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CVE-2021-2034

8.2 HIGH

📋 TL;DR

This vulnerability in Oracle Common Applications Calendar allows unauthenticated attackers to access sensitive data or modify information via HTTP requests. It affects Oracle E-Business Suite versions 12.1.1 through 12.1.3 and requires user interaction to exploit.

💻 Affected Systems

Products:
  • Oracle Common Applications Calendar
  • Oracle E-Business Suite
Versions: 12.1.1-12.1.3
Operating Systems: All platforms running Oracle E-Business Suite
Default Config Vulnerable: ⚠️ Yes
Notes: Affects the Tasks component specifically; requires network access via HTTP and human interaction from a user other than the attacker.

📦 What is this software?

Common Applications Calendar by Oracle

View all CVEs affecting Common Applications Calendar →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete compromise of all Oracle Common Applications Calendar data including unauthorized access to critical information and ability to modify, insert, or delete data across connected systems.

🟠

Likely Case

Unauthorized access to sensitive calendar and task data, potentially including confidential business information and user details.

🟢

If Mitigated

Limited impact with proper network segmentation, strong authentication controls, and user awareness training about suspicious interactions.

🌐 Internet-Facing: HIGH
🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

Easily exploitable according to Oracle's assessment; requires social engineering or user interaction to trigger the vulnerability.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Apply Critical Patch Update for January 2021 or later

Vendor Advisory: https://www.oracle.com/security-alerts/cpujan2021.html

Restart Required: Yes

Instructions:

1. Download the appropriate Critical Patch Update from Oracle Support
2. Apply the patch following Oracle's E-Business Suite patching procedures
3. Restart affected services
4. Test functionality in a non-production environment first

🔧 Temporary Workarounds

Network Segmentation

linux

Restrict network access to Oracle E-Business Suite to trusted IP addresses only

iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP

Web Application Firewall Rules

all

Implement WAF rules to block suspicious HTTP requests to the Tasks component

🧯 If You Can't Patch

  • Implement strict network access controls to limit exposure to trusted users only
  • Enable detailed logging and monitoring for suspicious activity on the Tasks component

🔍 How to Verify

Check if Vulnerable:

Check Oracle E-Business Suite version and verify if Critical Patch Update for January 2021 has been applied

Check Version:

Check Oracle E-Business Suite version through application administration console or database queries specific to your implementation

Verify Fix Applied:

Verify patch application through Oracle's patch management tools and test the Tasks component functionality

📡 Detection & Monitoring

Log Indicators:

  • Unusual HTTP requests to Tasks component from unauthenticated sources
  • Multiple failed authentication attempts followed by successful access

Network Indicators:

  • HTTP traffic to Tasks endpoints from unexpected sources
  • Unusual data extraction patterns

SIEM Query:

source="oracle_ebs" AND (uri="*tasks*" OR component="Tasks") AND (src_ip NOT IN trusted_networks)

📊 Metadata

CVE ID: CVE-2021-2034
CVSS v3 Score: 8.2 (HIGH)
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Published: January 20, 2021
Last Updated: November 21, 2024

🔗 References

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