CVE-2015-2219 in System Update
Summary
by MITRE
Lenovo System Update (formerly ThinkVantage System Update) before 5.06.0034 uses predictable security tokens, which allows local users to gain privileges by sending a valid token with a command to the System Update service (SUService.exe) through an unspecified named pipe.
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Analysis
by VulDB Data Team • 06/08/2025
The vulnerability identified as CVE-2015-2219 affects Lenovo System Update software, formerly known as ThinkVantage System Update, specifically versions prior to 5.06.0034. This issue represents a significant security weakness in the privilege escalation mechanism of the system update service, creating a pathway for local attackers to elevate their system privileges without proper authentication. The vulnerability stems from the predictable nature of security tokens used by the SUService.exe process, which operates as a background service responsible for managing system updates and driver installations on Lenovo devices.
The technical flaw lies in the implementation of security token generation within the System Update service, where the tokens used for authentication purposes follow predictable patterns rather than employing cryptographically secure randomization. This predictable token generation allows local users to forge valid authentication tokens that can be used to communicate with the SUService.exe process through an unnamed pipe mechanism. The vulnerability specifically targets the communication channel between the malicious local user and the privileged system service, enabling unauthorized privilege escalation through legitimate system interfaces that should require proper authentication.
From an operational perspective, this vulnerability poses a serious threat to system security as it allows any local user to potentially gain administrative privileges on affected Lenovo systems. The attack vector is particularly concerning because it requires no network connectivity or external exploitation, relying solely on local system access and knowledge of the predictable token generation algorithm. Once successfully exploited, the attacker could install malicious software, modify system configurations, access sensitive data, or disable security controls, effectively compromising the entire system. The impact extends beyond individual systems to potentially affect enterprise environments where multiple Lenovo devices may be running vulnerable versions of the software.
The vulnerability aligns with CWE-330, which addresses the use of insecure random number generators, and represents a classic example of weak authentication mechanisms in privileged services. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques, specifically leveraging service execution and process injection methods. The predictable token generation directly relates to the technique of credential access through token manipulation, where attackers exploit weaknesses in authentication protocols to gain elevated privileges. Organizations should implement immediate patch management procedures to upgrade to Lenovo System Update version 5.06.0034 or later, which addresses the token generation predictability issue. Additionally, system administrators should monitor for unauthorized access to the SUService.exe process and consider implementing additional access controls or service hardening measures to limit the attack surface of privileged system components.