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TITLE:
VMware ESXi Update Installer SFCB Authentication Security Bypass

SECUNIA ADVISORY ID:
SA42591

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/42591/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=42591

RELEASE DATE:
2010-12-23

DISCUSS ADVISORY:
http://secunia.com/advisories/42591/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/42591/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=42591

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
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:
Follow the vendor's workaround.

Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
VMSA-2010-0020:
http://www.vmware.com/security/advisories/VMSA-2010-0020.html

VMware Knowledge Base Article #1031761:
http://kb.vmware.com/kb/1031761

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
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private users keeping their systems up to date against the latest
vulnerabilities.

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