GEN:SID | 1:1882 |
Message | ATTACK-RESPONSES id check returned userid |
Summary | This event is generated by the use of a UNIX "id" command. This may be indicative of post-compromise behavior where the attacker is checking for super user privileges gained by a sucessful exploit against a vulnerable system.
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Impact | Serious. An attacker may have gained user access to the system.
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Detailed Information | This event is generated when a UNIX "id" command is used to confirm the user name of the currenly logged in user over an unencrypted connection. This connection can either be a legitimate telnet connection or the result of spawning a remote shell as a consequence of a successful network exploit.
The string "uid=" is an output of an "id" command indicating that a check is being made on the users current id.
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Affected Systems | |
Attack Scenarios | A buffer overflow exploit against an FTP server results in "/bin/sh" being executed. An automated script performing an attack, checks for the success of the exploit via an "id" command.
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Ease of Attack | Simple. This may be post-attack behavior and can be indicative of the successful exploitation of a vulnerable system.
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Corrective Action | Ensure that this event was not generated by a legitimate session then investigate the server for signs of compromise
Look for other events generated by the same IP addresses.
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Additional References | |