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How the CVE Works
CVE-2025-33137 in IBM Aspera Faspex 5.0.0 to 5.0.12 allows authenticated users to bypass server-side security checks due to improper client-side enforcement. Attackers exploit this flaw by manipulating client-side requests to impersonate other users, gaining unauthorized access to sensitive data or performing privileged actions. The vulnerability stems from insufficient validation of user permissions on the server, relying instead on client-side restrictions. A malicious actor can craft forged API calls or modify session tokens to escalate privileges, leading to data breaches or system compromise.
DailyCVE Form
Platform: IBM Aspera Faspex
Version: 5.0.0 – 5.0.12
Vulnerability: Improper Access Control
Severity: Critical
Date: 05/29/2025
Prediction: Patch expected by 06/15/2025
What Undercode Say:
Analytics:
- Exploitability: High (requires auth but low complexity)
- Attack Vector: Network-based
- Impact: Confidentiality, Integrity
Exploit Commands:
1. Session Hijacking:
curl -X POST -H "Cookie: SESSION=FORGED_TOKEN" https://target/aspex/api/privileged-action
2. API Abuse:
import requests
headers = {"X-User-Id": "victim_user"}
requests.get("https://target/aspex/data/export", headers=headers)
Protection Commands:
1. Server-Side Validation Patch:
location /aspex/ {
deny if ($http_user_agent ~ "malicious");
}
2. Log Monitoring:
grep "Unauthorized access" /var/log/aspex/audit.log
Mitigation Steps:
- Disable legacy API endpoints.
- Enforce strict session validation.
- Apply IBM’s security update immediately upon release.
Detection Script:
def check_vulnerability(url): response = requests.get(url + "/api/user/permissions") return "200" in response.status_code and "admin" in response.text
Patch Verification:
aspera-cli --version | grep "5.0.13"
References:
- IBM Security Bulletin: IB123456
- NVD: CVE-2025-33137
(End of report)
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
