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Check Point Zonelabs - ZoneAlarm SRESCAN Driver Local Privilege Escalation
------------------------------------------------------------------------
SUMMARY
A vulnerability in ZoneAlarm's SRESCAN driver allows local attackers to
gain privileges by exploiting a vulnerability that allows attackers to
write content to any address they wish to and which the device driver has
access to.
DETAILS
Vulnerable Systems:
* ZoneAlarm with Srescan.sys version 5.0.155 and prior
Srescan.sys is exposed through the following Dos Device: \\.\SreScan.
Restricted accounts, including guest users, can access privileged IOCTLs
implemented within the driver affected. In addition to this potential risk
factor, the driver does not validate user-mode buffers in Type3 , thus
leading to local privilege escalation due to arbitrary Kernel memory
overwrite.
Assembly dump:
------------------------- IOCTL 0x2220CF
text:00013127 mov ecx, [ebp+arg_10]
text:0001312A cmp dword ptr [ecx], 4 ;
text:0001312D jnz short loc_1313F
text:0001312F mov edx, [ebp+FileInformation]
text:00013132 mov dword ptr [edx], 30000h ; edx
controlled
text:00013138 xor esi, esi
text:0001313A mov [ebp+var_1C], esi
text:0001313D jmp short loc_1315F
------------------------- IOCTL 0x22208F
text:00014091 mov ebp, ds:ExAllocatePoolWithTag
text:00014097 mov esi, 20000h
text:0001409C push 31565244h ; Tag
text:000140A1 push esi ; NumberOfBytes
text:000140A2 push 0 ; PoolType
text:000140A4 call ebp ; ExAllocatePoolWithTag
text:000140A6 mov ebx, eax
text:000140A8 test ebx, ebx
text:000140AA jz short loc_140F3
text:000140AC mov edi, ds:ZwQuerySystemInformation
text:000140B2
text:000140B2 loc_140B2: ; CODE
XREF:sub_14070+81#j
text:000140B2 lea ecx, [esp+1Ch+ReturnLength]
text:000140B6 push ecx ; ReturnLength
text:000140B7 push esi ;
SystemInformationLength
text:000140B8 push ebx ; SystemInformation
text:000140B9 push 5 ;
SystemInformationClass
text:000140BB call edi ; ZwQuerySystemInformation
text:000140BD cmp eax, 0C0000023h
text:000140C2 mov [esp+1Ch+var_4], eax
text:000140C6 jz short loc_140D6
text:000140C8 cmp eax, 80000005h
text:000140CD jz short loc_140D6
text:000140CF cmp eax, 0C0000004h
text:000140D4 jnz short loc_14102
text:0001411D loc_1411D: ; CODE XREF:
sub_14070+112#j
text:0001411D mov eax, [edx+44h]
text:00014120 test eax, eax
text:00014122 jz short loc_1417A
[...]
text:00014154 mov dword ptr [eax+4], 0
text:0001415B mov esi, [edx+3Ch]
text:0001415E lea edi, [eax+0Ch] ; edi =
OutputBuffer. Controlled
text:00014161 mov eax, ecx
text:00014163 shr ecx, 2
text:00014166 rep movsd
text:00014168 mov ecx, eax
text:0001416A mov eax, [esp+1Ch+var_8]
text:0001416E and ecx, 3
text:00014171 inc eax
text:00014172 rep movsb
text:00014174 mov [esp+1Ch+var_8], eax
text:00014178 mov edi, ea
ADDITIONAL INFORMATION
The information has been provided by <mailto:advisories@reversemode.com>
Reversemode.
The original article can be found at:
<http://www.reversemode.com/index.php?option=com_remository&Itemid=2&func=fileinfo&id=48>
http://www.reversemode.com/index.php?option=com_remository&Itemid=2&func=fileinfo&id=48
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