A security issue has been reported in VMware ESXi, which can be exploited by malicious people to bypass certain security restrictions.
The security issue is caused due to the Update Installer incorrectly handling the SFCB authentication mode, which can lead to the SFCB authentication allowing arbitrary username and password combinations.
Successful exploitation requires that ESXi 4.1 was upgraded from ESXi 3.5 or 4.0, the SFCB configuration file (/etc/sfcb/sfcb.cfg) was modified prior to the upgrade, and that the sfcbd daemon is running (default).
The security issue is reported in version 4.1.
Solution: Install the "ESXi 4.1 Installable Update 1", which contains the patch ESXi410-201101201-SG.
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