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ZoneAlarm Invalid Pointer Dereference Vulnerability
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SUMMARY
<http://www.zonelabs.com/> Zone Labs ZoneAlarm "provides personal
firewall protection". Local exploitation of an invalid pointer dereference
vulnerability in Zone Labs LLC's ZoneAlarm personal firewall allows
attackers to trigger a denial of service (DoS) condition.
DETAILS
Vulnerable Systems:
* ZoneAlarm version 5.1 and prior
Immune Systems:
* ZoneAlarm version 5.5 or newer
ZoneAlarm offers process specific protection by hooking the kernel API
routine NtConnectPort(). NtConnectPort() is used by programs to implement
advanced inter-process communication (IPC). The NtConnectPort() function
is declared as follows:
NtConnectPort(
OUT PHANDLE ClientPortHandle,
IN PUNICODE_STRING ServerPortName,
IN PSECURITY_QUALITY_OF_SERVICE SecurityQos,
IN OUT PLPC_SECTION_OWNER_MEMORY ClientSharedMemory OPTIONAL,
OUT PLPC_SECTION_MEMORY ServerSharedMemory OPTIONAL,
OUT PULONG MaximumMessageLength OPTIONAL,
IN OUT PVOID ConnectionInfo OPTIONAL,
IN OUT PULONG ConnectionInfoLength OPTIONAL);
The problem specifically exists within vsdatant.sys as ZoneAlarm fails to
verify the second argument. 'ServerPortName' is a valid address prior to
derefencing it as a pointer. The vulnerable section of code is displayed
here:
0001EE93 mov esi, [esp+108h+ServerPortName]
0001EE9A mov edi, eax
0001EE9C test esi, esi
0001EE9E jz short loc_1EEB6
0001EEA0 mov edx, [esi+4]
The argument 'ServerPortName' is stored in the register ESI. A check is
made to ensure that the value is not NULL. If that check is passed, the
value is dereferenced as a pointer. Any non-zero invalid memory address
can be passed as the second argument to NtConnectPort(), resulting in a
system crash.
Analysis:
Exploitation allows local and remote attackers who have exploited another
vulnerability to trigger a DoS in kernel space, resulting in a "blue
screen of death."
Vendor response:
A vendor advisory for this issue is available at:
<http://download.zonelabs.com/bin/free/securityAlert/19.html>
http://download.zonelabs.com/bin/free/securityAlert/19.html
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0114>
CAN-2005-0114
Disclosure Timeline:
01/06/2005 - Initial vendor notification
01/07/2005 - Initial vendor response
02/11/2005 - Coordinated public disclosure
ADDITIONAL INFORMATION
The information has been provided by
<mailto:idlabs-advisories@idefense.com> iDEFENSE.
The original article can be found at:
<http://www.idefense.com/application/poi/display?id=199&type=vulnerabilities>
http://www.idefense.com/application/poi/display?id=199&type=vulnerabilities
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