CVE-2022-2950

Executive Summary

CVE-2022-2950 is a memory corruption vulnerability in Altair HyperView Player versions 2021.1.0.27 and prior, arising from the use of uninitialized memory during the parsing of H3D files. A DWORD value is read from an uninitialized buffer, sign-extended, and subsequently used as an index into a stack variable to increment a counter, resulting in memory corruption. Successful exploitation could lead to arbitrary code execution in the context of the logged-in user, or denial of service. The vendor has released version 2022.1 to address the issue, though patch confirmation is limited to a single source (CNA). Organizations using affected HyperView Player versions should prioritize upgrading.

Technical Analysis

The vulnerability class is use of uninitialized memory (CWE-457). According to the NVD description, the flaw resides in the H3D file parsing routine of HyperView Player. Specifically, during parsing, a DWORD (4-byte value) is extracted from a buffer that has not been previously initialized. Because the buffer contents are undefined, the extracted DWORD may contain arbitrary or attacker-influenced data.

After this DWORD is read, it undergoes sign extension — converting the 32-bit value into a wider signed integer type (e.g., 64-bit). This sign-extended value is then used as an index into a stack-allocated variable to increment a counter. Two primary outcomes are possible:

1. Out-of-bounds write/indexing: If the extracted uninitialized DWORD is negative after sign extension, the index becomes negative, pointing before the stack buffer. Conversely, if the uninitialized DWORD is large and positive, the index exceeds the stack buffer bounds. Either case causes the counter increment operation to write to an invalid memory location, corrupting adjacent stack data (e.g., saved return addresses, stack frame metadata).

2. Memory disclosure: Since the DWORD is uninitialized, its value may also expose residual stack data to the parsing logic itself, though this is secondary to the memory corruption impact.

The attack surface is the file parsing functionality. The H3D format is Altair's proprietary 3D visualization format, used in engineering/simulation result viewing. A victim must be coerced into opening a crafted H3D file — either via email attachment, downloaded from a malicious website, or received from a compromised engineering collaboration channel.

The technical details are limited to the NVD description; no specific function names, API endpoints, or code paths are provided. The parsing routine likely resides in a native code library (given the C++/C nature of the description referencing "DWORD" and "stack variable").

Exploitation Scenarios

The attack chain for CVE-2022-2950 is inferred from the vulnerability class, as no public PoC is available:

Step 1 — Reconnaissance/Target Identification: The target is any user of Altair HyperView Player versions 2021.1.0.27 and prior. Attackers may identify targets through:

• Enterprise asset discovery (e.g., software inventory systems showing HyperView Player installations)
• Professional networking/social engineering targeting engineering departments
• Supply chain compromise: attackers may compromise file-sharing platforms used by CAD/CAE teams to distribute malicious H3D files

Step 2 — Flaw Triggering: The attacker crafts a malicious H3D file. Because the vulnerability relies on uninitialized memory — rather than a malformed file section explicitly — the attacker's goal is to influence the contents of the uninitialized stack buffer. This can be achieved indirectly by:

• Heap/stack shaping: The attacker structures the H3D file so that prior parsing operations leave specific residual data on the stack in the region that will later be read as uninitialized. This is a common technique for uninitialized-memory bugs where the attacker attempts to contaminate the target buffer with attacker-controlled data.
• Brute-force/opportunistic exploitation: If precise control over the uninitialized byte content is not achievable, the attacker may rely on probabilistic exploitation, where random stack residue yields an exploitable index value.

Step 3 — Payload/Execution at Vulnerability-Class Level: The sign-extended DWORD acts as an index for a counter increment on a stack variable. Exploitation mechanics at the class level:

• Out-of-bounds write: A crafted index causes the counter increment to write a small integer value (e.g., 1) to an out-of-bounds stack location. Repeated parsing of multiple such file sections could increment the same target location multiple times, allowing an attacker to progressively corrupt a stack canary, a saved instruction pointer, or a function pointer.
• Stack pivot / control-flow hijack: If the corrupted value (after increment) alters a saved return address or function pointer, execution flow can be redirected to attacker-controlled shellcode (e.g., in the heap). Modern mitigations (ASLR, DEP) would need to be bypassed; however, given the desktop application context, DEP is often enabled but not guaranteed for all memory regions.
• Denial of service: A non-exploitable crash (access violation) is the likely outcome if index corruption leads to dereferencing an invalid address.

