---
id: b3427605-d50a-463e-8ca9-5a0f7abaac27
---

# Inadequate SSL/TLS Configuration for Apache HTTP Server.
---

This incident type refers to a security vulnerability in the SSL/TLS configuration of the Apache HTTP Server, which can leave the server and its users vulnerable to attacks. The SSL/TLS configuration is responsible for encrypting the communication between the server and its clients, and if it is not configured properly, it can be exploited by hackers to intercept or modify sensitive data. This type of incident requires immediate attention from software engineers to ensure that the SSL/TLS configuration is properly configured to prevent any potential security threats.

### Parameters
```shell
export PATH_TO_CONFIG_FILE="PLACEHOLDER"

export PATH_TO_CERTIFICATE="PLACEHOLDER"

export SERVER_ADDRESS="PLACEHOLDER"

export PORT="PLACEHOLDER"

export CIPHER_LIST="PLACEHOLDER"

export PATH_TO_ERROR_LOG="PLACEHOLDER"
```

## Debug

### Check the Apache version
```shell
httpd -v
```

### Check the SSL/TLS configuration file
```shell
cat ${PATH_TO_CONFIG_FILE}
```

### Check the SSL/TLS certificate
```shell
openssl x509 -in ${PATH_TO_CERTIFICATE} -text -noout
```

### Check the SSL/TLS protocol versions enabled
```shell
openssl s_client -connect ${SERVER_ADDRESS}:${PORT} -tls1_2
```

### Check the SSL/TLS cipher suites enabled
```shell
openssl ciphers -v '${CIPHER_LIST}'
```

### Check the Apache error logs for SSL/TLS related errors
```shell
tail -f ${PATH_TO_ERROR_LOG}
```

## Repair

### The first step to remediate this incident type is to identify the specific SSL/TLS configuration vulnerabilities that exist in the Apache HTTP Server. This can be done by conducting a security audit of the server configuration and identifying any weaknesses or misconfigurations.
```shell


#!/bin/bash



# Conduct a security audit of the Apache HTTP Server configuration

audit_output=$(sudo apache2ctl configtest)



# Check if there are any SSL/TLS configuration vulnerabilities

if [[ "$audit_output" == *"Syntax OK"* ]]; then

    echo "No SSL/TLS configuration vulnerabilities found."

    exit 0

else

    echo "SSL/TLS configuration vulnerabilities found."

fi



# Fix the SSL/TLS configuration vulnerabilities

sudo sed -i 's/SSLCipherSuite.*/SSLCipherSuite ECDHE-RSA-AES256-SHA384:AES256-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH:!AESGCM/g' /etc/apache2/sites-available/default-ssl.conf

sudo sed -i 's/SSLProtocol.*/SSLProtocol all -SSLv2 -SSLv3/g' /etc/apache2/sites-available/default-ssl.conf

sudo a2enmod ssl

sudo service apache2 restart



echo "SSL/TLS configuration vulnerabilities remediated."

exit 0


```

This incident type refers to a security vulnerability in the SSL/TLS configuration of the Apache HTTP Server, which can leave the server and its users vulnerable to attacks. The SSL/TLS configuration is responsible for encrypting the communication between the server and its clients, and if it is not configured properly, it can be exploited by hackers to intercept or modify sensitive data. This type of incident requires immediate attention from software engineers to ensure that the SSL/TLS configuration is properly configured to prevent any potential security threats.


This incident type usually occurs when there is a failure in the SSL Handshake process between a client and server running on a Tomcat web server. This can happen for various reasons such as incorrect SSL certificate configuration, cipher suite mismatches, or network connectivity issues. When this type of incident is not resolved quickly, it can lead to downtime or service disruptions for users trying to access the affected service.


Tomcat SSL Handshake Failure Incident

This incident type refers to frequent mismatches between the virtual hosts configured on an Apache server. This can cause issues with routing traffic to the intended web application or website, resulting in downtime or other problems. It is important to address these mismatches promptly to ensure the proper functioning of the server and any associated applications.


Virtual Host Mismatches on Apache Server.

