CVE-2023-23460

Executive Summary

CVE-2023-23460 is a critical authentication bypass vulnerability in Priority Web version 19.1.0.68, an ERP web interface. The flaw stems from parameter manipulation on an unspecified endpoint, allowing a remote, unauthenticated attacker to bypass authentication mechanisms and gain unauthorized access to the application. With a CVSS score of 9.1, successful exploitation grants full compromise of the web application's data integrity and confidentiality. Organizations running the affected version should treat this as a high-priority remediation item despite the lack of public exploit code or CISA KEV listing.

Technical Analysis

The NVD description indicates that the vulnerability resides in the Priority Web application, version 19.1.0.68. The root cause is described as "parameter manipulation on an unspecified end-point," which is consistent with an authentication bypass vulnerability class where the server-side application fails to properly validate or sanitize authentication-related parameters passed via HTTP requests.

While the exact endpoint and parameter names are not disclosed in the NVD description, the class of vulnerability suggests one of the following mechanisms:

1. Client-side authentication state manipulation: The application may rely on client-supplied parameters (e.g., session tokens, user identifiers, or boolean flags in POST/GET bodies) to determine the authenticated state of a request. An attacker who can modify these parameters could effectively claim an authenticated session without valid credentials.

2. Insecure direct object reference (IDOR) on authentication flow: The authentication mechanism may trust a user-supplied identifier (such as a user ID or role parameter) that is passed to a server-side function during the login or session-establishment process. By altering this parameter, an attacker could assume the identity of another user, including an administrator.

3. Logic flaw in session handling: The application may accept a token or session identifier that can be predicted, brute-forced, or manipulated to produce a valid authenticated session state.

The attack surface is the HTTP interface exposed by Priority Web. As an ERP platform, this interface is typically reachable over the network, often from the internet or at least from broad internal segments, making it a prime target for both external and insider threats.

The lack of CWE identification and the sparse NVD description mean that the precise technical mechanism cannot be confirmed. However, authentication bypass vulnerabilities of this nature are frequently the result of missing server-side validation of parameters used in the authentication decision process. The CVSS vector — while not fully disclosed — combined with the 9.1 score indicates network-based exploitation with low attack complexity, no privileges required, and no user interaction, with high impacts on confidentiality and integrity (and potentially availability).

It is also worth noting that the vulnerability was disclosed for version 19.1.0.68 specifically; versions between 19.1.0.68 and 22.1 may also be affected, but this is not confirmed by the available data. The patch confidence is rated 2/4, meaning the fix is claimed by a single source (the CNA) but has not been independently verified.

Exploitation Scenarios

The following attack chain is inferred from the vulnerability class and the available data. No public PoC is available; the chain is described at the vulnerability-class level.

Step 1: Reconnaissance / Target Identification An attacker would first identify internet-facing or network-reachable instances of Priority Web. This can be done via Shodan queries (e.g., searching for "Priority Web" or related ERP fingerprints) or through standard network scanning of common web application ports. The attacker would then fingerprint the application version, confirming it is 19.1.0.68 or another potentially vulnerable build.

Step 2: Flaw Trigger — Parameter Manipulation The attacker would send HTTP requests to the application's authentication endpoint. Since the exact endpoint is unspecified in the NVD description, the attacker would likely enumerate typical authentication-related URLs (login pages, session initiation endpoints) and test how the application handles manipulated parameters. The core mechanism is the modification of parameters that the server trusts for authentication decisions — for example, altering a user ID field, a session flag, or an authentication bypass token.

Step 3: Payload / Execution Method At the class level, the attack involves submitting an HTTP request where one or more parameters that influence the authentication state are altered from their expected values. For example, if the application uses a hidden form field to indicate whether the user is pre-authenticated, setting this field to a truthy value may cause the server to grant access without valid credentials. Alternatively, if the application accepts a user identifier parameter, changing it to a known administrator ID could bypass the login check. The specifics depend on the application's logic, which is not detailed in the available data.

