addressing improper neutralization of special elements used in OS commands.
The technical exploitation of this vulnerability requires an attacker to leverage the filename variable which is under their control, allowing them to construct malicious command sequences that get executed by the system. The attacker must create a file with the same name as their intended command, effectively bypassing normal execution paths and enabling arbitrary code execution on the target system. This type of vulnerability demonstrates a fundamental lack of input validation and proper command construction practices, creating a direct pathway for privilege escalation and system compromise.
From an operational perspective, this vulnerability poses significant risks to systems utilizing the pulverizr library, particularly in environments where user input is processed through this component. The impact extends beyond simple command execution to potential full system compromise, data exfiltration, and lateral movement within networked environments. The vulnerability's exploitation does not require elevated privileges initially, making it particularly dangerous as it can be leveraged by attackers to gain unauthorized access to sensitive system resources.
Security practitioners should implement immediate mitigations including updating to version 0.7.1 or later of the pulverizr library, which contains the necessary patches to address this vulnerability. Additionally, input validation and sanitization measures should be enforced at all points where external input is processed, particularly when constructing system commands. The ATT&CK framework categorizes this vulnerability under T1059.001 - Command and Scripting Interpreter, specifically PowerShell and Command Shell, highlighting the operational security implications of such flaws. Organizations should also consider implementing network segmentation, monitoring for unusual command execution patterns, and conducting thorough code reviews to identify similar vulnerabilities in other components of their software stack.