CVE-2022-2949

Executive Summary

CVE-2022-2949 is a memory corruption vulnerability in Altair HyperView Player versions 2021.1.0.27 and prior, triggered during the parsing of H3D files. The flaw stems from the use of uninitialized memory: a DWORD value extracted from an uninitialized buffer undergoes sign extension and is subsequently used as an index into a stack variable to increment a counter, leading to memory corruption. Exploitation requires an attacker to trick a user into opening a maliciously crafted H3D file, making this a client-side attack vector. Successful exploitation could allow an attacker to execute arbitrary code with the privileges of the user running HyperView Player, achieving a CVSS score of 7.8 (High) that reflects the potential for significant integrity and confidentiality impact.

Technical Analysis

Vulnerability Mechanism

The NVD description identifies the core flaw as a "use of uninitialized memory" vulnerability (CWE-457). The technical chain is described as follows:

1. Uninitialized Buffer Extraction: During the parsing of an H3D file, the parser allocates or references a buffer that is not properly initialized before use. A DWORD (32-bit unsigned integer) is extracted from this uninitialized buffer. Because the buffer contents were never written with valid data, the value of this DWORD is indeterminate and depends on the prior state of the heap or stack memory.

2. Sign Extension: The extracted DWORD is then passed through a sign extension operation. Since the DWORD is an unsigned 32-bit quantity, sign extension converts it into a signed 64-bit or wider integer. If the most significant bit of the DWORD is set (i.e., the raw value exceeds 0x7FFFFFFF), the sign extension produces a large negative value.

3. Indexing and Counter Increment: The sign-extended value is used as an index into a stack-resident variable (likely an array). The code then increments a counter at that computed index. Because the index can be negative (due to sign extension) or point far beyond the boundaries of the allocated stack array, the write operation targets an address outside the intended bounds, corrupting adjacent stack memory.

Attack Surface

• H3D File Format: H3D is a proprietary 3D visualization file format used by Altair HyperView for finite element analysis (FEA) and CAE visualization. The attack surface is exposed to any user who opens H3D files with the vulnerable HyperView Player.
• Client-Side Vector: The vulnerability is triggered locally when a file is parsed; no network-exposed service is involved at the parsing layer.
• Required Interaction: An attacker must deliver a malformed H3D file to the victim, typically via email attachment, malformed upload to a shared repository, or a web download.

Code-Level Observations

The NVD description reveals specific behavioral details:

• The vulnerable operation is a stack-based write ("used as an index into a stack variable to increment a counter").
• The out-of-bounds write is an increment operation (value at index += 1), not a direct overwrite of arbitrary bytes.
• The corruption is induced by an uninitialized DWORD whose sign-extension converts it into an out-of-bounds index.

This mechanism is indicative of a parser that fails to validate file-supplied parameters before using them as array indices, compounded by a failure to zero-initialize the buffer that feeds the index calculation. While the immediate effect is a counter increment (a write of a small constant), the out-of-bounds index can corrupt stack metadata (e.g., saved return addresses, stack canaries, or adjacent local variables), which can be leveraged for control-flow hijacking if memory layout is carefully arranged.

Exploitation Scenarios

Attack Chain (Inferred from Vulnerability Class)

No public PoC exists for CVE-2022-2949 as of the intelligence data provided. The exploitation chain is inferred from the vulnerability mechanism and typical client-side parsing vulnerabilities.

Step 1 — Reconnaissance / Target Identification

An attacker identifies individuals or organizations that routinely use Altair HyperView Player — e.g., automotive, aerospace, or manufacturing engineering teams working with CAE/FEA analysis files. Target discovery may leverage LinkedIn company listings, engineering forums, or professional email databases to identify users with engineering roles. The attacker prepares a malicious H3D file crafted to trigger the uninitialized memory path.

Step 2 — Triggering the Flaw

The victim opens the malicious H3D file using HyperView Player (version 2021.1.0.27 or earlier). The parser begins processing the file. A specific segment of the H3D file (a header field or embedded data structure) causes the parser to enter the code path that reads from an uninitialized buffer at an offset that the attacker has influenced by structuring the file contents. The DWORD read from the uninitialized buffer is attacker-influenced indirectly: the attacker controls the file's structure to position the parser into a state where the uninitialized buffer contains data that, when sign-extended, yields a specific negative or oversized index.

Step 3 — Payload / Execution

At the vulnerability-class level, the attacker exploits the out-of-bounds write to corrupt a stack variable—specifically a counter—located at a controlled offset. By carefully aligning the index (via heap feng shui or stack grooming), the attacker can:

• Corrupt a loop counter to cause additional out-of-bounds writes (escalation of the primitive).
• Overwrite saved frame pointers or return addresses to hijack control flow.
• Corrupt a function pointer stored on the stack, redirecting execution to a ROP chain or shellcode.

The sign-extension mechanism makes the attack particularly forgiving: a DWORD whose MSB is set (0x80000000–0xFFFFFFFF) yields a negative index, allowing writes before the array base, while a high positive value (0x00000000–0x7FFFFFFF) yields a write after the array. The attacker thus has a range of index values to target based on the raw DWORD value in the uninitialized buffer.

