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Legion Y520t Z370 FirmwareOperating system · Lenovo

CVE-2019-10724

MEDIUM · 6.5 CVSS v3.0 Published 2019-08-29
Fix available
A fix is available. Upgrade to 6.0.1.8642 or later.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
There is a vulnerability with the Dolby DAX2 API system services in which a low-privileged user can terminate arbitrary processes that are running at a higher privilege. The following are affected products and versions: Legion Y520T_Z370 6.0.1.8642, AIO310-20IAP 6.0.1.8642, AIO510-22ISH 6.0.1.8642, AIO510-23ISH 6.0.1.8642, AIO520-22IKL 6.0.1.8642, AIO520-22IKU 6.0.1.8642, AIO520-24IKL 6.0.1.8642, AIO520-24IKU 6.0.1.8642, AIO520-27IKL 6.0.1.8642, AIO720-24IKB 6.0.1.8642, IdeaCentre 520S-23IKU 6.0.1.8642, ThinkCentre M700z 6.0.1.8642, ThinkCentre M800z 6.0.1.8642, ThinkCentre M810z 6.0.1.8642, ThinkCentre M818z 6.0.1.8642, ThinkCentre M900Z 6.0.1.8642, ThinkCentre M910z 6.0.1.8642, V410z(YT S4250) 6.0.1.8642, 330-14IKBR Win10:6.0.1.8652, 330-15IKBR Win10:6.0.1.8652, 330-15IKBR (Brazil) Win10:6.0.1.8652, 330-15IKBR Touch Win10:6.0.1.8652, 330-17IKBR Win10:6.0.1.8652, YOGA 730-13IKB Win10:6.0.1.8644, YOGA 730-15IKB Win10:6.0.1.8644, ThinkPad L560 6.0.1.8644 and 6.0.1.8652, ThinkPad L570 6.0.1.8644 and 6.0.1.8652, ThinkPad P50 6.0.1.8642, ThinkPad P50s 6.0.1.8642, ThinkPad P51s (20Jx, 20Kx) 6.0.1.8642, ThinkPad P51s (20Hx) 6.0.1.8642, ThinkPad P52s 6.0.1.8642, ThinkPad P70 6.0.1.8642, ThinkPad T25 6.0.1.8642, ThinkPad T460s 6.0.1.8642, ThinkPad T470 6.0.1.8642, ThinkPad T470s 6.0.1.8642, ThinkPad T480 6.0.1.8642, ThinkPad T480s 6.0.1.8642, ThinkPad T560 6.0.1.8642, ThinkPad T570 6.0.1.8642, ThinkPad T580 6.0.1.8642, ThinkPad X1 Carbon 8.66.76.72 and 8.66.68.54, ThinkPad X1 Carbon 6th 6.0.1.8642, ThinkPad X1 Carbon, X1 Yoga 8.66.62.92 and 8.66.62.54, ThinkPad X1 Tablet (20Gx) 6.0.1.8642, ThinkPad X1 Tablet (20Jx) 6.0.1.8642, ThinkPad X1 Tablet Gen 3 6.0.1.8642, ThinkPad X1 Yoga (20Jx) 8.66.88.60, ThinkPad X1 Yoga 3rd 6.0.1.8642, ThinkPad X280 6.0.1.8642, ThinkPad Yoga 260, S1 8.66.62.92 and 8.66.62.54.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

This is a local privilege escalation vulnerability in the Dolby DAX2 API system services installed on Lenovo systems. A low-privileged local user can terminate arbitrary processes running at higher privilege levels due to missing authorization checks in the DAX2 API service. This allows an unprivileged attacker to kill critical system processes or other users' privileged processes.

MitigationApply vendor-supplied patches from Lenovo for the affected product versions. Lenovo released security updates addressing this vulnerability in their support advisories.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Legion Y520t Z370 FirmwareOperating system
Affected:< 6.0.1.8642
Aio310 20iap FirmwareOperating system
Affected:< 6.0.1.8642
Aio510 22ish FirmwareOperating system
Affected:< 6.0.1.8642
Aio510 23ish FirmwareOperating system
Affected:< 6.0.1.8642
Aio520 22ikl FirmwareOperating system
Affected:< 6.0.1.8642
Aio520 22iku FirmwareOperating system
Affected:< 6.0.1.8642
Aio520 24ikl FirmwareOperating system
Affected:< 6.0.1.8642
Aio520 24iku FirmwareOperating system
Affected:< 6.0.1.8642

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the system model
    Run 'systeminfo' or check the device manager to confirm the Lenovo model matches one of the affected products: Legion Y520t Z370, Aio310 20iap, Aio510 22ish, Aio510 23ish, Aio520 22ikl, Aio520 22iku, Aio520 24ikl, or Aio520 24iku.
    Affected if The system model matches one of the listed affected Lenovo AIO or Legion models.
  2. Check the firmware version
    Access the UEFI/BIOS settings during boot or use a tool like 'wmic bios get smbiosbiosversion' to retrieve the firmware version.
    Affected if The firmware version is lower than 6.0.1.8642.
  3. Locate the Dolby DAX2 API service
    Open Services management (services.msc) or run 'sc query' to search for services containing 'DAX', 'Dolby', or 'DAX2' in the name.
    Affected if A Dolby DAX2 or DAX API service is present on the system.
  4. Verify service running status
    Run 'sc query [service name]' or check the Services console to confirm the DAX2 service is currently running.
    Affected if The Dolby DAX2 API service is installed and running with elevated privileges.

The system is affected if it is one of the listed Lenovo models with firmware version below 6.0.1.8642 and has the Dolby DAX2 API service installed and running.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to 6.0.1.8642 or later
Fixed in 6.0.1.8642
Interim mitigation

Apply vendor-supplied patches from Lenovo for the affected product versions. Lenovo released security updates addressing this vulnerability in their support advisories.

Fix this in Legion Y520t Z370 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2019-10724 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data