Re: LSADump2 Crashing Systems

[oh face <0h.fac3 () gmail com>]

Your patch works (though not tested extensively). My friend also
pointed out that PWDump code has the same problems that you mentioned.
Perhaps, it's time for an update, BindView?


On 9/16/05, Nicolas RUFF <nicolas.ruff () gmail com> wrote:
> 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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