Step 4 — Post-Exploitation Impact

Once arbitrary code execution is achieved, the payload runs in the context of the logged-in user. Typical post-exploitation actions include:

• Deploying a backdoor (e.g., C2 beacon) for persistence.
• Escalating privileges to SYSTEM/root if other local vulnerabilities are present.
• Exfiltrating proprietary engineering data (FEA models, simulation results) from the machine or mapped network shares.

Limitations and Constraints

• User Interaction Required: The victim must open the malicious file; this is not a zero-click vulnerability.
• Deterministic Trigger Uncertain: The uninitialized buffer contents depend on prior memory state, requiring the attacker to either shape heap/stack allocations within the app or use repeated file delivery with slight variations to improve reliability.
• No Network-Based Trigger: The vulnerability is not exploitable remotely without a file delivery mechanism.

Impact Assessment

CVSS Score: 7.8 (High). The vector string was not provided; the score reflects a high-impact, low-complexity client-side vulnerability.

• Attack Vector (AV): Likely Local/Physical (file opens locally) with potential for Network delivery via social engineering.
• Attack Complexity (AC): Likely Low — the parser path is reachable with a crafted file; no special conditions beyond user interaction.
• Privileges Required (PR): None — victim opens the file.
• User Interaction (UI): Required — victim must open the malicious file.
• Confidentiality (C): High — potential arbitrary code execution permits full data access.
• Integrity (I): High — code execution allows file modification.
• Availability (A): High — memory corruption could cause crashes or facilitate denial of service.

Business Impact:

• Data Loss / IP Theft: Engineering organizations rely on HyperView for proprietary simulation and design data. Compromise exposes sensitive CAE models, material properties, and structural design information to attackers.
• Supply Chain Contamination: If final 3D models or analysis files (H3D) are generated on a compromised workstation and distributed internally or to partners, the malicious content could propagate through the supply chain, affecting multiple organizations.
• Operational Disruption: A crash-triggering exploit (even if not code execution) can disrupt engineering workflows; successful code execution could render workstations unusable or require reimaging.

Blast Radius:

• Directly Affected: All systems running HyperView Player ≤ 2021.1.0.27.
• Indirectly Affected: Shared network folders containing H3D files, downstream consumers of H3D files exported by compromised systems, and connected enterprise infrastructure (via lateral movement post-compromise).
• Percentile of Exploited CVEs: EPSS 0.00286 (20.9th percentile) suggests low in-the-wild exploitation, but this is a lagging indicator; the patch confidence is only 2/4 (single-source claim), meaning the patch may be incomplete.

Detection Guidance

The following detection rules target behavioral indicators of the vulnerability exploitation, primarily focused on the malicious H3D file opening event, unexpected parser crashes, and anomalous memory corruption patterns.

Sigma Rule

title: Altair HyperView Player Uninitialized Memory Exploitation Attempt
id: c8a3d4e5-9f1a-4b7c-8d2e-1f9a3b5c6d7e
status: experimental
description: Detects abnormal termination or crash of HyperView Player process following the opening of an H3D file, potentially indicating exploitation of CVE-2022-2949.
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2022-2949
author: ValtersIT Threat Intel Team
date: 2025/01/14
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\HvPlayer.exe'
    crash_condition:
        EventID: 1000  # Windows Application Error
        Data|contains: '0xc0000409'  # STATUS_STACK_BUFFER_OVERRUN
    filter:
        Image|endswith: '\HvPlayer.exe'
        ParentImage|endswith: '\explorer.exe'
    condition: selection and crash_condition and not filter
falsepositives:
    - Legitimate crashes of HyperView Player due to other file corruption
level: high
tags:
    - attack.t1203
    - cve.2022-2949

YARA Rule

rule CVE_2022_2949_H3D_Malicious_Content {
    meta:
        author = "ValtersIT Threat Intel Team"
        description = "Detects H3D files engineered to exploit uninitialized memory in Altair HyperView Player"
        date = "2025-01-14"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2022-2949"
        score = 70
    strings:
        // H3D magic/format marker (if commonly present in format header)
        $h3d_magic = "H3D" ascii
        // High-bit-set DWORD pattern common in sign-extension attacks
        $neg_index_lo = { 00 00 00 80 }
        $neg_index_hi = { FF FF FF FF }
        // Structure implying array index arithmetic in parser
        $stack_inc = { FF 4C 24 ?? } // inc dword ptr [rsp+disp8]
    condition:
        uint16(0) == 0x4833 and   // "3H" in little-endian
        ($h3d_magic at 0 or $h3d_magic at 4) and
        (any of ($neg_index_*) and $stack_inc)
}

Suricata IDS Rule

alert http any any -> $HOME_NET any (msg:"CVE-2022-2949 Altair HyperView Player H3D Malicious File Download"; flow:established,to_client; file.magic unknown; file.name match:"\.h3d$"; content:"H3D"; distance:0; within:8; classtype:attempted-user; sid:202294901; rev:1; metadata:created_at 2025_01_14, updated_at 2025_01_14, cve CVE-2022-2949, attack_target Client_Endpoint, deployment Perimeter, tag Exploit_Kit/Blacklist, mitre_attack_id T1203;)

