70114 : VMware ESXi Update Installer Arbitrary Credentials SFCB Authentication Mode Bypass
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
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Timeline

Disclosure Date
2010-12-21

Description

VMware ESXi contains a flaw related to the Update Installer, which fails to properly configure the SFCB authentication mode. This may allow a remote attacker to bypass SFCB authentication with an arbitrary username and password.

Classification

Location: Remote / Network Access
Attack Type: Authentication Management
Impact: Loss of Integrity
Solution: Workaround
Exploit: Exploit Public
Disclosure: Vendor Verified

Solution

Currently, there are no known upgrades or patches to correct this vulnerability. It is possible to temporarily work around the flaw by implementing the following workaround:

# Log in to your ESXi 4.1 host using Tech Support mode as described in Using Tech Support Mode in ESXi 4.1 (KB 1017910).
# Open /etc/sfcb/sfcb.cfg in a text editor.
# Find the following line:
basicAuthLib: sfcBasicAuthentication
# Change the line to the following:
basicAuthLib: sfcBasicPAMAuthentication
# Save the changes.
# Reboot the system or restart the sfcb service using the following command:
/etc/init.d/sfcbd-watchdog restart

Products

VMware, Inc.

VMware ESXi

4.1

References

Security Tracker: 1024917
CVE ID: 2010-4573 (see also: NVD)
Secunia Advisory ID: 42591
Bugtraq ID: 45543
VUPEN Advisory: ADV-2010-3303
Vendor Specific News/Changelog Entry: http://kb.vmware.com/kb/1031761
http://www.vmware.com/security/advisories/VMSA-2010-0020.html
Mail List Post: http://lists.vmware.com/pipermail/security-announce/2010/000114.html

Credit

Not Available

CVSSv2 Score

CVSSv2 Base Score = 9.3
Source: nvd.nist.gov | Generated: 2010-12-23 | Disagree?

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