CVE-2018-1936 in DB2
Summary
by MITRE
IBM DB2 9.7, 10.1, 10.5, and 11.1 libdb2e.so.1 is vulnerable to a stack based buffer overflow, caused by improper bounds checking which could allow an attacker to execute arbitrary code. IBM X-Force ID: 153316.
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Analysis
by VulDB Data Team • 08/21/2023
The vulnerability identified as CVE-2018-1936 affects IBM DB2 database server versions 9.7, 10.1, 10.5, and 11.1 through the libdb2e.so.1 library component. This represents a critical stack-based buffer overflow flaw that stems from inadequate input validation and bounds checking mechanisms within the database engine's shared library implementation. The vulnerability exists in the way the library processes certain input parameters during database operations, creating an exploitable condition where attacker-controlled data can overwrite adjacent memory locations on the stack.
The technical nature of this vulnerability places it squarely within CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to write beyond allocated buffer boundaries. The flaw manifests when the libdb2e.so.1 library receives malformed input through database connection or query processing operations, enabling an attacker to manipulate the program execution flow by overwriting return addresses and stack canaries. This type of vulnerability is particularly dangerous in database environments where the application may run with elevated privileges, potentially allowing attackers to execute arbitrary code with the same permissions as the database service account.
From an operational perspective, this vulnerability presents significant risk to organizations utilizing affected IBM DB2 versions as it could enable remote code execution attacks without requiring authentication. The impact extends beyond simple data compromise, as successful exploitation could lead to full system compromise, data exfiltration, and persistence mechanisms within the database environment. The vulnerability affects database connectivity and query processing functions, making it particularly dangerous in production environments where database services are continuously accessed. The attack vector typically involves sending specially crafted database queries or connection parameters that trigger the buffer overflow condition during library function execution.
Organizations should prioritize immediate remediation through official IBM security patches and updates addressing this vulnerability. The recommended mitigation strategy includes applying the latest IBM DB2 fixes and maintaining strict network segmentation to limit exposure. Additional protective measures should encompass database firewalling, monitoring for anomalous query patterns, and implementing principle of least privilege for database accounts. Security teams should also consider deploying intrusion detection systems capable of identifying exploitation attempts targeting this specific vulnerability pattern. The ATT&CK framework categorizes this vulnerability under T1059 for command and scripting interpreter and potentially T1078 for valid accounts, as exploitation could lead to privilege escalation and lateral movement within the database infrastructure. Regular vulnerability assessments and security scanning should be conducted to ensure all database components remain patched against known vulnerabilities, particularly those affecting core database libraries that handle external input processing.