Full Report
The slides | tool | paper from BlackHat07/DefCon07 have been posted online for your wget’ing pleasure. More details on squeeza (the tool) can be found on the squeeza page, but in a nutshell is a sql injection tool that uses Metasploits concept of splitting exploit/payloads/etc with SQL Injection attacks. Current modules are written for MS-SQL server but include functionality for (user defined sql queries, some db schema enumeration, command execution, file-transfer, db_info) and the information is returned (channel selection) via one of (application error messages, DNS, Timing). The modularity’ness means that these all mix and match – I.e. if you write a module to “extract data from all tables that look like username*”, the results would be available on any of the available channels.. (Its a pretty neat tool.. and saved our bacon more than once) So check it out, and send feedback to [email protected]
Analysis Summary
# Tool/Technique: squeeza
## Overview
squeeza is a specialized SQL injection tool heavily inspired by the Metasploit Framework's concept of separating exploits and payloads. It is designed to execute data extraction, command execution, and file transfer tasks against targeted databases via SQL Injection vulnerabilities. A key feature is its method of exfiltrating gathered information using covert channels, including DNS lookups and timing side-channels.
## Technical Details
- Type: Tool
- Platform: Primarily targets MS-SQL Server environments (based on current modules).
- Capabilities: SQL Injection exploitation, database schema enumeration, command execution, file transfer, data retrieval, and covert data exfiltration (via errors, DNS, and timing).
- First Seen: BlackHat/DefCon 2007 (implied release timeframe: August 2007).
## MITRE ATT&CK Mapping
Since squeeza is an exploitation and data exfiltration tool leveraged against a database, relevant tactics focus on initial access (though not the injection itself) and data discovery/exfiltration.
- **TA0001 - Initial Access** (If used for initial remote code execution or database compromise)
- T1190 - Exploit Public-Facing Application (via SQL Injection)
- **TA0009 - Collection**
- T1083 - File and Directory Discovery (via DB schema enumeration)
- **TA0010 - Exfiltration**
- T1041 - Exfiltration Over C2 Channel (via covert channels like DNS/Timing)
## Functionality
### Core Capabilities
- **SQL Injection Exploitation:** Leverages SQL Injection to interact with the backend database.
- **Database Interaction:** Supports execution of user-defined SQL queries.
- **Information Gathering:** Includes modules for database schema enumeration and retrieving general database information (`db_info`).
- **Command Execution:** Capability to execute OS commands on the underlying server via SQL injection mechanisms.
- **File Transfer:** Functionality to move files to or from the compromised server.
### Advanced Features
- **Modularity:** The tool utilizes a modular structure allowing different capabilities (e.g., data extraction modules) to mix and match with any available data channel.
- **Covert Data Exfiltration Channels:** Information retrieved is returned via sophisticated channels:
1. Application Error Messages.
2. DNS resolution requests (implying data encoded in subdomains).
3. Timing side-channels (exploiting differences in server response times).
- **Cross Site Request Timing (CSRT):** The associated research paper discusses timing attacks that can leverage page load times, allowing a popular site to potentially conduct distributed brute-force attacks against session-state tracking mechanisms on web applications.
## Indicators of Compromise
Since squeeza is a framework tool and not traditional malware, IoCs are highly dependent on the specific module executed.
- File Hashes: Not provided in the context.
- File Names: Not provided in the context (tool acquisition via `wget`).
- Registry Keys: Not applicable for the data analysis focuses on SQL injection payloads.
- Network Indicators:
- DNS requests containing proprietary encoded data destined for external domains (depending on the exfiltration module used).
- Network traffic exhibiting anomalous response times correlated with query execution (Timing attacks).
- Behavioral Indicators:
- Anomalous database activity, especially frequent queries aimed at schema introspection.
- Outbound DNS queries originating from or related to the web application server, containing unusual subdomain structures.
## Associated Threat Actors
The context indicates this tool was developed and presented by the research team at SensePost (Haroon Meer). It is not associated with known malicious threat actor groups in this context, but rather presented as a security research proof-of-concept tool.
## Detection Methods
Detection focuses heavily on monitoring database interactions and unusual network patterns.
- Signature-based detection: Signatures tailored to the specific SQL payloads used by squeeza modules (e.g., specific command execution strings for MS-SQL).
- Behavioral detection: Monitoring for patterns indicative of SQLi, such as high volumes of complex queries, unexpected returns via error messages, or frequent, repetitive DNS lookups by the web application process during non-standard times.
- YARA rules: Not provided in the context.
## Mitigation Strategies
Mitigation centers on preventing the underlying vulnerability and monitoring covert channels.
- Prevention measures: Implement robust input validation and parameterized queries (prepared statements) to neutralize SQL Injection vulnerabilities.
- Hardening recommendations: Implement an egress filtering policy on database servers or surrounding networks to strictly control outbound DNS requests. Configure MSSQL security settings restrictively.
## Related Tools/Techniques
- **Metasploit Framework:** Directly referenced as the inspiration for the modular exploit/payload splitting concept.
- **SQLmap:** A widely known, automated SQL injection tool.
- **Timing Attacks:** The technique used for covert data exfiltration, analogous to various side-channel data leakage methods.
- **DNS Tunneling:** Related to the DNS-based exfiltration channel.