Step 4: Post-Exploitation Impact Once authentication is bypassed, the attacker gains access to the ERP web interface with elevated privileges — potentially administrative. This allows unauthorized access to sensitive business data (financial records, customer information, supply chain data), the ability to modify or delete records (integrity impact), and potentially to trigger further actions such as altering system configurations or pivoting to backend systems connected to the ERP.

Impact Assessment

CVSS Score: 9.1 (Critical) — The high score reflects the fact that the vulnerability is remotely exploitable without authentication, has low attack complexity, and leads to high confidentiality and integrity impact.

Business Impact:

• Data Breach: Unauthorized access to ERP data, including financial, customer, supply chain, and operational information. This could result in regulatory fines, reputational damage, and legal liability.
• Data Integrity: An attacker with write access could manipulate business records, leading to financial fraud, corrupted accounting data, or sabotaged operations.
• Operational Disruption: Depending on the privileges obtained, an attacker could disrupt business processes that rely on the ERP system.

Blast Radius:

• Directly affected: Priority Web instances running version 19.1.0.68.
• Indirectly affected: All business units and operational processes that depend on the ERP system, as well as downstream systems that integrate with it (e.g., databases, reporting tools, third-party APIs).
• The ERP's role as a central business system amplifies the blast radius — a compromise could affect multiple departments and potentially extend to the broader corporate network if the web server is not properly segmented.

Exploitation Status:

• No public PoC or exploit code is available; the CVE is not listed in CISA KEV.
• EPSS score of 0.00688 (49.3rd percentile) suggests a relatively low probability of exploitation in the wild, but this should not be interpreted as a low risk for a 9.1-severity vulnerability — the lack of public exploit details may temporarly suppress the EPSS score.

Detection Guidance

The following detections are designed to surface authentication bypass attempts based on the vulnerability class. Because the exact endpoint and parameter names are unknown, the rules focus on anomalous authentication behavior and parameter manipulation patterns rather than specific signature matches.

Sigma Rule

title: Suspicious Authentication Parameter Manipulation on Priority Web
id: d3f5c3a2-9b8e-4f6e-8d2a-1c5e7a9b2f4d
status: experimental
description: Detects potential authentication bypass attempts via parameter manipulation on Priority Web endpoints
author: Valtersit Threat Intelligence
logsource:
  category: webserver
  product: iis
detection:
  selection_unauth:
    c-uri|contains:
      - '/login'
      - '/auth'
      - '/session'
  selection_params:
    http_user_agent|contains: 'priority'
  filter_known_ips:
    c-ip|startswith: '10.0.0.'
  condition: selection_unauth and selection_params and not filter_known_ips
level: high
falsepositives:
  - Legitimate automated administrative tools
  - Internal monitoring solutions
tags:
  - attack.initial_access
  - attack.t1190
  - cve.2023.23460

YARA Rule

rule Priority_Web_AuthBypass_2023_23460 {
    meta:
        author = "Valtersit Threat Intelligence"
        description = "Detects suspicious HTTP request patterns associated with Priority Web authentication bypass (CVE-2023-23460)"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2023-23460"
        date = "2024-01-15"
        severity = "critical"
    strings:
        $s1 = "Priority" ascii wide nocase
        $s2 = "auth=" ascii wide nocase
        $s3 = "session=" ascii wide nocase
        $s4 = "userid=" ascii wide nocase
        $s5 = "role=" ascii wide nocase
    condition:
        any of them and filesize < 10KB
}

Suricata IDS Rule

alert http any any -> $HOME_NET any (
    msg:"ET EXPLOIT Priority Web Authentication Bypass Attempt (CVE-2023-23460)";
    flow:to_server,established;
    content:"Priority"; http_header; nocase;
    content:"POST"; http_method;
    content:"login"; http_uri; nocase;
    sid:202323460;
    rev:1;
    classtype:attempted-admin;
    reference:cve,2023-23460;
    metadata:created_at 2024_01_15, updated_at 2024_01_15;
)

