How to remediate – AIM Smiley Icon Location Remote Denial Of Service

1. Introduction

The AIM Smiley Icon Location Remote Denial Of Service vulnerability affects remote Windows applications. It allows an attacker to crash a vulnerable application by sending it specially crafted data related to AOL Instant Messenger (AIM) ‘smiley’ icons. This can lead to service disruption and potentially impact business operations. Confidentiality, integrity, and availability may be affected due to the potential for system downtime.

2. Technical Explanation

The vulnerability stems from improper handling of invalid data passed as the location of a ‘smiley’ icon within AOL Instant Messenger on Windows systems. This leads to an application crash, likely caused by a buffer overflow when processing the malformed input. An attacker can exploit this by sending a crafted AIM message containing an invalid file path for a smiley icon.

• Root cause: The remote host has installed a version of AOL Instant Messenger that does not properly validate data passed as the location of a ‘smiley’ icon.
• Exploit mechanism: An attacker sends a malicious AIM message with an invalid file path for a smiley icon, triggering a crash in the application.
• Scope: Windows systems running vulnerable versions of AOL Instant Messenger are affected.

3. Detection and Assessment

You can confirm vulnerability by checking the installed version of AOL Instant Messenger on your systems. A thorough method involves examining the Windows registry for related entries.

• Quick checks: Check the ‘Programs and Features’ control panel to see if AOL Instant Messenger is installed.
• Scanning: Nessus plugin ID 13553 can be used to detect this vulnerability, but results should be verified manually.
• Logs and evidence: Examine the Windows Event Logs for application crashes related to AIM or AOL Instant Messenger processes. Look for events with source “Application Error” or similar.

reg query "HKLMSOFTWAREAmerica Online" /v Version

4. Solution / Remediation Steps

Currently, there is no known solution at this time. Mitigation focuses on limiting exposure and monitoring for exploitation attempts.

4.1 Preparation

• There are no dependencies or pre-requisites. A roll back plan involves restoring the registry from backup.
• Change windows may be required depending on your organisation’s policies, approval should be sought from IT security team.

4.2 Implementation

1. Step 1: Monitor systems for exploitation attempts and unusual application crashes related to AIM or AOL Instant Messenger.
2. Step 2: Consider disabling or uninstalling AOL Instant Messenger if it is not essential.

4.3 Config or Code Example

This vulnerability does not involve a configuration change, but rather the presence of a vulnerable application.

Before

AOL Instant Messenger installed on system

After

AOL Instant Messenger uninstalled from system.

4.4 Security Practices Relevant to This Vulnerability

Several security practices can help reduce the risk of this type of vulnerability. Least privilege limits the impact if exploited, and a robust patch cadence ensures timely updates.

• Practice 1: Implement least privilege principles to limit the permissions granted to applications like AIM.
• Practice 2: Maintain a regular patch cadence for all software on your systems.

4.5 Automation (Optional)

Automation is not directly applicable as there is no known fix at this time, but can be used to monitor for the presence of vulnerable applications.

# PowerShell example to check for AOL Instant Messenger installation
Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -like "*AOL Instant Messenger*"}

5. Verification / Validation

• Post-fix check: Run `Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -like “*AOL Instant Messenger*”}` and verify no results are returned.
• Re-test: Check the ‘Programs and Features’ control panel to confirm AOL Instant Messenger is not listed.
• Monitoring: Monitor Windows Event Logs for application crashes related to AIM or AOL Instant Messenger processes, ensuring no new events are logged.

Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -like "*AOL Instant Messenger*"}

6. Preventive Measures and Monitoring

Update security baselines to exclude vulnerable applications like AIM. Implement application control policies to prevent the installation of unapproved software.

• Baselines: Update your security baseline or policy to explicitly disallow the installation of AOL Instant Messenger.
• Pipelines: Add checks in CI/CD pipelines to scan for and block the deployment of vulnerable applications.
• Asset and patch process: Implement a regular asset inventory and patch management process to identify and address vulnerabilities promptly.

7. Risks, Side Effects, and Roll Back

• Risk or side effect 1: Disruption of AIM-based communications. Mitigation: Provide alternative communication channels.
• Roll back: Reinstall AOL Instant Messenger from a trusted source.

8. References and Resources

Refer to the official CVE entry for detailed information about this vulnerability.

• Vendor advisory or bulletin: Not available at this time.
• NVD or CVE entry: CVE-2005-1655
• Product or platform documentation relevant to the fix: Not applicable as there is no known fix.