CVE-2012-1618 in PostgreSQL JDBC Driver
Summary
by MITRE
Interaction error in the PostgreSQL JDBC driver before 8.2, when used with a PostgreSQL server with the "standard_conforming_strings" option enabled, such as the default configuration of PostgreSQL 9.1, does not properly escape unspecified JDBC statement parameters, which allows remote attackers to perform SQL injection attacks. NOTE: as of 20120330, it was claimed that the upstream developer planned to dispute this issue, but an official dispute has not been posted as of 20121005.
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Analysis
by VulDB Data Team • 04/26/2018
The vulnerability described in CVE-2012-1618 represents a critical SQL injection flaw within the PostgreSQL JDBC driver that emerged due to improper handling of string escaping mechanisms. This issue specifically manifests when the JDBC driver interacts with PostgreSQL servers that have the "standard_conforming_strings" option enabled, which became the default configuration in PostgreSQL 9.1. The problem stems from the driver's failure to correctly escape JDBC statement parameters that are not explicitly specified, creating a pathway for malicious actors to inject arbitrary SQL code into database queries. The vulnerability affects versions of the PostgreSQL JDBC driver prior to 8.2, making it particularly concerning given the widespread adoption of these driver versions in enterprise applications.
The technical root cause of this vulnerability lies in the mismatch between how the JDBC driver handles string escaping and how PostgreSQL server processes strings when standard_conforming_strings is enabled. When this configuration is active, PostgreSQL treats backslash escape sequences in string literals differently than when the option is disabled, leading to inconsistent behavior in parameter handling. The JDBC driver's inability to properly account for this difference results in parameter values that contain special characters being interpreted by the database server as part of the SQL command rather than as literal string data. This creates a classic SQL injection vector where attackers can manipulate the execution flow of database operations through carefully crafted input parameters that bypass normal sanitization mechanisms.
The operational impact of this vulnerability extends beyond simple data theft, as it enables attackers to perform a wide range of malicious activities including unauthorized data access, modification, or deletion. Remote attackers can exploit this vulnerability without requiring authentication to the database, making it particularly dangerous in environments where database connections are exposed to untrusted networks. The attack surface is broad since many applications use JDBC drivers for database connectivity, and the vulnerability affects the interaction between client-side parameter binding and server-side string processing. Organizations running PostgreSQL 9.1 or later versions with the standard_conforming_strings option enabled are at risk, particularly those that do not properly validate or sanitize user inputs before passing them to database queries through JDBC interfaces.
Security professionals should recognize this vulnerability as a prime example of how seemingly minor configuration differences can create significant security gaps in database applications. The flaw aligns with CWE-89, which categorizes SQL injection vulnerabilities, and demonstrates how improper input handling can lead to remote code execution or data compromise. From an ATT&CK perspective, this vulnerability maps to techniques involving command and control communication, credential access, and privilege escalation through database manipulation. Organizations should prioritize updating their PostgreSQL JDBC drivers to version 8.2 or later, which contains the necessary fixes for proper string escaping. Additionally, implementing proper input validation, parameterized queries, and database access controls can provide defense-in-depth measures to mitigate potential exploitation attempts. The vulnerability also highlights the importance of thorough testing when upgrading database server configurations, particularly regarding option settings that can affect client driver behavior and security posture.