CVE-2022-4779

Executive Summary

CVE-2022-4779 is an authentication bypass vulnerability affecting Elvexys StreamX applications from versions 6.02.01 through 6.04.34. The flaw exists in installations using the StreamView HTML component with the public web server feature activated, where a logic bug allows unauthenticated remote attackers to bypass the implemented authentication scheme. Successful exploitation grants unauthorized access to the StreamX application and its associated data, with a CVSS score of 7.5 (High severity) reflecting the ease of exploitation and confidentiality impact.

Technical Analysis

The vulnerability is classified as a logic bug within the authentication mechanism of StreamX applications. Based on the NVD description, the flaw specifically manifests when the StreamView HTML component is deployed in conjunction with the public web server feature. This configuration exposes the application to unauthenticated network access by design, yet the intended authentication layer fails to properly enforce access controls.

The vulnerability class here is authentication bypass — the application's security logic fails to correctly validate user identity or session state, allowing requests to reach protected resources without proper credential verification. The "logic bug" phrasing suggests the issue is not a memory corruption flaw (like a buffer overflow) nor an injection vulnerability, but rather a flaw in the application's control flow — possibly an incorrect conditional statement, an improperly ordered authentication check, or a race condition in session validation.

The affected version range (6.02.01 to 6.04.34) indicates the bug was introduced at some point in the 6.02.x release line and persisted through the 6.04.34 release. The attack surface is the public web server component, meaning any StreamX system deployed with this feature enabled is exposed to the internet or at least to the network segment where the web server listens.

Insufficient technical detail is available in the public advisory to identify specific code-level constructs, function names, or the exact logic flaw. The NVD description does not reveal whether the bypass affects authentication at the application level, the session management layer, or the web server's access control mechanism. Analysts should treat this as a generic authentication bypass affecting exposed management interfaces, with the specific exploitation technique pending further disclosure or independent research.

The CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) confirms the threat model: network-exploitable, low attack complexity, no privileges required, no user interaction needed. The primary impact is confidentiality — unauthorized data access — with no direct integrity or availability impact per the CVSS subscores.

Exploitation Scenarios

The attack chain for CVE-2022-4779 is inferred from the vulnerability class, as no public PoC or exploit code is available. The scenario is reconstructed strictly from the NVD description and CVSS metrics.

Step 1 — Reconnaissance / Target Identification: The attacker scans for internet-exposed StreamX applications using the StreamView HTML component. Since the public web server feature must be activated for the vulnerability to be reachable, the target surface is limited to deployments with this feature enabled. Shodan queries targeting StreamX banners or web interface fingerprints would identify candidate systems.

Step 2 — Triggering the Authentication Bypass: The attacker sends crafted HTTP requests to the StreamX web interface. Because the vulnerability is a logic bug in the authentication scheme, the initial access requires no credentials. The exact request sequence is unknown without public technical details, but at the vulnerability-class level, the attacker would manipulate authentication-related parameters, session tokens, or request headers to cause the application's logic to believe the request is already authenticated.

No public PoC available; attack chain is inferred from vulnerability class — the authentication bypass likely involves either: (a) directly accessing protected endpoints that fail to invoke the authentication check, (b) manipulating a boolean or state variable that controls access, or (c) supplying a malformed request that causes the authentication routine to terminate prematurely with a success status.

Step 3 — Payload / Execution Method (Vulnerability-Class Level): At the vulnerability-class level, the attacker exploits the logic flaw to access application resources that should require authentication. In the context of a StreamX deployment (which is used in industrial/SCADA-type environments for streaming and monitoring applications), this could mean accessing configuration views, operational data streams, or administrative functions. The attacker does not need to deliver a payload in the traditional sense — the "payload" is the malformed authentication request itself.

Step 4 — Post-Exploitation Impact: Upon successful authentication bypass, the attacker gains unauthorized read access to StreamX application data. The CVSS confidentiality subscore (likely C:H per the vector) indicates significant information disclosure. In an OT/SCADA context, this could expose operational parameters, system configurations, or process data — potentially informing further attack planning against industrial control systems. No direct RCE or data modification capability is implied by the CVSS metrics (no I or A impact), suggesting the bypass primarily enables data theft rather than system compromise.

Impact Assessment

The business impact of CVE-2022-4779 is primarily centered on unauthorized information disclosure in StreamX deployments. StreamX is a product designed for streaming data applications, commonly found in operational technology (OT) and industrial environments where real-time data monitoring is critical.

CVSS Breakdown (Score: 7.5, High severity):

• Attack Vector: Network (AV:N) — remotely exploitable
• Attack Complexity: Low (AC:L) — no special conditions required
• Privileges Required: None (PR:N) — fully unauthenticated
• User Interaction: None (UI:N) — no victim action needed
• Confidentiality Impact: High (C:H) — significant data exposure
• Integrity Impact: None (I:N) — no data modification
• Availability Impact: None (A:N) — no denial of service

Affected Systems: Any StreamX application running version 6.02.01 through 6.04.34 with the StreamView HTML component and public web server feature enabled. Organizations that have restricted network access to these interfaces are less exposed, but the vulnerability is still exploitable within the network segment where the server is reachable.

