|
|
BugTraq
When scrubbing secrets in memory doesn't work Nov 05 2002 10:13PM Michael Howard (mikehow microsoft com) (3 replies) Re: When scrubbing secrets in memory doesn't work Nov 06 2002 12:55PM Gianni Tedesco (gianni ecsc co uk) (1 replies) Re: When scrubbing secrets in memory doesn't work Nov 05 2002 11:58PM Perry E. Metzger (perry piermont com) (1 replies) Re: When scrubbing secrets in memory doesn't work Nov 07 2002 08:08AM Andy Polyakov (appro fy chalmers se) |
|
Privacy Statement |
Hash: SHA1
At Dienstag, 5. November 2002 23:13 Michael Howard wrote:
> During the Windows Security Push in Feb/Mar 2002, we noticed an
> 'interesting' anomaly with code to scrub passwords that looks like this:
>
> bool DoSensitiveStuff() {
> bool fOK = false;
> const size_t cbPwd = 64;
> char szPwd[cbPwd];
> if (GetUserPassword(szPwd,cbPwd-1))
> if (DoSomethingWithPassword(szPwd))
> fOK = true;
>
> memset(szPwd,0,cbPwd);
>
> return fOK;
> }
Not to declare the intermediate storage for sensitive
data as 'volatile' is a coding flaw. An esily overlooked
one, yes, but nevertheless... Like forgetting to protect
critical code with semaphores.
- --
Michael Zimmermann (http://vegaa.de)
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org
iD8DBQE9y+UG72vu22ltWBERAqduAJ0YGSuDIWmU1boNIq/BFObDfSxi8gCfV3Si
R07sgLDQFqsZ8Rz2xVclOA0=
=2qe3
-----END PGP SIGNATURE-----
[ reply ]