Elastic Detection

sequence by source.ip with maxspan=1m
  [network where event.type == "connection" and destination.port == 443]
  [http where
     url.path contains "login" or url.path contains "auth" and
     user_agent.name == "*Priority*" and
     request.method == "POST" and
     // Look for unusual number of distinct parameters in a single request or repeated failed logins
     url.query matches ".*(session|userid|role)=.*" ]

Splunk SPL Query

index=web sourcetype="iis:log" OR sourcetype="apache*"
| where like(uri_path, "%login%") OR like(uri_path, "%auth%") OR like(uri_path, "%session%")
| rex field=user_agent "Priority"
| search user_agent="*Priority*"
| stats count by clientip, uri_path, status
| where count > 10
| eval alert = "Possible auth bypass attempt on Priority Web (CVE-2023-23460)"
| table _time, clientip, uri_path, status, count, alert

Wazuh OSSEC Rule

<group name="web,pci_dss_6.5.10,">
  <rule id="100345" level="10">
    <decoded_as>json</decoded_as>
    <field name="url">login|auth|session</field>
    <field name="user_agent">Priority</field>
    <description>Priority Web potential authentication bypass attempt (CVE-2023-23460)</description>
    <mitre>
      <id>T1190</id>
    </mitre>
    <group>cve-2023-23460</group>
  </rule>
</group>

Mitigation & Patch Guidance

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

1. Immediate Mitigations (if patch cannot be applied immediately)

• Network Restriction: Immediately restrict network access to Priority Web interfaces to only trusted IP ranges using firewall rules or network ACLs. If remote access is required, place the interface behind a VPN requiring multi-factor authentication.
• Web Application Firewall (WAF): Deploy or configure a WAF in front of Priority Web to monitor and block requests exhibiting anomalous authentication-related parameter manipulation.
• Enhanced Logging: Enable verbose logging on the web server and application, and monitor authentication-related endpoints for abnormal request patterns (e.g., multiple login attempts, unexpected parameters).
• Access Review: Temporarily disable or restrict high-privilege accounts and audit existing sessions for any signs of unauthorized access.

2. Patch / Upgrade Steps

• Apply the vendor fix: Upgrade Priority Web to version 22.1, as claimed by the CNA. Even though patch confidence is moderate, this is the only known remediation.
• Validate the patch: After upgrade, verify the application version and run functional and security regression tests to confirm the authentication bypass is resolved. Independently test authentication flows with manipulation attempts where feasible.
• Monitor for advisories: Watch the Priority vendor advisory channels for further clarification or additional patches for intermediate versions (e.g., 20.x, 21.x) that may also be affected.

3. Long-Term Hardening

• Asset Inventory: Maintain an accurate inventory of all Priority Web instances and their versions, prioritizing patching of internet-facing systems first.
• Principle of Least Privilege: For ERP web interfaces, implement strict access control policies. Deploy MFA for all user accounts, especially administrative roles.
• Security Testing: Include Priority Web in regular penetration testing and vulnerability scanning cadence. Given the sparse details of this CVE, request the vendor for a full technical disclosure to enable deeper testing.
• Network Segmentation: Isolate the ERP web tier from the broader corporate network and backend systems; enforce strict egress and ingress rules.
• Incident Response Preparedness: Update playbooks to include authentication bypass scenarios; ensure logs are retained for at least 90 days for forensic purposes.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2023-23460 — Official NVD record containing the description and score.
2. CNA Advisory: Priority vendor advisory (referenced via CNA) — the single source claiming the fix in version 22.1. Direct URL not publicly available.
3. MITRE ATT&CK: https://attack.mitre.org/techniques/T1190/ — Exploit Public-Facing Application technique applicable to this vulnerability.
4. FIRST EPSS: https://www.first.org/epss/ — EPSS score database for exploitation probability context.
5. CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog — Checked; CVE-2023-23460 is NOT listed (as of report date).

Threat Actor Campaigns / Exploit-in-the-Wild Evidence: No known threat actor campaigns or active exploitation in the wild have been reported for this CVE. The absence of public PoCs, the moderate EPSS percentile, and the lack of CISA KEV listing suggest exploitation is currently unlikely, but the high CVSS score warrants proactive mitigation.