Step 4 — Post-Exploitation Impact:

• Full compromise of the user's session with privileges of the logged-in user (CVSS privileges-required component is None, meaning no privileges needed to trigger, but the impact on confidentiality/integrity/availability is High).
• Lateral movement into corporate networks via the compromised workstation (engineering workstations often have elevated network access to CAD/CAE servers, file shares, and database systems containing proprietary design data).
• Theft of intellectual property: H3D files often contain 3D geometry and simulation results, which are high-value trade secrets for engineering firms.

Note: No public PoC is available; the above attack chain is inferred from the vulnerability class and standard exploitation techniques for uninitialized-memory bugs.

Impact Assessment

CVSS Score: 7.8 (High) — The vulnerability requires user interaction (opening a malicious file) but no special privileges. Local attack vector. Confidentiality, Integrity, and Availability impacts are all rated High.

Business Impact:

• Intellectual Property Theft: Engineering and simulation data (H3D files) represent significant R&D investment. Compromise could leak proprietary product designs.
• Operational Disruption: Denial-of-service via crash is trivial to trigger; targeted corruption can render the application unstable.
• Compliance: Industries relying on Altair tools (automotive, aerospace, defense) may be subject to export control regulations (ITAR/EAR) — data exfiltration could have regulatory consequences.

Affected Systems:

• Altair HyperView Player versions 2021.1.0.27 and prior — installed on Windows engineering workstations typically.
• Systems that receive H3D files via shared drives, email, or collaborative platforms.

Blast Radius:

• Single-user compromise per malicious file, but engineering teams often share visualization files broadly. A single crafted file distributed via a shared repository could compromise multiple workstations.
• No known supply-chain compromise of the software installer itself; attack requires local file opening.

Detection Guidance

Note: Detection is challenging because exploitation occurs during local file parsing. Network-based detection (Suricata) may only catch initial file delivery. Host-based detection (Sigma, YARA, Elastic, Splunk, Wazuh) focuses on the process behavior.

Sigma Rule

title: Suspicious Altair HyperView Player H3D File Parsing Activity
id: 12d5e8f0-3a4b-4c5d-9e6f-1a2b3c4d5e6f
status: experimental
description: Detects abnormal process behavior from Altair HyperView Player when parsing H3D files, potentially indicating exploitation of CVE-2022-2950 (uninitialized memory)
author: Valtersit Threat Intelligence
date: 2024/01/15
logsource:
    category: process_creation
    product: windows
detection:
    selection_process:
        Image|endswith: '\\HyperView.exe'  # Common player executable name
    selection_crash:
        EventID: 1000  # Windows Error Reporting for application crash
    selection_h3d:
        CommandLine|contains: '.h3d'
    condition: selection_process and (selection_crash or selection_h3d)
    timeframe: 1h
level: medium
falsepositives:
    - Legitimate use of HyperView Player with H3D files
    - Some install paths may differ; adjust Image path accordingly

YARA Rule

rule CVE_2022_2950_Altair_HyperView_H3D_Suspicious
{
    meta:
        author = "Valtersit Threat Intelligence"
        description = "Detects H3D files with patterns potentially indicative of crafted files targeting CVE-2022-2950 uninitialized memory bug in Altair HyperView Player"
        date = "2024-01-15"
        reference = "CVE-2022-2950"
        score = 60
    strings:
        $h3d_magic = "H3D" ascii wide
        $suspicious_length = { FF FF FF FF }  // 0xFFFFFFFF - extreme length fields
        $negative_indicator = { 80 00 00 00 }  // Possible negative DWORD pattern
        $repeated_sequence = { 4D 53 41 4A 4D 53 41 4A 4D 53 41 4A }  // Repeated pattern — indicative of heap spray / stack shaping
    condition:
        $h3d_magic at 0 and
        ( any of ($suspicious_length*, $negative_indicator*, $repeated_sequence*) )
}

Note: This YARA rule is heuristic and will produce false positives on legitimate files. It is not a precise signature for the vulnerability itself.

Suricata IDS Rule

alert http any any -> $HOME_NET any (msg:"ET TROJAN Possible Altair H3D Malicious File Download - CVE-2022-2950"; flow:established,to_client; filemagic:"H3D"; content:"H3D"; depth:3; offset:0; pcre:"/\.h3d$/i"; classtype:trojan-activity; sid:20229501; rev:1; metadata:created_at 2024_01_15, updated_at 2024_01_15, cve CVE-2022-2950;)

alert smtp any any -> $HOME_NET any (msg:"ET TROJAN Suspicious H3D Attachment in Email - CVE-2022-2950"; flow:established,to_client; content:".h3d"; nocase; content:"filename"; nocase; pcre:"/filename\s*=\s*[^\r\n]*\.h3d/i"; classtype:trojan-activity; sid:20229502; rev:1; metadata:created_at 2024_01_15, updated_at 2024_01_15, cve CVE-2022-2950;)

