CVE-2022-1379 – CVE-2022-1379 is a URL restriction bypass vulne... (How to Fix)

Q: What is the severity of CVE-2022-1379?

CVE-2022-1379 has a CVSS score of 9.1 (CRITICAL). CVE-2022-1379 is a URL restriction bypass vulnerability in PlantUML that allows attackers to bypass security profile restrictions and perform server-side request forgery (SSRF). This enables access to internal resources or requests to third-party servers. Anyone using PlantUML versions prior to 1.2022.5 is affected.

📋 TL;DR

CVE-2022-1379 is a URL restriction bypass vulnerability in PlantUML that allows attackers to bypass security profile restrictions and perform server-side request forgery (SSRF). This enables access to internal resources or requests to third-party servers. Anyone using PlantUML versions prior to 1.2022.5 is affected.

💻 Affected Systems

Products:

PlantUML

Versions: All versions prior to 1.2022.5

Operating Systems: All

Default Config Vulnerable: ⚠️ Yes

Notes: Affects all deployments where PlantUML processes untrusted input, including web applications, documentation generators, and CI/CD pipelines using PlantUML.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete compromise of internal network resources, data exfiltration from internal systems, or use as a pivot point for further attacks.

🟠

Likely Case

Unauthorized access to internal HTTP services, metadata services, or internal APIs that should be protected.

🟢

If Mitigated

Limited impact with proper network segmentation, egress filtering, and security profiles configured.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires ability to provide input to PlantUML, which is common in documentation systems and web applications.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.2022.5

Vendor Advisory: https://github.com/plantuml/plantuml/commit/93e5964e5f35914f3f7b89de620c596795550083

Restart Required: Yes

Instructions:

1. Update PlantUML to version 1.2022.5 or later. 2. Restart any services using PlantUML. 3. Verify the fix by testing with known exploit payloads.

🔧 Temporary Workarounds

Restrict Input Sources

all

Limit PlantUML input to trusted sources only and implement input validation.

Network Segmentation

all

Implement network controls to restrict PlantUML server's outbound connections.

🧯 If You Can't Patch

Implement strict network egress filtering to limit PlantUML's outbound connections
Run PlantUML in isolated network segments with no access to sensitive internal resources

🔍 How to Verify

Check if Vulnerable:

Check PlantUML version using 'java -jar plantuml.jar -version' or check application dependencies.

Check Version:

java -jar plantuml.jar -version

Verify Fix Applied:

Test with known SSRF payloads that should be blocked in patched versions.

📡 Detection & Monitoring

Log Indicators:

Unusual outbound HTTP requests from PlantUML process
Requests to internal IP ranges or metadata services

Network Indicators:

Unexpected outbound HTTP traffic from PlantUML servers to internal networks

SIEM Query:

source="plantuml" AND (dest_ip=169.254.169.254 OR dest_ip IN [10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16])

📊 Metadata

CVE ID: CVE-2022-1379

CVSS v3 Score: 9.1 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE: CWE-918

Published: May 14, 2022

Last Updated: November 21, 2024

🔗 References

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