CVE-2022-2951

Executive Summary

CVE-2022-2951 is an improper validation of array index vulnerability (CWE-129) affecting Altair HyperView Player versions 2021.1.0.27 and prior. The flaw resides in the processing of H3D files, where a DWORD value extracted from a malicious file is used as an array index to write to a buffer, resulting in memory corruption. Successful exploitation requires user interaction — specifically, opening a crafted H3D file — and can lead to arbitrary code execution or denial of service in the context of the logged-in user. The vendor has released a patched version (v2022.1) via the Altair One Marketplace, though patch confirmation remains unverified by independent sources.

Technical Analysis

The vulnerability is classified under CWE-129: Improper Validation of Array Index. This weakness class occurs when software fails to validate that an index used to access an array is within the bounds of that array. In the context of this CVE, the NVD description states that a DWORD value (a 32-bit unsigned integer) is extracted from a specially crafted H3D file and subsequently used as an index into a buffer for a write operation.

The attack mechanism is as follows:

1. File Parsing: HyperView Player processes H3D files (a proprietary 3D visualization format used in engineering/simulation contexts). During parsing, the application reads a DWORD from the file structure.
2. Insufficient Validation: The extracted DWORD is not validated against the actual size of the destination buffer. No bounds check is performed to ensure the index falls within the allocated memory region.
3. Out-of-Bounds Write: The DWORD is used as an array index for a write operation. If the value is larger than the buffer's length, the write occurs outside the allocated memory bounds.
4. Memory Corruption: This out-of-bounds write can corrupt adjacent heap or stack memory, potentially leading to arbitrary code execution, application crashes, or the corruption of critical data structures.

The lack of details regarding the specific buffer, function names, or exact parsing code path in the NVD description means the internal implementation specifics remain opaque. However, the vulnerability class is well-understood — out-of-bounds array writes during file parsing are a classic memory corruption vector, frequently exploited in parsing applications that handle untrusted, user-supplied files (e.g., PDF readers, image viewers, 3D model viewers).

The affected application, HyperView Player, is a free 3D model and simulation results viewer distributed by Altair. It is commonly used to open and visualize finite element analysis (FEA) results, crash simulation outputs, and other CAE (computer-aided engineering) data. This distribution model significantly broadens the attack surface, as the application is widely deployed across engineering workstations in the automotive, aerospace, and manufacturing sectors.

The CVSS score of 7.8 reflects the high severity of this issue — an attacker can achieve high confidentiality, integrity, and availability impact (C:H/I:H/A:H) with local attack vector and minimal preconditions (user interaction required, no privileges needed on the target).

Exploitation Scenarios

No public PoC or exploit code is available for this CVE at the time of writing. The attack chain below is inferred from the vulnerability class and the NVD description.

Step 1: Reconnaissance / Target Identification An attacker would identify organizations or individuals using Altair HyperView Player. This could be accomplished via:

• Scanning internal networks for the installed application.
• Targeting engineering firms, manufacturing companies, or research institutions where CAE tools are prevalent.
• Distributing malicious H3D files via phishing emails, compromised file-sharing platforms, or engineering forums where such files are commonly exchanged.

Step 2: Triggering the Flaw The attacker crafts a malicious H3D file containing a DWORD value designed to exceed the bounds of the target buffer. The file must be crafted to pass initial parsing checks, ensuring the malformed DWORD reaches the vulnerable code path without being rejected by earlier validation.

Step 3: Payload Delivery / Execution When the victim opens the malicious H3D file in HyperView Player, the application extracts the attacker-controlled DWORD and uses it as an array index for a write operation. The out-of-bounds write corrupts memory. Depending on the specifics of heap layout and the overwritten data, the attacker can:

• Redirect execution flow to attacker-controlled shellcode (arbitrary code execution).
• Corrupt function pointers or return addresses to hijack control flow.
• Trigger a controlled crash, leading to denial of service.

Step 4: Post-Exploitation Impact If arbitrary code execution is achieved, the attacker runs code in the context of the logged-in user. This allows:

• Theft of sensitive engineering data, intellectual property, proprietary simulation results, and CAD models.
• Persistence mechanisms on the compromised workstation.
• Lateral movement within the corporate network (if the workstation is domain-joined).

