Re: [Bacula-users] Strange issue with backup size

Subject:

From:

Radosław Korzeniewski <radoslaw AT korzeniewski DOT net>

To:

Alberto Caporro <a.caporro AT consulthink DOT it>

Date:

Mon, 8 Apr 2013 13:25:56 +0200

Hello,

2013/4/8 Alberto Caporro <a.caporro AT consulthink DOT it>

I was on the point of making the same exact remark.

There's for sure a minor information leak (knowing the actual size of a sparse file),

It is not about a file size. All file metadata are unencrypted and simply available on the Bacula volume, so you can get it directly from volume or catalog.

but I fail to understand how an attacker could possibly take advantage of that, in the (IMHO) highly unlikely event that she is able to steal your backup tapes and make sense of what they contain.

It is about "Known plaintext attack".

I could be wrong about it and Bacula encryption could not be susceptible to this kind of attacks.

best regards

--
Radosław Korzeniewski
radoslaw AT korzeniewski DOT net

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