CVE-2019-6191 in Paper software
Summary
by MITRE
A potential vulnerability in the discontinued LenovoPaper software version 1.0.0.22 may allow local privilege escalation.
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Analysis
by VulDB Data Team • 02/23/2024
The vulnerability identified as CVE-2019-6191 resides within LenovoPaper software version 1.0.0.22 which was part of Lenovo's suite of productivity applications designed for business users. This particular software component was discontinued, making it a legacy application that may still be present on corporate networks or user systems. The vulnerability manifests as a local privilege escalation flaw that could potentially be exploited by malicious actors who have already gained low-privilege access to a system. This type of vulnerability is particularly concerning because it allows an attacker to elevate their privileges from standard user level to administrative or system-level access, providing them with extensive control over the affected system. The flaw likely stems from improper privilege handling within the software's execution environment or its interaction with the underlying operating system. The vulnerability's impact is significant because it can enable attackers to bypass standard access controls and potentially compromise entire networks if the exploited system has elevated privileges or access to sensitive network resources. The issue represents a classic local privilege escalation vulnerability that aligns with CWE-269, which specifically addresses "Improper Privilege Management" and is often categorized under the broader ATT&CK framework's privilege escalation techniques.
The technical nature of this vulnerability involves a flaw in how LenovoPaper software handles permissions or executes processes with elevated privileges. When the software runs, it likely creates processes or services that operate with higher privileges than necessary for their intended function. The vulnerability allows a local attacker to manipulate the software's execution context or exploit a weakness in its privilege management mechanisms. This could occur through various attack vectors such as manipulating configuration files, exploiting race conditions during software installation or execution, or using buffer overflow techniques that allow privilege elevation. The vulnerability is particularly dangerous because it requires minimal attack surface to exploit, typically only requiring local system access or user-level privileges to initiate the attack. Attackers may leverage this flaw by crafting specific input or manipulating the software's environment to trigger the privilege escalation mechanism. The vulnerability is classified as a local privilege escalation because it cannot be exploited remotely and requires the attacker to already have access to the target system, but once exploited, it can provide full system compromise.
The operational impact of CVE-2019-6191 extends beyond simple system compromise, as it creates a persistent threat vector that can be leveraged for extended network infiltration. Organizations that still maintain legacy LenovoPaper installations face significant risk, particularly in enterprise environments where the software may have been configured to run with elevated privileges or may be used in conjunction with other software components that could be exploited in combination. The vulnerability can enable attackers to establish persistent backdoors, access sensitive corporate data, or use the compromised system as a launch point for further attacks against other network segments. The risk is amplified in environments where multiple users share systems or where the software is configured to run automatically at system startup. Additionally, the discontinued nature of the software means that vendors no longer provide security updates or patches, leaving organizations vulnerable to exploitation by threat actors who may have already identified and weaponized this vulnerability. This situation exemplifies the importance of software lifecycle management and the risks associated with running legacy applications that no longer receive security support.
Mitigation strategies for CVE-2019-6191 must focus on complete removal of the vulnerable LenovoPaper software from affected systems, as no patches are available for this discontinued product. Organizations should conduct comprehensive inventory audits to identify all instances of the software across their network infrastructure and remove it from all systems where it is present. System administrators should also review and tighten privilege management policies to ensure that even if the software remains on a system, it cannot be used to escalate privileges. Network segmentation and access controls should be implemented to limit the potential impact of any successful exploitation attempts. Security monitoring solutions should be configured to detect anomalous behavior that might indicate exploitation attempts or privilege escalation activities. Organizations should also consider implementing application whitelisting policies that prevent unauthorized software from executing on systems, thereby reducing the attack surface. The vulnerability highlights the critical importance of maintaining up-to-date software inventory and the risks associated with legacy software that no longer receives vendor support or security updates. This case demonstrates how discontinued software can create long-term security risks that persist even after the original vendor has stopped supporting the product, emphasizing the need for comprehensive software lifecycle management and regular security assessments.