This incident type refers to an unauthorized access to directories in Apache HTTPD, which is a widely used web server software. It means that someone was able to access files or directories that they were not supposed to, without having proper authorization. This type of incident can potentially lead to sensitive data being exposed or even stolen, and can compromise the security of the server and the applications running on it.


Unauthorized Directory Access in Apache HTTPD.

The Slowloris Attack is a type of Denial of Service (DoS) attack that exploits a vulnerability in the Apache web server. It works by sending HTTP requests to the server and keeping those connections open for as long as possible, thereby using up all the available resources of the server and rendering it unresponsive to legitimate requests. As a result, the server becomes slow or unresponsive, causing downtime for the affected website or service. This type of attack can be detected and mitigated by implementing specific security measures and tools.


Slowloris Attack Detected on Apache server.

This incident type refers to the detection of SQL injection attempts in Apache web server logs. SQL injection is a type of cyber attack that exploits vulnerabilities in web applications allowing attackers to execute malicious SQL statements. In this incident, attackers are attempting to inject SQL code into the URI (Uniform Resource Identifier) of an Apache web server, potentially compromising the server's security and exposing sensitive information.


Apache SQL Injection Attempts in URI Incident

```shell
export PATH_TO_CONFIG_FILE="PLACEHOLDER"

export PATH_TO_CERTIFICATE="PLACEHOLDER"

export SERVER_ADDRESS="PLACEHOLDER"

export PORT="PLACEHOLDER"

export CIPHER_LIST="PLACEHOLDER"

export PATH_TO_ERROR_LOG="PLACEHOLDER"
```


### Check the Apache version

```shell
httpd -v
```

### Check the SSL/TLS configuration file

```shell
cat ${PATH_TO_CONFIG_FILE}
```

### Check the SSL/TLS certificate

```shell
openssl x509 -in ${PATH_TO_CERTIFICATE} -text -noout
```

### Check the SSL/TLS protocol versions enabled

```shell
openssl s_client -connect ${SERVER_ADDRESS}:${PORT} -tls1_2
```

### Check the SSL/TLS cipher suites enabled

```shell
openssl ciphers -v '${CIPHER_LIST}'
```

### Check the Apache error logs for SSL/TLS related errors

```shell
tail -f ${PATH_TO_ERROR_LOG}
```


### The first step to remediate this incident type is to identify the specific SSL/TLS configuration vulnerabilities that exist in the Apache HTTP Server. This can be done by conducting a security audit of the server configuration and identifying any weaknesses or misconfigurations.

```shell


#!/bin/bash



# Conduct a security audit of the Apache HTTP Server configuration

audit_output=$(sudo apache2ctl configtest)



# Check if there are any SSL/TLS configuration vulnerabilities

if [[ "$audit_output" == *"Syntax OK"* ]]; then

    echo "No SSL/TLS configuration vulnerabilities found."

    exit 0

else

    echo "SSL/TLS configuration vulnerabilities found."

fi



# Fix the SSL/TLS configuration vulnerabilities

sudo sed -i 's/SSLCipherSuite.*/SSLCipherSuite ECDHE-RSA-AES256-SHA384:AES256-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH:!AESGCM/g' /etc/apache2/sites-available/default-ssl.conf

sudo sed -i 's/SSLProtocol.*/SSLProtocol all -SSLv2 -SSLv3/g' /etc/apache2/sites-available/default-ssl.conf

sudo a2enmod ssl

sudo service apache2 restart



echo "SSL/TLS configuration vulnerabilities remediated."

exit 0


```


Inadequate SSL/TLS Configuration for Apache HTTP Server.

Overview

Parameters

Debug

Check the Apache version

Check the SSL/TLS configuration file

Check the SSL/TLS certificate

Check the SSL/TLS protocol versions enabled

Check the SSL/TLS cipher suites enabled

Repair

The first step to remediate this incident type is to identify the specific SSL/TLS configuration vulnerabilities that exist in the Apache HTTP Server. This can be done by conducting a security audit of the server configuration and identifying any weaknesses or misconfigurations.

Learn more

Related Runbooks

Tomcat SSL Handshake Failure Incident

Virtual Host Mismatches on Apache Server.

Unauthorized Directory Access in Apache HTTPD.

Slowloris Attack Detected on Apache server.

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