CVE-2024-4556

Executive Summary

CVE-2024-4556 is a path traversal vulnerability in OpenText NetIQ Access Manager, a widely deployed identity and access management solution. The flaw allows an unauthenticated attacker to read arbitrary files on the server, potentially exposing sensitive configuration data, credentials, or other secrets. The vulnerability exists in versions before 5.0.4 and before 5.1. The CVSS score is 5.7 (Medium), and the EPSS probability is 0.0%, indicating low active exploitation in the wild. No public proof-of-concept or exploit code is available at this time.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Base Score: 5.7 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: Low (C:L)
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)

The threat level is Medium. While the vulnerability is easy to exploit remotely without authentication, the impact is limited to information disclosure. However, the exposed data could be leveraged for further attacks.

Deep Dive & Mechanics

The vulnerability is a classic path traversal (CWE-22) in the NetIQ Access Manager web interface. The application fails to properly sanitize user-supplied input used to construct file paths. An attacker can inject directory traversal sequences (e.g., ../) to escape the intended web root and read arbitrary files on the server filesystem.

Attack Vector:

• The attacker sends a crafted HTTP request to a vulnerable endpoint, likely one that serves static files or configuration data.
• The request includes a path parameter containing ../ sequences.
• The server processes the request without validation, returning the contents of the requested file.

Potential Impact:

• Exposure of configuration files (e.g., accessmanager.conf, server.xml).
• Leakage of database credentials, LDAP bind passwords, or SSL private keys.
• Disclosure of internal network topology or other sensitive system information.

Vulnerable vs. Patched Code

The vulnerable code likely uses a function like File.ReadAllText() or Path.Combine() without proper validation. The patched version introduces a check to ensure the resolved path stays within an allowed base directory.

Vulnerable (pseudo-code):

string filePath = Request.QueryString["file"];
string content = File.ReadAllText(filePath);
Response.Write(content);

Patched (pseudo-code):

string basePath = Server.MapPath("~/public");
string filePath = Request.QueryString["file"];
string fullPath = Path.GetFullPath(Path.Combine(basePath, filePath));
if (!fullPath.StartsWith(basePath))
{
    throw new SecurityException("Invalid path.");
}
string content = File.ReadAllText(fullPath);
Response.Write(content);

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Deploy a vulnerable instance of NetIQ Access Manager (version < 5.0.4 or < 5.1) in a controlled environment.
2. Identify the vulnerable endpoint (e.g., /files?path=... or /static?file=...).

Exploitation Steps:

1. Send a crafted request to read /etc/passwd:

   GET /files?path=../../../etc/passwd HTTP/1.1
   Host: target.example.com
   

2. If successful, the server will return the contents of the file.
3. Attempt to read configuration files:

   GET /files?path=../../../opt/netiq/accessmanager/conf/server.xml HTTP/1.1
   

Note: No public exploit code is available. The above is a generic example based on the vulnerability type.

Blue Team

Detection:

• Monitor for HTTP requests containing ../ or ..%2f in path parameters.
• Alert on attempts to access files outside the web root (e.g., /etc/, /proc/, /opt/).
• Use WAF rules to block path traversal patterns.

Hunting:

• Search web server logs for requests with multiple ../ sequences.
• Look for responses containing sensitive file headers (e.g., root:x:0:0: for /etc/passwd).

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests with path traversal sequences (../, ..%2f, %2e%2e%2f).
  • Requests to endpoints like /files, /static, /download, or /getfile.
  • Responses containing sensitive file contents (e.g., /etc/passwd, configuration files).

• File System IOCs:

  • Unexpected access to files outside the web root (e.g., /etc/shadow, /opt/netiq/accessmanager/conf/).

• Log IOCs:

  • Web server logs showing 404 or 200 responses for path traversal attempts.
  • Error logs indicating file read failures or permission denied errors.

Detection Engineering

YARA Rule

rule CVE_2024_4556_Path_Traversal {
    meta:
        description = "Detects path traversal attempts targeting NetIQ Access Manager"
        author = "Valters IT"
        date = "2024-10-27"
        reference = "CVE-2024-4556"
    strings:
        $traversal1 = "../"
        $traversal2 = "..\\"
        $traversal3 = "%2e%2e%2f"
        $traversal4 = "%2e%2e/"
        $sensitive1 = "/etc/passwd"
        $sensitive2 = "/etc/shadow"
        $sensitive3 = "/opt/netiq/"
    condition:
        any of ($traversal*) and any of ($sensitive*)
}

Sigma Rule

title: CVE-2024-4556 Path Traversal Attempt
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects path traversal attempts in HTTP requests to NetIQ Access Manager
author: Valters IT
date: 2024-10-27
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains:
            - '../'
            - '..\\'
            - '%2e%2e%2f'
            - '%2e%2e/'
    condition: selection
falsepositives:
    - Legitimate use of relative paths in some applications
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-4556 Path Traversal Attempt"; flow:to_server,established; content:"../"; http_uri; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade to NetIQ Access Manager version 5.0.4 or 5.1.
2. If immediate patching is not possible, implement a WAF rule to block path traversal patterns.
3. Restrict file system permissions to limit the impact of successful exploitation.

Long-term Measures:

• Conduct a security review of all file handling endpoints.
• Implement input validation and canonicalization for all file paths.
• Use a chroot jail or containerization to isolate the application.

Valters IT Signature This report was generated by Valters IT Cyber Threat Intelligence. For questions, contact intelligence@valters-it.com.