CVE-2019-3803 : Security Advisory and Response

CVE-2019-3803, published on January 10, 2019, addresses a security vulnerability in Pivotal Concourse versions prior to 4.2.2. The vulnerability allows a malicious remote attacker to access user access tokens, potentially compromising user authentication.

Understanding CVE-2019-3803

This CVE entry highlights a critical security issue in Pivotal Concourse that could lead to unauthorized access and misuse of user access tokens.

What is CVE-2019-3803?

Pivotal Concourse versions before 4.2.2 expose user access tokens in the login flow URL, enabling attackers to retrieve tokens from browser history and impersonate users.

The Impact of CVE-2019-3803

The vulnerability poses a medium-severity risk with a CVSS base score of 4.5. Attackers with local access can exploit this flaw, potentially compromising user confidentiality and integrity.

Technical Details of CVE-2019-3803

This section delves into the specifics of the vulnerability affecting Pivotal Concourse.

Vulnerability Description

Pivotal Concourse versions prior to 4.2.2 disclose user access tokens in the login flow URL, facilitating unauthorized access and potential misuse by attackers.

Affected Systems and Versions

Product: Concourse
Vendor: Pivotal
Versions Affected: All versions before 4.2.2

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Local
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Vector String: CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

Mitigation and Prevention

To safeguard systems from CVE-2019-3803, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Upgrade Pivotal Concourse to version 4.2.2 or above to mitigate the vulnerability.
Monitor and restrict access to user access tokens to prevent unauthorized use.

Long-Term Security Practices

Implement secure authentication mechanisms to protect user credentials.
Regularly audit and review access token handling processes to identify and address security gaps.

Patching and Updates

Stay informed about security updates and patches released by Pivotal to address vulnerabilities like CVE-2019-3803.