| GEN:SID | 1:517 |
| Message | MISC xdmcp query |
| Summary | This event is generated when an attempt is made to query the XDMCP service.
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| Impact | Serious. Information disclosure. Unauthorized access to the system.
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| Detailed Information | An XDMCP query can provide a wealth of information about a host such as a login screen, a list of users on the host, and to bypass access control restrictions used by tcpwrapper and to bypass the restriction of login by user "root" on the box.
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| Affected Systems | Any UNIX based server running XDMCP.
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| Attack Scenarios | An attacker can use this to find out information about the machine and then either launch a specific attack or connect to the X windows server using XDMCP.
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| Ease of Attack | Simple.
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| Corrective Action | Disable XDMCP if not needed.
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| Additional References | Arachnids: http://www.whitehats.com/info/IDS476
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| Rule References | arachnids: 476
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