CVE-2024-20345: Cisco AppDynamics Path Traversal Flaw

CVE-2024-20345 Overview

A directory traversal vulnerability exists in the file upload functionality of Cisco AppDynamics Controller that could allow an authenticated, remote attacker to access sensitive data on affected devices. This vulnerability stems from insufficient validation of user-supplied input during file upload operations, enabling attackers to craft malicious requests that traverse directory structures and access files outside the intended scope.

Critical Impact

Authenticated attackers can exploit this path traversal flaw to access sensitive configuration files, credentials, and other confidential data stored on the AppDynamics Controller, potentially compromising the entire application monitoring infrastructure.

Affected Products

• Cisco AppDynamics Controller (all vulnerable versions)
• Cisco Application Performance Monitoring environments using AppDynamics Controller
• Enterprise deployments utilizing Cisco AppDynamics for application visibility

Discovery Timeline

• 2024-03-06 - CVE-2024-20345 published to NVD
• 2025-09-30 - Last updated in NVD database

Technical Details for CVE-2024-20345

Vulnerability Analysis

This directory traversal vulnerability (CWE-26) affects the file upload functionality within Cisco AppDynamics Controller. The core issue lies in the application's failure to properly sanitize and validate user-supplied file paths during upload operations. When processing file upload requests, the controller accepts path parameters that can include directory traversal sequences such as ../ or encoded variants, allowing attackers to escape the intended upload directory.

The vulnerability requires authentication to exploit, meaning an attacker must first obtain valid credentials for the AppDynamics Controller. Once authenticated, the attacker can manipulate file path parameters in upload requests to read arbitrary files from the underlying system. This can lead to exposure of sensitive configuration data, database credentials, API keys, and other confidential information stored on the controller.

The attack is network-accessible and requires no user interaction, making it exploitable by any authenticated user with access to the file upload functionality.

Root Cause

The root cause of CVE-2024-20345 is insufficient input validation in the file upload handler of Cisco AppDynamics Controller. The application fails to properly sanitize user-controlled path components before processing file operations. Specifically:

• The file upload endpoint accepts user-supplied file names or path parameters without adequate validation
• Directory traversal sequences (../, ..\\, and URL-encoded equivalents like %2e%2e%2f) are not filtered or blocked
• Path canonicalization is not performed to resolve relative path components before file access
• The application lacks proper chroot or sandboxing to restrict file access to authorized directories

Attack Vector

The attack vector involves sending specially crafted HTTP requests to the file upload endpoint of the AppDynamics Controller. An authenticated attacker constructs a request containing directory traversal sequences in file path parameters, enabling navigation outside the intended upload directory to access sensitive system files.

The attack sequence typically involves:

1. Authenticating to the AppDynamics Controller with valid credentials
2. Identifying the vulnerable file upload endpoint
3. Crafting a malicious request with path traversal sequences (e.g., ../../../../etc/passwd or ..\..\..\..\windows\system32\config\sam)
4. Submitting the request to read arbitrary files from the server filesystem
5. Extracting sensitive data from the response

Since no verified code examples are available, refer to the Cisco Security Advisory for specific technical details regarding the vulnerable endpoints and exploitation mechanics.

Detection Methods for CVE-2024-20345

Indicators of Compromise

• HTTP requests to file upload endpoints containing directory traversal sequences such as ../, ..\\, %2e%2e%2f, or %2e%2e/
• Unusual file access patterns in AppDynamics Controller logs showing attempts to read files outside the application directory
• Failed authentication attempts followed by successful logins and immediate file upload activity
• Access logs showing requests with encoded path traversal characters targeting upload handlers

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block requests containing directory traversal patterns in file upload parameters
• Enable detailed logging on the AppDynamics Controller and monitor for suspicious file path patterns in upload requests
• Implement intrusion detection system (IDS) signatures to alert on path traversal attempts targeting Cisco AppDynamics endpoints
• Review application logs for HTTP 200 responses to requests containing ../ or encoded traversal sequences

Monitoring Recommendations

• Monitor AppDynamics Controller access logs for anomalous file upload activity from authenticated users
• Set up alerts for any file access attempts outside the designated upload directories
• Implement file integrity monitoring (FIM) on sensitive configuration files that could be targeted via path traversal
• Track authentication events correlated with subsequent file upload operations for behavioral analysis

How to Mitigate CVE-2024-20345

Immediate Actions Required

• Review the Cisco Security Advisory and apply the recommended security patch immediately
• Audit user accounts with access to the AppDynamics Controller and revoke unnecessary privileges
• Implement network segmentation to limit access to the AppDynamics Controller management interface
• Enable enhanced logging on the controller to detect any exploitation attempts

Patch Information

Cisco has released security updates to address this vulnerability. Administrators should consult the Cisco Security Advisory (cisco-sa-appd-traversal-m7N8mZpF) for specific patch versions and upgrade instructions. Organizations should prioritize patching based on the exposure of their AppDynamics Controller deployments and implement the update during the next maintenance window.

Workarounds

• Restrict network access to the AppDynamics Controller to only trusted administrator IP addresses or networks using firewall rules
• Implement a reverse proxy or WAF in front of the controller configured to reject requests containing path traversal patterns
• Review and minimize the number of user accounts with file upload privileges on the AppDynamics Controller
• Consider temporarily disabling file upload functionality if not operationally required until the patch can be applied

# Example WAF rule to block directory traversal attempts
# Add to your web application firewall configuration
SecRule REQUEST_URI|ARGS|ARGS_NAMES "@contains ../" \
    "id:1001,\
    phase:1,\
    deny,\
    status:403,\
    msg:'Directory traversal attempt blocked',\
    logdata:'Matched Data: %{MATCHED_VAR} found within %{MATCHED_VAR_NAME}'"