IBM Informix Dynamic Server versions 11.1 and 10.0 contain a vulnerability that could allow an authenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code.
The vulnerability exists due to an input validation error by the oninit.exe service. An authenticated, remote attacker could exploit this vulnerability to cause a buffer overflow by sending malicious data to the vulnerable system using TCP port 1526. The buffer overflow could cause the affected service to crash or allow the attacker to execute arbitrary code with the privileges of the service.
IBM has confirmed this vulnerability and released updated software.
Indicators of Compromise
IBM Informix Dynamic Server versions 11.1 and 10.0 are vulnerable.
To exploit this vulnerability, the attacker must first authenticate to the Informix Dynamic Server with sufficient privileges to connect to the database.
The oninit.exe service does not properly validate user-supplied input passed in the DBPATH variable. The attacker could exploit this vulnerability to cause a buffer overflow by sending an overly long value for DBPATH in a connection over TCP port 1526. The buffer overflow could cause the oninit.exe process to crash or allow the attacker to execute arbitrary code with the privileges of the affected service, possibly SYSTEM.
To exploit this vulnerability, the attacker must first authenticate to the Informix Dynamic Server. A successful attack could allow the attacker to execute arbitrary code with elevated privileges. The attacker may be able to take complete control of the vulnerable system.
Administrators are advised to apply the updates and mitigations provided by IBM.
Administrators are advised to restrict database access to trusted users.
Administrators are advised to prevent possible external attacks by implementing a strong firewall strategy.
Administrators are advised to monitor critical systems for signs of suspicious activity.
IBM has released APARs for registered users at the following links:
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