Patch

CVE-2023-49606

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Vulnerability Overview

CVE Name

CVE-2023-49606

Severity

9.8

Critical

CVE Description

A use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy 1.10.0. A specially crafted HTTP header can trigger reuse of previously freed memory, which leads to memory corruption and could lead to remote code...

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Latest Patch info

There is no patch available at the moment, but you can use our script.

Patch Name

Date

Script

Script Type

Remediation script

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🔒 Remediating CVE-2023-49606 Vulnerability in Tinyproxy CVE-2023-49606, identified by Cisco Talos and rated at a critical 9.8 on the CVSS scale, is a pressing concern. The purpose of this script is to actively mitigate this vulnerability, applying security measures to safeguard systems against potential exploits. 🔍 How it Works: This Bash script enhances your defense by applying targeted iptables rules. These rules are specifically designed to block malicious HTTP Connection headers that could be exploited by attackers to trigger the vulnerability, providing an essential layer of protection. ⚠️ Why it Matters: With a significant number of Tinyproxy installations openly accessible and vulnerable, immediate action is crucial. By implementing this script, you can prevent attackers from exploiting CVE-2023-49606, averting potential memory corruption and remote code execution on your servers. 🛡️ Additional Mitigations: Besides deploying our iptables script, you can: Limit Network Access: Restrict access to Tinyproxy to trusted IP addresses only. Stay Updated: Follow updates from Tinyproxy’s development team and apply security patches as soon as they are available. Implement IDS: Use Intrusion Detection Systems to monitor and respond to suspicious activities effectively. Note: As stated in the script, don't forget to save these iptables rules permanently if required for your system. You can use 'iptables-save > /path/to/your/iptables.conf' and restore them with 'iptables-restore < /path/to/your/iptables.conf' after system reboots.

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#!/bin/bash

if ! command -v iptables &> /dev/null; then
    echo "iptables not installed. Please install iptables to use this script."
    exit 1
fi

# Allow specifying the proxy port as an argument, default to 8888 if not provided
PROXY_PORT=${1:-8888}

echo "Adding iptables rules on port $PROXY_PORT..."

# Block requests with multiple "Connection:" headers, indicative of an attempt to exploit
if iptables -I INPUT -p tcp --dport $PROXY_PORT -m string --string "Connection: Connection" --algo kmp -m string --string "Connection: " --algo kmp --from 40 -j DROP; then
    echo "Rule added: Block multiple 'Connection:' headers."
else
    echo "Failed to add rule for 'Connection:' headers."
fi

# Block requests with "Proxy-Connection:" if used in a suspicious manner
if iptables -I INPUT -p tcp --dport $PROXY_PORT -m string --string "Proxy-Connection: Proxy-Connection" --algo kmp -j DROP; then
    echo "Rule added: Block 'Proxy-Connection:' headers."
else
    echo "Failed to add rule for 'Proxy-Connection:' headers."
fi

echo "Don't forget to save these iptables rules permanently if required for your system."
echo "You can use 'iptables-save > /path/to/your/iptables.conf' and restore them with 'iptables-restore < /path/to/your/iptables.conf' after system reboots."

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Affected OS & Apps

No items found.

4.8

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