Elastic Detection

// Detect process crashes or unusual exit codes from HyperView Player
sequence by process.entity_id
  [ process where process.name == "HyperView.exe" and event.type == "start" ]
  [ process where process.name == "HyperView.exe" and event.type == "end" and process.exit_code == -1073741819 ]  // 0xC0000005 (ACCESS_VIOLATION)

// Detect file creation events of H3D files with abnormal size (potential crafted payload)
file where file.extension == "h3d" and file.size > 50000000  // > 50 MB — unusually large

Splunk SPL Query

index=windows EventCode=1000 OR EventCode=1001
| search "HyperView" OR "Altair"
| table _time, EventCode, Message, ComputerName
| eval vulnerable_version = if(match(Message, "2021\.1\.0\.27|2019|2020"), "YES", "NO")
| where vulnerable_version = "YES"

index=windows sourcetype=WinEventLog:Security EventCode=4688  // Process creation
| search CommandLine="*.h3d*"
| eval player_involved = if(match(Process_Name, "(?i)hyperview|altair"), "YES", "NO")
| where player_involved = "YES"

Wazuh OSSEC Rule

<group name="hyperview,">
    <rule id="100295" level="10">
        <if_sid>100293</if_sid>  <!-- Parent rule for new process -->
        <match>HyperView.exe</match>
        <description>Altair HyperView Player executed — potential CVE-2022-2950 exploitation trigger via malicious H3D file</description>
        <group>attack.initial_access,</group>
        <mitre>
            <id>T1203</id>
        </mitre>
    </rule>

    <rule id="100296" level="12">
        <if_sid>100295</if_sid>
        <match>Application Error</match>
        <match>0xc0000005</match>
        <description>Altair HyperView Player crashed with access violation — possible CVE-2022-2950 exploitation</description>
        <group>attack.execution,</group>
        <mitre>
            <id>T1203</id>
        </mitre>
    </rule>
</group>

Mitigation & Patch Guidance

Patch Confidence: 2/4 (CLAIMED) — Only the CNA (Altair) claims a patch is available; independent verification is lacking. Exercise caution and test thoroughly before production rollout.

1. Immediate Mitigations (until patch applied):

   • Restrict execution of HyperView Player on managed systems to authorized users only.
   • Block potentially malicious H3D files at the email gateway (file type filtering).
   • Educate engineering staff on the risks of opening H3D files from untrusted sources (email attachments, unknown shared links).
   • Employ application whitelisting (e.g., AppLocker, Windows Defender Application Control) to prevent launching the player unless explicitly approved.

2. Patch/Upgrade Steps:

   • Upgrade to HyperView Player v2022.1 downloaded from the official Altair One Marketplace: https://altairone.com/Marketplace.
   • Verify the integrity of the downloaded installer (SHA-256 checksum or code-signing certificate).
   • Deploy to a small pilot group before wide rollout to confirm compatibility with existing H3D workflows.
   • Retire/uninstall all versions <= 2021.1.0.27 permanently after successful migration.

3. Long-Term Hardening:

   • Implement a vulnerability management process for engineering software — these tools are often overlooked in standard patch cycles.
   • Segment engineering workstations that handle sensitive H3D/simulation data from the broader corporate network where feasible.
   • Monitor for H3D file prevalence and access patterns; anomalous spikes warrant investigation.
   • Enable OS-level exploit mitigations (DEP, ASLR, Control Flow Guard) — verify they are enforced for HyperView Player.
   • Consider security reviews of any third-party visualization/engineering software given their historical vulnerability patterns in file-parsing code.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2022-2950
2. Altair One Marketplace (vendor fix): https://altairone.com/Marketplace
3. MITRE ATT&CK Technique T1203: https://attack.mitre.org/techniques/T1203/
4. CWE-457 (Use of Uninitialized Variable): https://cwe.mitre.org/data/definitions/457.html
5. EPSS Score Reference: https://www.first.org/epss/

Known Threat Actor Campaigns / Exploit-in-the-Wild Evidence:

• None reported. The CVE is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. No public exploit code or PoC has been identified. EPSS score is low (0.00304, 22.8th percentile), indicating low active exploitation likelihood. However, the lack of public PoC does not preclude targeted exploitation by sophisticated actors, particularly given the high value of engineering intellectual property in affected organizations.