CVE-2022-2782 - Octopus Server Indefinite Session Token Validation Vulnerability

CVE-2022-2782 is a security vulnerability in Octopus Server that allows a session token to remain valid indefinitely due to improper session token parameter validation. Octopus Server, a popular deployment automation tool, offers developers a secure and efficient way to manage and deploy software applications. However, this vulnerability can affect the security and efficiency of the software deployment by allowing unauthorized access to sensitive data or operations. In this blog post, we are going to explore the details of CVE-2022-2782, including an explanation of the vulnerability, affected versions, code snippets, links to original references, and possible exploit scenarios.

Description

The essence of the CVE-2022-2782 vulnerability lies in the improper validation of the session token parameters inside the Octopus Server. A session token is a crucial element ensuring the security and integrity of data transfer between the server and clients within a specified time range. When this session token is not validated correctly, it can remain valid indefinitely, opening the door for potential attacks, unauthorized access, and data breaches within the software deployment process.

Affected Versions

This vulnerability impacts specific versions of Octopus Server. If you are using an affected version, it is critical to update your system as soon as possible to mitigate the risks associated with this vulnerability. Here are the affected versions:

Code Snippet

The vulnerability exists due to problematic session token validation, which we can demonstrate with a simple pseudo-code snippet. The following example represents a faulty validation of the token parameters:

def validate_session_token(token, expiration):
    token_age = current_time - token.creation_time

    if token_age > expiration: 
        return False # Token should be expired
    else:
        return True # Token should be valid

# Incorrectly validate a session token
token = generate_session_token()
validate_session_token(token, None) # Returns True, regardless of the token's age

The issue arises when the expiration parameter is not correctly verified inside this function. If the parameter is absent or severely misconfigured, such as in cases where it takes a None value or has improper formatting, the token will be considered valid indefinitely by the system.

Exploit Details

An attacker could exploit CVE-2022-2782 by manipulating a token to be valid indefinitely. They could do so either by crafting a token with no expiration value or by forging an existing token and manipulating the expiration parameters. Once the attacker has an indefinite session token, they can use the token to gain unauthorized and potentially prolonged access to sensitive data or operations within the Octopus Server environment.

Solution and References

The exact functionality and implementation of the Octopus Server are not included in this post due to proprietary and security reasons. However, the developers have patched the vulnerability in the latest Octopus Server versions. To protect your system from CVE-2022-2782, ensure that you update your Octopus Server to the latest release. You can find more information about this vulnerability as well as suggested mitigation steps in the official Octopus Deploy documentation here:

- Octopus Deploy Release Notes
- CVE-2022-2782 Vulnerability Details

Conclusion

CVE-2022-2782 is a critical security vulnerability in the affected versions of Octopus Server that can lead to unauthorized access and potential data breaches due to improper session token validation. It is essential for developers using Octopus Server to be aware of this vulnerability and take the necessary steps to update their server as soon as possible. Keep your software up to date, and always monitor the latest security announcements to maintain a secure and efficient deployment process.

Timeline

Published on: 10/27/2022 10:15:00 UTC
Last modified on: 10/28/2022 19:41:00 UTC