Blast Radius: The blast radius is moderate — the EPSS score (0.01194, 65.1 percentile) suggests exploitation activity is not yet widespread, and the CVE is not listed on CISA's Known Exploited Vulnerabilities catalog, indicating no confirmed in-the-wild exploitation as of the report date. However, the low attack complexity and no-privileges-required profile make this an attractive target once knowledge of the exploit mechanism spreads. The lack of public PoC is a mitigating factor but should not be relied upon for risk acceptance.

For OT environments, the impact is amplified because a compromise of the StreamX data plane could expose sensitive operational data that could be used for targeted physical-world attacks — a concern for critical infrastructure operators who are increasingly targeted by APT groups.

Detection Guidance

Sigma Rule

title: Suspicious Unauthenticated Access to StreamX StreamView Endpoints
id: 7c3f9a2e-5b1d-4e8f-9c4a-3d2b1e0f6a5c
status: experimental
description: Detects potential authentication bypass attempts targeting StreamX StreamView HTML component (CVE-2022-4779) by identifying unauthenticated requests to protected StreamX endpoints.
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2022-4779
author: Valtersit Threat Intel Team
date: 2024/01/15
logsource:
    category: webserver
    product: apache
    definition: 'Web server logs from StreamX deployments running affected versions'
detection:
    selection_auth_fail:
        cs-method:
            - 'GET'
            - 'POST'
        cs-uri-query|contains:
            - '/streamview'
            - '/StreamView'
            - '/auth'
            - '/login'
        sc-status:
            - 200
            - 302
    selection_no_auth_header:
        cs-username|contains: '-'
    filter_known_good:
        sc-status: 401
    condition: selection_auth_fail and selection_no_auth_header and not filter_known_good
level: high
falsepositives:
    - Legitimate users accessing StreamView without explicit authentication headers if SSO is configured
    - Internal monitoring tools that fetch StreamX pages
tags:
    - attack.initial_access
    - attack.t1190
    - cve.2022-4779

YARA Rule

rule CVE_2022_4779_StreamX_AuthBypass_Suspicious_Requests
{
    meta:
        author = "Valtersit Threat Intel Team"
        description = "Detects HTTP requests containing patterns consistent with authentication bypass attempts against StreamX StreamView (CVE-2022-4779)"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2022-4779"
        date = "2024/01/15"
        score = 60
    strings:
        $s1 = "/StreamView" ascii wide nocase
        $s2 = "/streamview" ascii wide nocase
        $s3 = "X-Auth-Token" ascii wide nocase
        $s4 = "Authorization: Basic" ascii wide nocase
        $s5 = "username=" ascii wide nocase
        $s6 = "password=" ascii wide nocase
        $s7 = "session_id=" ascii wide nocase
    condition:
        any of ($s1, $s2) and 1 of ($s3, $s4, $s5, $s6, $s7)
}

Note: The YARA rule targets network traffic capturing HTTP/HTTPS requests to StreamX endpoints with authentication parameters. Since no specific exploit signatures are public, this rule focuses on identifying malicious authentication attempts to the StreamView component.

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2022-4779 - Potential StreamX StreamView Authentication Bypass Attempt"; flow:established,to_server; content:"GET"; http_method; content:"/StreamView"; http_uri; nocase; content:"|0d 0a|"; pcre:"/^Authorization: Basic\s+(?!)=/mi"; reference:cve,2022-4779; classtype:attempted-admin; sid:20224779; rev:1; metadata:created_at 2024_01_15, updated_at 2024_01_15;)

Note: This rule triggers on HTTP GET requests to the StreamView URI that include a Basic Authorization header, which is a common vector for authentication bypass attempts. Adjust the destination ports (typically 80/443) using flowbit or port filters to reduce noise.

Elastic Detection

detection_rule = """
query:
  - match:
      'url.path': '/StreamView'
  - match:
      'http.request.method': 'GET'
  - terms:
      'http.response.status_code': [200, 302]
  - range:
      'source.port': {gte: 1024}
  - match:
      'user_agent.name': '*'
  - missing:
      field: 'user.name'
"""

Note: This EQL rule identifies requests to the StreamView endpoint that return successful status codes without a corresponding authenticated user context. Adjust the index pattern to match your HTTP/web server logs (e.g., filebeat-*). Use the following in Kibana Search API with a proper index pattern.

Splunk SPL Query

index=web sourcetype=access_combined status IN (200, 302) 
| where like(uri_path, "%StreamView%") 
| eval has_auth = if(isnull(user) OR user == "-", "false", "true")
| where has_auth == "false"
| stats count by src_ip, uri_path, status, _time
| sort - count
| table _time, src_ip, uri_path, status, count

Note: This SPL query identifies successful (200/302) accesses to StreamView paths where no authenticated user is present in the logs. For Splunk Enterprise Security, consider converting this into a correlation search with a severity mapping based on source IP reputation.

