CVE-2022-31636

Q: What is the severity of CVE-2022-31636?

CVE-2022-31636 has a CVSS score of 7.8 (HIGH). This CVE describes a time-of-check to time-of-use (TOCTOU) vulnerability in the BIOS of certain HP PC products. It could allow attackers to execute arbitrary code, escalate privileges, cause denial of service, or disclose information. Affected users are those with specific HP PC models running vulnerable BIOS versions.

7.8 HIGH

📋 TL;DR

This CVE describes a time-of-check to time-of-use (TOCTOU) vulnerability in the BIOS of certain HP PC products. It could allow attackers to execute arbitrary code, escalate privileges, cause denial of service, or disclose information. Affected users are those with specific HP PC models running vulnerable BIOS versions.

💻 Affected Systems

Products:

HP PC products (specific models listed in HP advisory)

Versions: Multiple BIOS versions for affected HP PC models

Operating Systems: All operating systems running on affected hardware

Default Config Vulnerable: ⚠️ Yes

Notes: Requires local access to the system. Affected models include various HP Elite, Pro, and Z-series workstations and desktops.

📦 What is this software?

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Z2 Small Form Factor G9 Workstation Firmware by Hp

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Zbook Fury 17.3 Inch G8 Mobile Workstation Pc Firmware by Hp

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Zbook Power 15.6 Inch G8 Mobile Workstation Pc Firmware by Hp

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Zbook Power 15.6 Inch G9 Mobile Workstation Pc Firmware by Hp

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Zbook Power G7 Firmware by Hp

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Zbook Studio 15.6 Inch G8 Mobile Workstation Pc Firmware by Hp

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Zbook Studio 16 Inch G9 Mobile Workstation Pc Firmware by Hp

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Zbook Studio G3 Firmware by Hp

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Zbook Studio G4 Firmware by Hp

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Zbook Studio G5 Firmware by Hp

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Zbook Studio G7 Firmware by Hp

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Zbook Studio X360 G5 Firmware by Hp

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Zbook X2 G4 Firmware by Hp

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Zcentral 4r Workstation Firmware by Hp

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Zhan 66 Pro 13 G2 Firmware by Hp

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Zhan 66 Pro 14 G2 Firmware by Hp

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Zhan 66 Pro 14 G3 Firmware by Hp

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Zhan 66 Pro 14 G4 Notebook Pc Firmware by Hp

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Zhan 66 Pro 14 Inch G5 Notebook Pc Firmware by Hp

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Zhan 66 Pro 15 G2 Firmware by Hp

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Zhan 66 Pro 15 G3 Firmware by Hp

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Zhan 66 Pro A 14 G3 Firmware by Hp

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Zhan 66 Pro A 14 G4 Notebook Pc Firmware by Hp

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Zhan 66 Pro A 14 G5 Notebook Pc Firmware by Hp

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Zhan 66 Pro G1 Firmware by Hp

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Zhan 66 Pro G3 22 All In One Pc Firmware by Hp

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Zhan 66 Pro G3 24 All In One Pc Firmware by Hp

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Zhan X 13 G2 Firmware by Hp

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⚠️ Risk & Real-World Impact

🔴

Worst Case

Full system compromise with persistent BIOS-level malware, allowing attackers to bypass operating system security controls and maintain persistence across reboots.

🟠

Likely Case

Local privilege escalation allowing attackers to gain administrative access to the system and potentially install additional malware.

🟢

If Mitigated

Limited impact if proper BIOS write protection and secure boot are enabled, though some information disclosure may still occur.

🌐 Internet-Facing: LOW - This requires local access or physical presence to exploit.

🏢 Internal Only: MEDIUM - Insider threats or compromised internal accounts could exploit this vulnerability.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: HIGH

Exploitation requires local access and knowledge of BIOS internals. TOCTOU vulnerabilities are timing-sensitive and complex to exploit reliably.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: BIOS updates provided by HP (version varies by model)

Vendor Advisory: https://support.hp.com/us-en/document/ish_7149996-7150021-16/hpsbhf03814

Restart Required: Yes

Instructions:

1. Visit HP Support website. 2. Enter your HP PC model. 3. Download latest BIOS update. 4. Run BIOS update utility. 5. Restart system when prompted.

🔧 Temporary Workarounds

Enable BIOS write protection

all

Configure BIOS settings to prevent unauthorized BIOS modifications

Enable Secure Boot

all

Enable UEFI Secure Boot to prevent unauthorized code execution during boot process

🧯 If You Can't Patch

Restrict physical access to affected systems
Implement strict access controls and monitor for suspicious BIOS modification attempts

🔍 How to Verify

Check if Vulnerable:

Check BIOS version against HP advisory for your specific PC model

Check Version:

Windows: wmic bios get smbiosbiosversion | Linux: sudo dmidecode -s bios-version

Verify Fix Applied:

Verify BIOS version has been updated to patched version listed in HP advisory

📡 Detection & Monitoring

Log Indicators:

Unexpected BIOS update attempts
BIOS modification events in system logs
Failed BIOS flash attempts

Network Indicators:

Unusual BIOS update traffic from internal systems

SIEM Query:

EventID=12 OR EventID=13 (BIOS modification events in Windows Event Log)

📊 Metadata

CVE ID: CVE-2022-31636

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CWE: CWE-367

Published: June 13, 2023

Last Updated: January 3, 2025

🔗 References

https://support.hp.com/us-en/document/ish_7149996-7150021-16/hpsbhf03814 Broken Link,Vendor Advisory
https://support.hp.com/us-en/document/ish_7149996-7150021-16/hpsbhf03814 Broken Link,Vendor Advisory

📋 TL;DR

💻 Affected Systems

📦 What is this software?