Elastic Detection

// EQL query for Elastic SIEM to detect crash of HyperView Player potentially due to memory corruption
process where event.action == "process_started" and process.name == "HvPlayer.exe"
| follow
[ process where event.action == "process_terminated" and process.exit_code == 3221225477 ] // 0xC0000005 ACCESS_VIOLATION
| filter process.args in ("*.h3d")

Splunk SPL Query

index=windows sourcetype=XmlWinEventLog:Application
| search EventCode=1000
| where Image="*\\HvPlayer.exe"
| regex faulting_module=".*HvPlayer.*"
| eval exploit_candidate = if(exception_code IN ("0xc0000409", "0xc0000005"), "HIGH", "MEDIUM")
| stats count by host, Image, exception_code, exploit_candidate
| where exploit_candidate = "HIGH"

Wazuh OSSEC Rule

<group name="windows_application_crash,">
    <rule id="234394" level="12">
        <if_sid>60108</if_sid>
        <field name="win.eventdata.image">\|\|\\HvPlayer\.exe</field>
        <field name="win.eventdata.data">0xc0000409</field>
        <description>Potential CVE-2022-2949 exploitation: Altair HyperView Player crashed with stack buffer overrun after opening H3D file</description>
        <mitre>
            <id>T1203</id>
        </mitre>
        <group>cve-2022-2949,</group>
    </rule>
</group>

Mitigation & Patch Guidance

Patch Confidence Assessment: 2/4 — the vendor (Altair) has claimed a fix in HyperView Player v2022.1, but this has not been independently verified by a third party. The affected version range (≤ 2021.1.0.27) suggests the issue was fixed in the 2022.1 release, but this is based on the single CNA claim. Treat the patch with caution and verify by testing.

Immediate Mitigations (if patch cannot be applied):

1. Restrict HyperView Player usage to trusted workstations only.
2. Prevent H3D files from being opened from untrusted sources:
   • Block H3D attachments in email gateways (*.h3d) unless sender is explicitly trusted.
   • Use web filtering to block downloads of H3D files from unverified domains.
3. Implement environment-based controls:
   • Run HyperView Player in an isolated virtual machine or with application-level sandboxing (e.g., Windows Sandbox, AppContainer) to contain post-exploitation impact.
   • Use Restricted Admin Mode or run the application under standard (non-admin) user accounts.
4. Enable Exploit Protection in Windows Defender (DEP, ASLR, and Force Randomization for Images) for the HvPlayer.exe process.

Patch / Upgrade Steps:

1. Access the Altair One Marketplace at https://altairone.com/Marketplace.
2. Download HyperView Player v2022.1 (or later, if available).
3. Uninstall the existing HyperView Player installation.
4. Install the new version and verify the version number in Help → About.
5. Run a regression test by opening representative H3D files to confirm file compatibility.
6. Monitor the Altair support portal for additional patched versions or security advisories.

Long-Term Hardening:

1. Establish a process to monitor CVE feeds (NVD, vendor advisories) for Altair products and apply security updates within a defined SLA (e.g., within 7 days for client-side parsing software).
2. Implement a strict file handling policy: H3D files received from external parties must be validated in a sandbox environment before use on production engineering systems.
3. Deploy Managed Detection and Response (MDR) or Endpoint Detection and Response (EDR) with behavioral detection on engineering workstations to identify anomalous process behavior (e.g., unexpected child processes spawned by HvPlayer.exe).
4. Institute backup and recovery procedures for engineering data to minimize data loss if a workstation is compromised.
5. Request an independent security review of the vendor's patch by performing a differential analysis of the vulnerable (≤2021.1.0.27) and patched (2022.1) binaries to confirm the uninitialized memory issue is resolved.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2022-2949 — Official NVD vulnerability description; CVSS score 7.8.
2. Vendor Advisory (Altair One Marketplace): https://altairone.com/Marketplace — Vendor-provided upgrade location; HyperView Player v2022.1 contains mitigation.
3. CISA Known Exploited Vulnerabilities Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog — CVE-2022-2949 is NOT listed (no known exploitation in-the-wild per CISA KEV as of the data date).
4. EPSS (Exploit Prediction Scoring System): https://www.first.org/epss/ — EPSS score 0.00286, indicating low immediate likelihood of exploitation.
5. MITRE ATT&CK: https://attack.mitre.org/techniques/T1203/ — Technique T1203 "Exploitation for Client Execution" aligned with this vulnerability's attack vector.

Threat Actor Evidence: No known threat actor campaigns or in-the-wild exploitation have been publicly reported for CVE-2022-2949 as of the intelligence data provided. The EPSS score (0.00286) and absence from the CISA KEV catalog support the assessment of low active exploitation; however, the patch confidence of 2/4 suggests that exploit development could be pursued by researchers to validate or bypass the claimed fix.