CVE-2023-32230 – An unauthenticated attacker can send a malforme... (How to Fix)

📋 TL;DR

An unauthenticated attacker can send a malformed API request to Bosch BT software products, causing a Denial of Service (DoS) by crashing or disrupting the API server. This affects all systems running vulnerable versions of Bosch BT software with exposed API endpoints.

💻 Affected Systems

Products:

Bosch BT software products

Versions: Specific versions not detailed in advisory - refer to Bosch security advisory for exact affected versions

Operating Systems: Not specified - likely multiple platforms supported by Bosch BT software

Default Config Vulnerable: ⚠️ Yes

Notes: Affects systems with API server functionality enabled. Exact product names and versions should be verified against the Bosch advisory.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete service outage of the Bosch BT software, disrupting operations until manual restart or recovery procedures are performed.

🟠

Likely Case

Temporary service disruption affecting API functionality, potentially requiring system restart to restore normal operations.

🟢

If Mitigated

Minimal impact with proper network segmentation and API request validation in place.

🌐 Internet-Facing: HIGH - Unauthenticated remote exploitation makes internet-facing instances particularly vulnerable to DoS attacks.

🏢 Internal Only: MEDIUM - Internal attackers or compromised internal systems could still exploit this vulnerability to cause service disruption.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW - Simple malformed API request can trigger the vulnerability

The vulnerability requires sending a specifically crafted malformed request to the API endpoint.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Refer to Bosch security advisory for specific patched versions

Vendor Advisory: https://psirt.bosch.com/security-advisories/BOSCH-SA-092656-BT.html

Restart Required: Yes

Instructions:

1. Review Bosch security advisory BOSCH-SA-092656-BT
2. Identify affected product versions
3. Apply vendor-provided patches or updates
4. Restart affected services/systems
5. Verify functionality post-update

🔧 Temporary Workarounds

Network Segmentation

all

Restrict access to API endpoints to trusted networks only

Configure firewall rules to limit API access to authorized IP addresses/networks

API Request Validation

all

Implement input validation and sanitization for API requests

Configure web application firewall or API gateway to validate request structure

🧯 If You Can't Patch

Implement strict network access controls to limit API endpoint exposure
Deploy rate limiting and request validation at network perimeter

🔍 How to Verify

Check if Vulnerable:

Check system version against Bosch advisory and verify if API endpoints are accessible

Check Version:

Check product documentation for version verification commands specific to Bosch BT software

Verify Fix Applied:

Verify patch installation and test API functionality with normal requests

📡 Detection & Monitoring

Log Indicators:

Unusual malformed API requests
API server crash/restart events
High volume of failed API calls

Network Indicators:

Malformed HTTP/API requests to Bosch BT endpoints
Sudden drop in API response traffic

SIEM Query:

source="*bosch*" AND (event="crash" OR event="restart" OR status=500) AND uri="*/api/*"

📊 Metadata

CVE ID: CVE-2023-32230

CVSS v3 Score: 7.5 (HIGH)

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

CWE: CWE-703

Published: December 18, 2023

Last Updated: November 21, 2024

🔗 References

https://psirt.bosch.com/security-advisories/BOSCH-SA-092656-BT.html Vendor Advisory
https://psirt.bosch.com/security-advisories/BOSCH-SA-092656-BT.html Vendor Advisory

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