Dragonfly Folio 13.5 Inch G3 2 In 1 Notebook Pc Firmware by Hp

Elite Dragonfly 13.5 Inch G3 Notebook Pc Firmware by Hp

Elite Dragonfly Firmware by Hp

Elite Dragonfly G2 Firmware by Hp

Elite Dragonfly Max Firmware by Hp

Elite Mini 600 G9 Desktop Pc Firmware by Hp

Elite Mini 800 G9 Desktop Pc Firmware by Hp

Elite Sff 600 G9 Desktop Pc Firmware by Hp

Elite Sff 800 G9 Desktop Pc Firmware by Hp

Elite Slice Firmware by Hp

Elite Slice For Meeting Rooms Firmware by Hp

Elite Slice G2 Audio Ready With Zoom Rooms Firmware by Hp

Elite Slice G2 Partner Ready With Microsoft Teams Rooms Firmware by Hp

Elite Slice G2 With Intel Unite Firmware by Hp

Elite Slice G2 With Microsoft Teams Rooms Firmware by Hp

Elite Slice G2 With Zoom Rooms Firmware by Hp

Elite Tower 600 G9 Desktop Pc Firmware by Hp

Elite Tower 680 G9 Desktop Pc Firmware by Hp

Elite Tower 800 G9 Desktop Pc Firmware by Hp

Elite Tower 880 G9 Desktop Pc Firmware by Hp

Elite X2 1012 G1 Firmware by Hp

Elite X2 1012 G1 Tablet Firmware by Hp

Elite X2 1012 G1 Tablet With Travel Keyboard Firmware by Hp

Elite X2 1012 G2 Firmware by Hp

Elite X2 1013 G3 Firmware by Hp

Elite X2 G4 Firmware by Hp

Elite X2 G8 Tablet Firmware by Hp

Elite X360 1040 14 Inch G9 2 In 1 Notebook Pc Firmware by Hp

Elite X360 830 13 Inch G9 2 In 1 Notebook Pc Firmware by Hp

Elitebook 1030 G1 Firmware by Hp

Elitebook 1040 14 Inch G9 Notebook Pc Firmware by Hp

Elitebook 1040 G3 Firmware by Hp

Elitebook 1040 G4 Firmware by Hp

Elitebook 1050 G1 Firmware by Hp

Elitebook 630 13 Inch G9 Notebook Pc Firmware by Hp

Elitebook 640 14 Inch G9 Notebook Pc Firmware by Hp

Elitebook 645 14 Inch G9 Notebook Pc Firmware by Hp

Elitebook 650 15.6 Inch G9 Notebook Pc Firmware by Hp

Elitebook 655 15.6 Inch G9 Notebook Pc Firmware by Hp

Elitebook 725 G3 Firmware by Hp

Elitebook 725 G4 Firmware by Hp

Elitebook 735 G5 Firmware by Hp

Elitebook 735 G6 Firmware by Hp

Elitebook 745 G3 Firmware by Hp

Elitebook 745 G4 Firmware by Hp

Elitebook 745 G5 Firmware by Hp

Elitebook 745 G6 Firmware by Hp

Elitebook 755 G3 Firmware by Hp

Elitebook 755 G4 Firmware by Hp

Elitebook 755 G5 Firmware by Hp

Elitebook 820 G3 Firmware by Hp

Elitebook 820 G4 Firmware by Hp

Elitebook 828 G3 Firmware by Hp

Elitebook 828 G4 Firmware by Hp

Elitebook 830 13.3 Inch G9 Notebook Pc Firmware by Hp

Elitebook 830 G5 Firmware by Hp

Elitebook 830 G6 Firmware by Hp

Elitebook 830 G7 Firmware by Hp

Elitebook 830 G8 Firmware by Hp

Elitebook 835 13 Inch G9 Notebook Pc Firmware by Hp

Elitebook 835 G7 Firmware by Hp

Elitebook 835 G8 Firmware by Hp

Elitebook 836 G5 Firmware by Hp

Elitebook 836 G6 Firmware by Hp

Elitebook 840 14 Inch G9 Notebook Pc Firmware by Hp

Elitebook 840 Aero G8 Firmware by Hp

Elitebook 840 G3 Firmware by Hp

Elitebook 840 G4 Firmware by Hp

Elitebook 840 G5 Firmware by Hp

Elitebook 840 G5 Healthcare Edition Firmware by Hp

Elitebook 840 G6 Firmware by Hp

Elitebook 840 G6 Healthcare Edition Firmware by Hp

Elitebook 840 G7 Firmware by Hp

Elitebook 840 G8 Firmware by Hp

Elitebook 840r G4 Firmware by Hp

Elitebook 845 14 Inch G9 Notebook Pc Firmware by Hp

Elitebook 845 G7 Firmware by Hp