Wazuh OSSEC Rule

<group name="CVE-2022-4779,streamx,">
  <rule id="852011" level="12">
    <if_sid>31550</if_sid>
    <field name="url">\.*StreamView.*</field>
    <field name="status">200|302</field>
    <description>CVE-2022-4779: StreamX StreamView authentication bypass - successful unauthenticated access to protected endpoint</description>
    <options>no_full_log</options>
    <group>attack.initial_access,</group>
  </rule>
  <rule id="852012" level="8">
    <if_sid>31550</if_sid>
    <field name="url">\.*StreamView.*</field>
    <field name="status">!401</field>
    <description>CVE-2022-4779: StreamX StreamView authentication bypass - repeated unauthenticated access attempts</description>
    <group>attack.reconnaissance,</group>
  </rule>
</group>

Note: Rule 31550 is the base Apache web server rule in Wazuh. Adjust the if_sid to match your web server log decoder (e.g., for Nginx use the appropriate group). Ensure your Wazuh manager has a web server log decoder enabled for StreamX.

Mitigation & Patch Guidance

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

NVD data indicates the vendor (listed as NCSC.ch in the CVE metadata, though this may be the coordinating CNA rather than the product vendor — the actual vendor is Elvexys) has released a fix. The recommended remediation is upgrading StreamX to version 6.04.35 or above, which is claimed to resolve the authentication bypass. However, this fix has not been independently verified by third-party researchers, and the patch details are limited to the CNA's assertion.

Immediate Mitigations (until patching is complete):

1. Disable the public web server feature on StreamView HTML components if not strictly required for operations. Since the vulnerability requires this feature to be activated, removing it eliminates the attack surface.
2. Restrict network access to StreamX web interfaces. Apply egress/ingress ACLs and firewall rules to limit access to trusted IP ranges only. Remove any internet-facing NAT/port-forward rules for the StreamView web port.
3. Place StreamX behind a reverse proxy with additional authentication (e.g., mutual TLS, VPN, or identity-aware proxy) to add a layer of defense beyond the application's native authentication.
4. Monitor web server logs for unauthenticated successful requests to StreamView endpoints, using the detection rules provided above.
5. If the system is internet-exposed, consider taking it offline until patching is complete, or apply a WAF rule to block requests to StreamView paths lacking valid authentication tokens.

Patch / Upgrade Steps:

1. Verify the current version of StreamX in your environment. If it is within the affected range (6.02.01 to 6.04.34), schedule an upgrade.
2. Obtain the patched version (6.04.35) from the vendor (Elvexys) via official support channels. Confirm the release notes and checksum authenticity.
3. Test the upgrade in a staging environment before production deployment, especially if StreamX is integrated with OT/SCADA systems where downtime planning is critical.
4. Apply the upgrade following vendor documentation. Post-upgrade, verify the authentication bypass is resolved by testing unauthenticated access attempts from a non-trusted network.
5. If the patch cannot be applied in the short term (e.g., OT environments with change windows), prioritize the immediate mitigations listed above and document the risk acceptance.

Long-Term Hardening:

1. Adopt a least-privilege model for all OT application access — no application should be directly internet-exposed without an intermediary authentication layer.
2. Segment OT and IT networks to prevent an attacker who compromises the web tier from pivoting to control-system networks.
3. Establish a vulnerability management program for OT software, including regular CVE monitoring and rapid patch testing in air-gapped environments.
4. Enable logging and centralized SIEM correlation for all StreamX components to ensure future detection capability.
5. Engage with the vendor to obtain the full vulnerability advisory and confirm the fix's completeness — the 2/4 patch confidence rating warrants independent verification.

References

1. NVD Entry — https://nvd.nist.gov/vuln/detail/CVE-2022-4779 Official NVD record with the vulnerability description, CVSS score (7.5), and affected version range.

2. CISA Known Exploited Vulnerabilities Catalog — https://www.cisa.gov/known-exploited-vulnerabilities-catalog (Relevant note: CVE-2022-4779 is NOT listed, indicating no confirmed in-the-wild exploitation at the time of this report.)

3. First.org CVSS Calculator — https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Reference for the CVSS v3.1 vector used in this report.

4. Elvexys (Vendor) — https://www.elvexys.com/ Vendor website; specific advisory URL not available in the NVD data. Seek the vendor advisory through official support channels for the 6.04.35 fix details.

5. EPSS (Exploit Prediction Scoring System) — https://www.first.org/epss/ Reference for the EPSS score (0.01194, 65.1 percentile) indicating low near-term exploitation likelihood, as of the report date.

No known threat actor campaigns or exploit-in-the-wild evidence have been publicly documented for CVE-2022-4779 as of the time of this report. The vulnerability is not present in the CISA KEV catalog, and no PoC or exploit code is publicly available. Organizations should monitor vendor advisories and public security research for updates, as the patch confidence of 2/4 indicates the fix's completeness is not yet independently verified.