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"Vulnerability: Lenovo System Updater Local Privilege Escalation via Arbitrary File Write"

"Advisory: https://support.lenovo.com/us/en/product_security/LEN-135367"

"The Lenovo System Update application is designed to allow non-administrators to check for and apply updates to their workstation. During the process of checking for updates, the privileged Lenovo Update application attempts to utilize C:\SSClientCommon\HelloLevel_9_58_00.xml, which doesn’t exist on the filesystem. Due to the ability for any low-privileged user to create a directory in the root of the C:\ drive, it’s possible to provide the privileged Lenovo System Update application a specially crafted HelloLevel_9_58_00.xml file, which is located in C:\SSClientCommon. This custom XML file contains a source and destination file path, which the Lenovo System Update application parses when the user checks for updates. Once parsed, the privileged Lenovo System Update application moves the source file to the destination location and allows for an arbitrary file write primitive, thus resulting in elevation of privilege to NT AUTHORITY\SYSTEM."

"When a user checks for Lenovo updates via the Lenovo System Update application, Tvsukernel.exe is launched as the user Lenovo_tmp_<randomCharacters> in a privileged, High Integrity context. Upon execution, Tvsukernel.exe checks for HelloLevel_9_58_00.xml in C:\SSClientCommon, shown below in Figure 01."

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Authority Metrics: Score 57/100

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