Note: No public PoC is available; the attack chain is inferred from the vulnerability class and NVD description. The complexity of crafting a reliable, weaponized H3D file may be non-trivial, potentially limiting in-the-wild exploitation.

Impact Assessment

Business Impact: High. This vulnerability affects a specialized but widely deployed engineering tool. Exploitation leads to memory corruption, which can compromise the integrity of the host system. The high confidentiality impact (C:H) reflects the potential for intellectual property theft — engineering data, simulation models, and proprietary designs are prime targets for industrial espionage.

Affected Systems: All installations of Altair HyperView Player versions 2021.1.0.27 and prior. Given the application's free distribution model, the installed base likely spans large enterprises, SMBs, and academic institutions.

Blast Radius: The CVSS subscores (C:H/I:H/A:H) indicate that successful exploitation can fully compromise confidentiality, integrity, and availability. The local attack vector (AV:L) requires user interaction, but the prevalence of phishing and the ease of distributing a malicious H3D file (which may be perceived as benign data) reduces this barrier.

Exploitation Likelihood: The EPSS score of 0.00270 (19.0% percentile) suggests low current exploitation activity. The vulnerability is not listed on the CISA KEV catalog. However, memory corruption vulnerabilities in file-parsing applications frequently attract researcher attention, and weaponization is a plausible future development.

Detection Guidance

The following detection rules may help identify attempted exploitation of CVE-2022-2951 or malicious H3D file deliveries.

Sigma Rule

title: Potential Exploitation of CVE-2022-2951 via HyperView Player
id: 8c0f65c3-2e9d-4f6a-8b4c-7e1a8f2d9c4a
status: experimental
description: Detects suspicious behavior associated with Altair HyperView Player crashing, spawning child processes, or accessing abnormal memory regions after processing H3D files.
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2022-2951
    - https://altairone.com/Marketplace
author: Valtersi Threat Intelligence
date: 2024/02/15
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\hvplayer.exe'
        CommandLine|contains: '.h3d'
    filter:
        ParentImage|endswith: '\explorer.exe'
    condition: selection and not filter
level: medium
falsepositives:
    - Legitimate opening of H3D files from trusted sources
    - Executable filename may vary by installation

Note: This rule is heuristic, as no public indicators of compromise are available. Adjust the executable name based on actual installation.

YARA Rule

rule CVE_2022_2951_H3D_Anomalous_DWORD
{
    meta:
        author = "Valtersi Threat Intelligence"
        description = "Detects H3D files with anomalous DWORD patterns potentially crafted for CVE-2022-2951"
        date = "2024-02-15"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2022-2951"
        score = 50
    strings:
        // Look for H3D file magic (common 3D file header) - adjust as needed
        $h3d_magic = { 48 33 44 } // "H3D" ASCII
        // Anomalous DWORD = 0xFFFFFFFF or 0x7FFFFFFF (large values used as OOB indices)
        $large_dword1 = { FF FF FF FF }
        $large_dword2 = { FF FF FF 7F }
        // Pattern for other large values often used in PoCs
        $large_dword3 = { 00 00 00 80 } // 0x80000000
    condition:
        uint32be(0) == 0x48334400 or $h3d_magic and
        (1 of ($large_dword*)) and
        filesize < 10MB
}

Note: This rule is a starting point based on inferred PoC characteristics. Validate against legitimate H3D files to reduce false positives.

Suricata IDS Rule

alert file any any -> any any (msg:"CVE-2022-2951 Potential Malicious H3D File"; 
    filemagic:"H3D"; 
    fileext:"h3d"; 
    content:"|FF FF FF FF|"; offset:0; depth:100;
    content:"|FF FF FF 7F|"; offset:0; depth:100;
    sid:20242951; rev:1; 
    reference:cve,2022-2951;
    classtype:attempted-user; 
    metadata:created_at 2024-02-15, updated_at 2024-02-15;)

Note: The rule will look for commonly used large DWORD values in files with H3D magic. Tune signatures carefully to avoid false positives on legitimate files.

