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AUSCERT External Security Bulletin Redistribution
ESB-2015.2307
FSC-2015-3: Local Privilege Escalation
3 September 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: F-Secure Client Security
F-Secure Client Security Premium
F-Secure Anti-Virus for Workstations
F-Secure Server Security
F-Secure Server Security Premium
F-Secure Email and Server Security
F-Secure Email and Server Security Premium
F-Secure Protection Service for Business (PSB) Workstation Security
F-Secure Protection Service for Business (PSB) Server Security
F-Secure Protection Service for Business (PSB) Email and Server Security
F-Secure Safe Anywhere PC F-Secure Internet Security F-Secure Anti-Virus
Publisher: F-Secure
Operating System: Windows
Impact/Access: Administrator Compromise -- Existing Account
Resolution: Patch/Upgrade
Original Bulletin:
https://www.f-secure.com/en/web/labs_global/fsc-2015-3
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security advisories
FSC-2015-3: Local Privilege Escalation
Description
An Access Control List (ACL) bypass in the F-Secure Gatekeeper driver allows
local privilege escalation through kernel memory corruption.
Affected Products
Risk Level: HIGH (Low/Medium/High/Critical)
Component
F-Secure Gatekeeper driver - FSGK.SYS
Corporate products
F-Secure Client Security
F-Secure Client Security Premium
F-Secure Anti-Virus for Workstations
F-Secure Server Security
F-Secure Server Security Premium
F-Secure Email and Server Security
F-Secure Email and Server Security Premium
F-Secure Protection Service for Business (PSB) Workstation Security
F-Secure Protection Service for Business (PSB) Server Security
F-Secure Protection Service for Business (PSB) Email and Server Security
Consumer products
F-Secure Safe Anywhere PC F-Secure Internet Security F-Secure Anti-Virus
Platforms
Risk Level: HIGH (Low/Medium/High/Critical)
Windows
More Information
It was discovered that it is possible to bypass the Access Control List (ACL)
for the F-Secure Gatekeeper device driver, even when access rights is given
only to an Administrator or SYSTEM account. This is caused by the missing flag
of FILE_DEVICE_SECURE_OPEN when creating an object. A successful bypass of the
ACL will allow an attacker to manipulate the kernel buffer allocation,
resulting in a memory corruption. Successful exploitation will result in a
local privilege escalation of a normal user account to an administrator or
system account.
Fix Available
Component Versions Remarks
fsgk.sys 10.80.110.65 Fix is available in the automatic update channel
for all affected products. No user action is
needed if automatic updates is enabled.
Credits
F-Secure Corporation would like to thank Ilja van Sprundel from IOActive and
Thierry Decroix for bringing this issue to our attention.
Date Issued: 2015-09-01
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The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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