full-disclosure - LSADump2 Crashing Windows

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Message-ID: <432EE5B5.7000803@gmail.com>
Date: Mon Sep 19 17:22:23 2005
From: nicolas.ruff at gmail.com (Nicolas RUFF)
Subject: LSADump2 Crashing Windows

More on LSADUMP2 / XP SP2 incompatibility ...

The root of the problem lies inside LSASRV.DLL. You already know that
the LSASS process has been plagued by many memory leaks over the years :

http://support.microsoft.com/search/default.aspx?qu=lsass+leak

With XP SP2, Microsoft added many memory management checks, and the
LsarQuerySecret() function called by LSADUMP2 has changed. There is an
additional check on the pLsaData parameter ; if pLsaData != NULL or
pLsaData.Buffer != NULL, LocalFree() is called before reallocating the
buffer (see code below).

After the LsaFreeMemory() call in LSADUMP2, pLsaData memory is
de-allocated but pLsaData is not set to NULL, so calling
LsarQuerySecret() a second time will trigger a "double free"-like error.

Fix :
Add 	"lsaData = NULL;"
After	"LsaFreeMemory (lsaData);"

Regards,
- Nicolas RUFF
Security researcher @ EADS-CCR

XP SP1
------

.text:74544733  mov     [ebp+var_C], ebx
.text:74544736  mov     [ebp+var_10], ebx
.text:74544739  mov     [ebp+var_8], ebx
.text:7454473C  mov     [ebp+var_2], bl
.text:7454473F  mov     byte ptr [ebp+var_1], bl
.text:74544742  call    _LsapTraceEvent@8 ; LsapTraceEvent(x,x)
.text:74544747  cmp     [esi+47h], bl
.text:7454474A  jnz     loc_74556A1E
.text:74544750
.text:74544750 loc_74544750:
.text:74544750  mov     al, [esi+45h]
.text:74544753  cmp     al, bl
.text:74544755  jz      loc_745412C9
.text:7454475B
.text:7454475B loc_7454475B:
.text:7454475B  cmp     al, bl
.text:7454475D  push    edi
.text:7454475E  mov     edi, 3000001h
.text:74544763  jz      loc_745412B2
.text:74544769
.text:74544769 loc_74544769:
.text:74544769  push    edi             ; AuthnSvc
.text:7454476A  push    4               ; int
.text:7454476C  push    4               ; int
.text:7454476E  push    2               ; AuthnLevel
.text:74544770  push    [ebp+arg_0]     ; int
.text:74544773  call    _LsapDbReferenceObject@20


XP SP2
------

.text:756CC465  mov     [ebp+var_C], ebx
.text:756CC468  mov     [ebp+var_10], ebx
.text:756CC46B  mov     [ebp+var_8], ebx
.text:756CC46E  mov     [ebp+var_2], bl
.text:756CC471  mov     byte ptr [ebp+var_1], bl
.text:756CC474  call    _LsapTraceEvent@8 ; LsapTraceEvent(x,x)
.text:756CC479  cmp     [esi+47h], bl
.text:756CC47C  jnz     loc_756E8A6E
.text:756CC482
.text:756CC482 loc_756CC482:
.text:756CC482  cmp     [esi+45h], bl
.text:756CC485  jnz     short loc_756CC491
.text:756CC487  test    byte ptr [esi+58h], 1
.text:756CC48B  jnz     loc_756E8A81
.text:756CC491
.text:756CC491 loc_756CC491:
.text:756CC491  mov     eax, [ebp+arg_pLsaData]
.text:756CC494  cmp     eax, ebx
.text:756CC496  jz      short pLsaData_or_LsaData_length_is_NULL
.text:756CC498  mov     eax, [eax]
.text:756CC49A  cmp     eax, ebx
.text:756CC49C  jnz     pLsaData_or_LsaData_length_is_not_NULL
.text:756CC4A2
.text:756CC4A2 pLsaData_or_LsaData_length_is_NULL:
.text:756CC4A2  push    edi
.text:756CC4A3  mov     edi, [ebp+arg_pOldLsaData]
.text:756CC4A6  cmp     edi, ebx
.text:756CC4A8  jnz     pOldLsaData_is_not_NULL
.text:756CC4AE
.text:756CC4AE pOldLsaData_is_NULL:
.text:756CC4AE  cmp     [esi+45h], bl
.text:756CC4B1  jnz     short loc_756CC4C9
.text:756CC4B3  lea     eax, [ebp+var_8]
.text:756CC4B6  push    eax
.text:756CC4B7  push    [ebp+arg_hSecret]
.text:756CC4BA  call    _LsapCrServerGetSessionKey@8
.text:756CC4BF  mov     esi, eax
.text:756CC4C1  cmp     esi, ebx
.text:756CC4C3  jl      loc_756DFA34
.text:756CC4C9
.text:756CC4C9 loc_756CC4C9:
.text:756CC4C9  push    3000001h
.text:756CC4CE  push    4
.text:756CC4D0  push    4
.text:756CC4D2  push    2
.text:756CC4D4  push    [ebp+arg_hSecret]
.text:756CC4D7  call    _LsapDbReferenceObject@20