CVE-2023-32759

Executive Summary

CVE-2023-32759 is an information disclosure vulnerability in the Archer Platform, a governance, risk management, and compliance (GRC) suite. An authenticated attacker can exploit a crafted URL to obtain sensitive information from the application. The vulnerability affects all versions prior to 6.13.0, with fixes available in 6.12.0.6 and 6.13.0. Given the CVSS score of 7.5 and the high confidentiality impact, successful exploitation could lead to exposure of sensitive business, compliance, or credential-related data.

Technical Analysis

The Archer Platform is a widely used GRC solution that centralizes an organization's risk, compliance, and audit data in a single repository. Because such platforms manage highly sensitive data — including security controls, audit findings, compliance posture, and internal risk assessments — an information disclosure flaw in this context carries an elevated risk.

According to the NVD description, CVE-2023-32759 is triggered when an authenticated attacker submits a crafted URL to the application. The flaw is present before version 6.13.0 and is addressed in maintenance release 6.12.0.6 and version 6.13.0.

The vulnerability class is information disclosure via improper handling of crafted URLs. In typical implementations, this class of vulnerability arises when the application fails to validate or normalize certain URL components — such as query parameters, path segments, or object identifiers — before using them to retrieve or render content. An authenticated attacker could manipulate these components to reference objects, records, or resources they are not authorized to view.

The NVD description does not provide function names, endpoint paths, or parameter names beyond the generic "crafted URL." Consequently, the exact mechanism (whether it results from path traversal, parameter injection, or access-control failure) cannot be confirmed from the supplied data. However, the consistent pattern for such issues in web-based GRC platforms involves the following:

1. The application maps URL segments or query parameters to internal data-access functions.
2. A sanitization or authorization-check step is either absent or improperly ordered.
3. The attacker modifies the URL to reference an object identifier or resource outside their permitted scope.
4. The application responds with the sensitive data normally unavailable to the authenticated user.

Attack surface: The vulnerability requires valid application credentials and network access to the Archer Platform web interface or a related service that processes URLs. Since authentication is required, this is an internal threat or a threat from an external actor with compromised credentials.

CVSS vector reflects the following characteristics: Network attack vector, Low attack complexity, Low privileges required, No user interaction, Unchanged scope, and High confidentiality impact. There is no integrity or availability impact.

Exploitation Scenarios

Prerequisites: Valid credentials for the Archer Platform. No public PoC or exploit code has been reported for this CVE; the attack chain below is inferred from the vulnerability class.

Step 1 — Reconnaissance/Target Identification: The attacker first identifies an exposed Archer Platform instance. This can be achieved via Shodan or other internet-scanning services using application-specific fingerprints, or through internal network recon. The attacker then authenticates with valid low-privileged credentials (e.g., a standard user account).

Step 2 — Crafted URL Manipulation: Leveraging authenticated access, the attacker constructs a URL that deviates from expected application patterns. Because the flaw is in URL handling, the attacker may:

• Enumerate common object IDs, record IDs, or file identifiers used in the platform's URL structure.
• Test URL variations that include data-access parameters or resource locators.

Step 3 — Vulnerability-Class Trigger: The crafted URL causes the application to access a resource outside the attacker's authorization boundary. The flaw allows the application to return content that should be restricted to higher-privileged roles. No code-level details (specific function names, endpoints, or parameter keys) are available; the attack is performed by submitting the manipulated URL directly to the application.

Step 4 — Post-Exploitation Impact: The attacker receives sensitive information in the application's response. Depending on the data reachable, this could include compliance reports, audit trails, internal risk assessments, or other restricted business data. This information can be used to further refine attacks, gain competitive advantage, or escalate privileges within the organization.

Impact Assessment

CVSS Score: 7.5 (High)

The CVSS vector indicates:

• Attack Vector: Network — the platform can be exploited remotely.
• Attack Complexity: Low — no special conditions are required beyond authentication.
• Privileges Required: Low — only an authenticated low-privileged user is needed.
• User Interaction: None — no victim action is required.
• Scope: Unchanged — impact is confined to the vulnerable component.
• Confidentiality: High — sensitive information is exposed.

Affected Systems: All versions of Archer Platform before 6.13.0, except those patched by 6.12.0.6.

Business Impact: The Archer Platform is a governance, risk, and compliance system. Data hosted on it frequently includes:

• Critical security control assessments
• Regulatory compliance artifacts (SOX, HIPAA, PCI-DSS, etc.)
• Internal and external audit findings
• Vendor risk assessments and third-party due diligence records
• Executive-level risk reporting

Exposure of such data could have regulatory, legal, and competitive consequences. The requirement for authentication reduces the immediate external attack surface, but compromised low-level credentials or malicious insiders represent the primary threat vectors.

Blast Radius: An attacker with low privileges could potentially access records and reports that span the entire GRC repository, depending on the platform's access-control architecture and the reachability of the flaw.

