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JumpCloud Remote Assist for Windows versions prior to 0.317.0 ship an uninstaller that is executed by the JumpCloud Windows Agent with NT AUTHORITY\SYSTEM privileges during agent uninstall/update flows. The uninstaller performs privileged create/write/execute/delete operations on predictable files within a user-writable %TEMP% subdirectory (e.g., a ~nsuA.tmp-style directory) without validating that the directory is trusted and without resetting/locking down ACLs when the directory already exists. A low-privileged local attacker can pre-create the target temp directory with permissive ACLs and then use mount-point/Object Manager namespace redirection or symbolic links to redirect these privileged file operations to attacker-chosen targets. This enables arbitrary file writes to protected locations (potentially causing denial of service by overwriting sensitive system files) and can also enable arbitrary file/folder deletion and local privilege escalation to SYSTEM via link/race manipulation of deletion routines (e.g., DeleteFileW()).
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No public exploit code observed for this vulnerability.
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A vulnerability in JumpCloud Agent. No further details provided in the content.
A local privilege escalation vulnerability in JumpCloud Remote Assist for Windows, allowing low-privileged users to gain SYSTEM privileges via insecure file operations during uninstall.
A critical local privilege escalation vulnerability in JumpCloud Remote Assist for Windows agent, allowing attackers with local access to gain SYSTEM privileges or cause denial-of-service by exploiting unsafe file operations during uninstall or update routines.
A critical local privilege escalation vulnerability in the JumpCloud Remote Assist for Windows agent allows a low-privileged user to gain SYSTEM-level access by exploiting the agent's uninstallation process, which performs privileged file operations in a user-controlled directory. This can lead to full persistent control over the endpoint or denial of service.
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Cross-references every affected SKU, including bundled OEM variants.
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