Hello,
After investigating deeper, I found several problems in LSADUMP2 :
- Buffers too small (300 bytes for the smallest)
- Allocated memory not flagged as executable (that is why LSADUMP2 is
not compatible with the NX flag)
- Reuse of freed memory
Here is a small patch that has been tested sucessfully on Windows XP SP2
with DEP "AlwaysOn" enabled (where LSADUMP2 failed).
Regards,
- Nicolas RUFF
Security researcher @ EADS-CCR
---------------------------------------------------------------
diff lsadump2/dumplsa.c lsadump3/dumplsa.c
34a35
#define BUF_SIZE 1024
110c111
< char szBuffer[1000];
---
char szBuffer[BUF_SIZE];
137c138
< TCHAR szBuffer[300];
---
TCHAR szBuffer[BUF_SIZE];
189c190
< WCHAR wszSecret[500];
---
WCHAR wszSecret[BUF_SIZE];
230c231
< char szSecret[500];
---
char szSecret[BUF_SIZE];
242a244
lsaData = NULL;
diff lsadump2/lsadump2.c lsadump3/lsadump2.c
261c261
< MEM_COMMIT, PAGE_READWRITE);
---
MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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