Elastic Detection

process where event.type == "start" and process.name == "hvplayer.exe" and
  (process.args : "*.h3d") and
  (/* Detecting crashes following H3D opening */
   process.parent.name == "WerFault.exe" or
   process.name == "WerFault.exe")

Note: This EQL detects the sequence of a H3D file being opened followed by a Windows Error Reporting event, which can signal a crash from exploitation attempts. Alternatives: correlate file access events with application crash event IDs (1000, 1002 in Windows Event Log).

Splunk SPL Query

index=windows sourcetype=ProcessRollup2 OR sourcetype=WinEventLog:Security
| search (Image="*hvplayer.exe" OR process_name="hvplayer.exe") AND CommandLine="*.h3d"
| OR
| search source="WinEventLog:Application" EventCode=1000 OR EventCode=1002
| where message LIKE "*hvplayer*" 
| stats count by Image, CommandLine, host, _time
| sort - _time

Note: Query combines process creation events for hvplayer.exe opening h3d files, with crash events from Windows Application event log, to surface potential exploitation attempts.

Wazuh OSSEC Rule

<group name="hyperview,">
    <rule id="205101" level="12">
        <if_sid>1002</if_sid> <!-- Windows Error Reporting -->
        <field name="win.event.data">hvplayer.exe</field>
        <description>HyperView Player crashed shortly after opening a file. Potential CVE-2022-2951 exploitation.</description>
        <group>cve-2022-2951</group>
    </rule>
    <rule id="205102" level="7">
        <if_sid>1</if_sid> <!-- Process start -->
        <field name="win.event.dat.commandline">\.h3d</field>
        <field name="win.event.dat.image">hvplayer.exe</field>
        <description>HyperView Player launched with a .h3d file.</description>
    </rule>
</group>

Note: These rules require the Windows Event Log monitoring module. The high severity (level 12) for the crash rule reflects potential exploitation. Tune to environment.

Mitigation & Patch Guidance

Patch Confidence: 2/4 (CLAIMED — single source claims patch, not independently confirmed)

Immediate Mitigations:

1. Disable HyperView Player on systems that do not require it for critical business functions, until the patch can be applied.
2. Restrict H3D file access: Implement application whitelisting and restrict which directories/templates can be read by HyperView Player.
3. User awareness: Educate engineering teams that H3D files are executable vectors. Only accept H3D files from trusted internal sources and verified third parties.
4. Email filtering: Block or isolate email attachments with .h3d extensions, particularly from external senders.

Patch/Upgrade Steps:

1. Download HyperView Player v2022.1 from the Altair One Marketplace: https://altairone.com/Marketplace
2. Verify the integrity of the downloaded installer (checksum verification if available).
3. Uninstall the current version before installation.
4. Install the updated version and verify the installation via Help > About.
5. Because patch confirmation is not independently verified, monitor vendor advisories for further announcements.

Long-Term Hardening:

1. Software Inventory: Maintain a current inventory of all engineering tool installations. Use automated tools to track software versions and flag outdated installations.
2. Vulnerability Scanning: Include Altair products in regular vulnerability scans.
3. Least Privilege: Run HyperView Player (and similar parsing applications) under accounts with least privilege, especially on systems handling sensitive engineering data.
4. Application Sandboxing: Consider running HyperView Player in a virtualized environment or with restrictions (e.g., via Windows Sandbox or a hardened container) when handling files from external parties.
5. Incident Response Readiness: Ensure the detection rules above are deployed and SOC analysts are familiar with the alerting patterns.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2022-2951
2. Vendor Advisory / Patch Source: https://altairone.com/Marketplace
3. CWE-129 Reference: https://cwe.mitre.org/data/definitions/129.html

Known Threat Actor Campaigns / Exploit-in-the-Wild: No evidence of active exploitation, PoC publication, or inclusion in the CISA KEV catalog was identified during this analysis. The EPSS score (0.00270, 19.0% percentile) indicates very low current exploitation probability. However, given the vulnerability class and affected system type (CAE software in engineering sectors), organizations handling sensitive simulation data should treat this with enhanced scrutiny and prioritize patching.