Overview
Today, we’re discussing the recently discovered vulnerability CVE-2025-47884, which is a significant threat to systems utilizing Jenkins OpenID Connect Provider Plugin version 96.vee8ed882ec4d and earlier. This security flaw can allow attackers to impersonate trusted jobs and potentially gain unauthorized access to external services, leading to scenarios of data leakage or even complete system compromise. All organizations and individuals employing the affected versions of this plugin should be aware of this vulnerability, understand its impact, and apply necessary precautions to mitigate the risk.
Vulnerability Summary
CVE ID: CVE-2025-47884
Severity: Critical (CVSS 9.1)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Unauthorized access leading to potential system compromise or data leakage
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Product | Affected Versions
Jenkins OpenID Connect Provider Plugin | 96.vee8ed882ec4d and earlier
How the Exploit Works
The vulnerability arises from the generation of build ID Tokens in Jenkins OpenID Connect Provider Plugin. The plugin uses potentially overridden values of environment variables, and when paired with certain other plugins, attackers can craft a build ID Token that impersonates a trusted job. This exploit allows the attacker to bypass authentication and authorization processes, potentially gaining unauthorized access to external services linked to the system.
Conceptual Example Code
Given the nature of this vulnerability, a conceptual example would involve the attacker manipulating the environment variables to create a malicious build ID Token. The pseudocode could look something like this:
# Attacker alters environment variables
os.environ['JOB_NAME'] = 'trusted_job_name'
os.environ['BUILD_NUMBER'] = 'trusted_build_number'
# Attacker generates build ID Token using altered variables
malicious_token = generate_token(os.environ['JOB_NAME'], os.environ['BUILD_NUMBER'])
# Attacker now uses the malicious token for unauthorized access
response = requests.get('https://target.example.com/external_service', headers={'Authorization': malicious_token})Please note that this is a simplified conceptual example, and actual exploits might involve more complex methods and additional steps.
Mitigation Guidance
The recommended mitigation strategy is to apply the vendor patch as soon as it becomes available. If the patch is not yet released, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can offer temporary protection. The WAF or IDS should be configured to monitor and block suspicious activities involving the generation and usage of build ID Tokens. Furthermore, it is advisable to limit the privileges of users who can configure jobs, reducing the risk of attack from users with malicious intents.