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On Windows 7 (or Vista) I use
Advisory 2007-02-01.01
Comodo Multiple insufficient argument validation of hooked SSDT function Vulnerability
Basic information:
Release date: February 01, 2007
Last update: February 07, 2007
Severity:Medium
Character:System crash
Status:Fixed
Testing program: BTP00000P005CF.zip
Description:
Hooking SSDT functions requires extra caution. SSDT function handlers are executed in the kernel mode but their callers are executed in the user mode. Hence all function arguments come from the user mode. This is why it is necessary to validate these arguments properly. Otherwise a simple user call can easily crash the whole system. This bug usually results in a system crash. However, it may happen that this bug is even more dangerous and may lead to the execution of an arbitrary code in the privileged kernel mode.
Comodo Firewall Pro (former Comodo Personal Firewall) hooks many functions in SSDT and in at least seven cases it fails to validate arguments that come from the user mode. User calls to NtConnectPort (CFP 2.4.16.174 is not affected), NtCreatePort (CFP 2.4.16.174 is not affected), NtCreateSection, NtOpenProcess, NtOpenSection, NtOpenThread and NtSetValueKey with invalid argument values can cause system crashes because of errors in CFP driver cmdmon.sys. Further impacts of this bug (like arbitrary code execution in the kernel mode) were not examined.
Vulnerable software:
- Comodo Firewall Pro 2.4.16.174
- Comodo Personal Firewall 2.3.6.81
- probably all older versions of Comodo Personal Firewall 2
- possibly older versions of Comodo Personal Firewall
Not vulnerable software:
- Comodo Firewall Pro 2.4.17.183 and higher
Events:
- 2007-02-06: The product vendor released Comodo Firewall Pro 2.4.17.183, which fixed the bug
- 2007-02-03: Candidate for inclusion in the CVE list
- 2007-02-01: Vulnerability confirmed by popular information sources
- 2007-02-01: Advisory released
- 2007-01-24: Vendor notification