Rule: -- Sid: 1536 -- Summary: This event is generated when an attempt is made to exploit an authentication vulnerability in a web server or an application running on that server. -- Impact: Information gathering and system integrity compromise. Possible unauthorized administrative access to the server or application. -- Detailed Information: This event is generated when an attempt is made to gain unauthorized access to a web server or an application running ona web server. Some applications do not perform stringent checks when validating the credentials of a client host connecting to the services offered on a host server. This can lead to unauthorized access and possibly escalated privileges to that of the administrator. Data stored on the machine can be compromised and trust relationships between the victim server and other hosts can be exploited by the attacker. -- Affected Systems: -- Attack Scenarios: An attacker can access the authentication mechanism and supply his/her own credentials to gain access. Alternatively the attacker can exploit weaknesses to gain access as the administrator. -- Ease of Attack: Simple. Exploits exist. -- False Positives: None known. -- False Negatives: None known. -- Corrective Action: Disallow administrative access from sources external to the protected network. Ensure the system is using an up to date version of the software and has had all vendor supplied patches applied. -- Contributors: Sourcefire Research Team Brian Caswell Nigel Houghton -- Additional References: --