CVE-2023-6849 – This critical Server-Side Request Forgery (SSRF... (How to Fix)

Q: What is the severity of CVE-2023-6849?

CVE-2023-6849 has a CVSS score of 7.3 (HIGH). This critical Server-Side Request Forgery (SSRF) vulnerability in kodbox allows attackers to manipulate the 'path' parameter in the cover function to make unauthorized requests from the server. Attackers can potentially access internal services, exfiltrate data, or perform other malicious actions. All kodbox installations up to version 1.48 are affected.

📋 TL;DR

This critical Server-Side Request Forgery (SSRF) vulnerability in kodbox allows attackers to manipulate the 'path' parameter in the cover function to make unauthorized requests from the server. Attackers can potentially access internal services, exfiltrate data, or perform other malicious actions. All kodbox installations up to version 1.48 are affected.

💻 Affected Systems

Products:

kalcaddle kodbox

Versions: Up to version 1.48

Operating Systems: All platforms running kodbox

Default Config Vulnerable: ⚠️ Yes

Notes: All installations using the vulnerable fileThumb plugin are affected regardless of configuration.

📦 What is this software?

Kodbox by Kodcloud

View all CVEs affecting Kodbox →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could access internal services, exfiltrate sensitive data, perform port scanning of internal networks, or chain with other vulnerabilities to achieve remote code execution.

🟠

Likely Case

Unauthorized access to internal HTTP services, data exfiltration from internal systems, or reconnaissance of internal network infrastructure.

🟢

If Mitigated

Limited impact if network segmentation restricts internal service access and proper input validation is implemented.

🌐 Internet-Facing: HIGH - Remote exploitation possible without authentication, making internet-facing instances immediate targets.

🏢 Internal Only: MEDIUM - Internal attackers could still exploit to pivot within the network, but requires initial access.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploit details are publicly disclosed, making weaponization likely. Attack requires minimal technical skill.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.48.04

Vendor Advisory: https://github.com/kalcaddle/kodbox/releases/tag/1.48.04

Restart Required: No

Instructions:

1. Backup current installation. 2. Download version 1.48.04 from official repository. 3. Replace affected files or perform complete upgrade. 4. Verify patch commit 63a4d5708d210f119c24afd941d01a943e25334c is applied.

🔧 Temporary Workarounds

Disable fileThumb Plugin

all

Temporarily disable the vulnerable plugin to prevent exploitation

mv plugins/fileThumb plugins/fileThumb.disabled
Restart web server if required

Network Segmentation

all

Restrict kodbox server's outbound network access to prevent SSRF exploitation

Configure firewall rules to block outbound HTTP/HTTPS from kodbox server except to required services

🧯 If You Can't Patch

Implement strict network segmentation to isolate kodbox from internal services
Deploy web application firewall with SSRF protection rules

🔍 How to Verify

Check if Vulnerable:

Check kodbox version: if version <= 1.48, system is vulnerable. Also check if plugins/fileThumb/app.php exists without patch commit 63a4d5708d210f119c24afd941d01a943e25334c.

Check Version:

Check kodbox version in admin panel or examine version files in installation directory

Verify Fix Applied:

Verify version is 1.48.04 or higher, and check that commit 63a4d5708d210f119c24afd941d01a943e25334c is present in the codebase.

📡 Detection & Monitoring

Log Indicators:

Unusual HTTP requests from server to internal IPs
Requests to fileThumb plugin with unusual path parameters
Multiple failed outbound connection attempts

Network Indicators:

Outbound HTTP requests from kodbox server to internal services
Unusual port scanning patterns originating from kodbox server

SIEM Query:

source="kodbox_logs" AND (uri CONTAINS "/plugins/fileThumb" OR user_agent CONTAINS "kodbox") AND (dst_ip IN internal_range)

📊 Metadata

CVE ID: CVE-2023-6849

CVSS v3 Score: 7.3 (HIGH)

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

CWE: CWE-918

Published: December 16, 2023

Last Updated: November 21, 2024

🔗 References

https://github.com/kalcaddle/kodbox/commit/63a4d5708d210f119c24afd941d01a943e25334c Patch
https://github.com/kalcaddle/kodbox/releases/tag/1.48.04 Release Notes
https://note.zhaoj.in/share/jSsPAWT1pKsq Permissions Required
https://vuldb.com/?ctiid.248210 Permissions Required,Third Party Advisory
https://vuldb.com/?id.248210 Third Party Advisory
https://github.com/kalcaddle/kodbox/commit/63a4d5708d210f119c24afd941d01a943e25334c Patch
https://github.com/kalcaddle/kodbox/releases/tag/1.48.04 Release Notes
https://note.zhaoj.in/share/jSsPAWT1pKsq Permissions Required
https://vuldb.com/?ctiid.248210 Permissions Required,Third Party Advisory
https://vuldb.com/?id.248210 Third Party Advisory

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