Detection Guidance

Sigma Rule

title: Archer Platform Crafted URL Information Disclosure Attempt
id: 9f3a7c21-8e5d-4f7a-9c6d-2b1f0e4a5c3d
status: experimental
description: Detects potential exploitation of CVE-2023-32759 via crafted URLs in Archer Platform web logs.
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2023-32759
author: Valters IT Security Team
date: 2024/01/15
logsource:
    category: webserver
    product: archer
detection:
    selection:
        cs-uri-query|contains:
            - '?'
        sc-status: 200
    filter_baseline:
        cs-uri-query|contains:
            - '/home'
            - '/login'
    condition: selection and not filter_baseline
level: medium
falsepositives:
    - Legitimate users navigating the application's standard interface
    - Automated scanning tools using default paths

YARA Rule

rule archer_platform_cve_2023_32759
{
    meta:
        author = "Valters IT Security Team"
        description = "Detects strings indicative of Archer Platform crafted URL exploitation attempts for CVE-2023-32759"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2023-32759"
        date = "2024/01/15"
        severity = "high"
    strings:
        $url_pattern = /(?:Archer|archer)[^\s]*\?[a-zA-Z0-9_=&%]{10,}/ nocase
        $error_indicator = "Access denied" ascii nocase
        $data_keyword = "fileId=" ascii nocase
        $data_keyword2 = "recordId=" ascii nocase
        $application_footer = "Archer Platform" ascii nocase
    condition:
        uint16(0) == 0x4D5A and
        (($url_pattern and ($data_keyword or $data_keyword2)) or
         ($error_indicator and $application_footer))
}

Suricata IDS Rule

alert http any any -> $HOME_NET any (msg:"Archer Platform CVE-2023-32759 Potential Information Disclosure Attempt"; flow:established,to_server; content:"GET"; http_method; content:"Archer"; http_uri; nocase; pcre:"/\?[a-zA-Z0-9_=%&]{10,}/iR"; reference:cve,2023-32759; reference:url,https://nvd.nist.gov/vuln/detail/CVE-2023-32759; classtype:attempted-info-leak; sid:20240701; rev:1; metadata:created_at 2024_01_15, updated_at 2024_01_15;)

Elastic Detection

// EQL query for Archer Platform crafted URL attempts
sequence by source.ip with maxspan=1m
  [ network where event.category == "web" and
    process.name == "httpd" and
    url.path contains "Archer" and
    length(url.query) > 10 ]
  [ network where event.category == "web" and
    http.response.status_code == 200 and
    network.direction == "egress" ]

Splunk SPL Query

index=web sourcetype=access_combined
| where like(uri_path, "%Archer%")
| eval query_len = len(uri_query)
| where query_len > 10
| stats count by src_ip, uri, uri_query, status
| sort - count

Wazuh OSSEC Rule

<group name="archer,">
  <rule id="100401" level="10">
    <decoded>Archer Platform web request</decoded>
    <match>Archer</match>
    <regex>GET \S+Archer\S+\?</regex>
    <description>Archer Platform: Potential crafted URL information disclosure attempt (CVE-2023-32759)</description>
    <group>web_application_attack,</group>
    <mitre>
      <id>T1555</id>
    </mitre>
  </rule>
</group>

Mitigation & Patch Guidance

Patch Confidence: 0/4 — UNPATCHED. No patch evidence from any tracked source.

The vendor has designated fixed versions (6.12.0.6 and 6.13.0) per the NVD record, but no explicit patch advisory, diff, or vendor confirmation is available in the provided data. Treat the fix information with caution and verify directly with Archer (now part of RSM Partners) before assuming patching resolves the issue.

Immediate Mitigations:

1. Restrict network access — Limit access to the Archer Platform to trusted networks/IP ranges only. Do not expose the platform directly to the internet unless absolutely necessary.
2. Monitor authenticated sessions — Review logs for anomalous URL patterns, especially URLs with excessively long query strings or unexpected parameters.
3. Enforce least privilege — Ensure all accounts, particularly service accounts, have the minimum level of access required for their function. Remove unnecessary high-privileged accounts.
4. Enable audit logging — Ensure comprehensive logging is enabled for all web requests to the platform.

Patch/Upgrade Steps:

1. Contact the vendor (Archer/RSM Partners) to obtain the confirmed fix details for versions 6.12.0.6 and 6.13.0.
2. Schedule an upgrade to 6.13.0 or apply the 6.12.0.6 hotfix in a staging environment first.
3. Verify the fix by retesting the original exploitation vector (submitting crafted URLs with different parameter/object references) before production rollout.

Long-Term Hardening:

1. Apply all subsequent vendor security patches on a regular cycle (monthly or quarterly) with a defined SLA.
2. Implement a web application firewall (WAF) in front of the platform with rule sets tuned for information disclosure patterns.
3. Enforce multi-factor authentication (MFA) for all user accounts to mitigate the risk of credential compromise.
4. Conduct regular penetration tests and code reviews focused on access-control and URL-handling logic for custom web applications.
5. Maintain an inventory of all data within the GRC platform and periodically re-certify user entitlements.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2023-32759 — Official National Vulnerability Database record providing the CVE description, CVSS score, and affected version details.
2. Archer (RSM Partners) Vendor Site: https://www.archerirm.com/ — Vendor portal for obtaining patch advisories and official documentation on security fixes.
3. CISA Known Exploited Vulnerabilities Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog — Confirmed that CVE-2023-32759 is NOT listed in the KEV catalog as of this report's writing; no evidence of exploitation in the wild.
4. FIRST CVSS Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N — Reference for the CVSS vector string used in this report.
5. MITRE ATT&CK — T1555: https://attack.mitre.org/techniques/T1555/ — Reference for the tactic and technique mapping used in the metadata section.

Campaign Note: No known threat actor campaigns, exploit-in-the-wild evidence, or public exploit code have been reported for this CVE at the time of writing. EPSS score of 0.00584 places this CVE in the 44.8th percentile of exploited CVEs, indicating a low but non-zero probability of exploitation in the near term.