A question about CVE-2014-8242
yhu2
yadi.hu at windriver.com
Mon May 11 20:03:23 MDT 2015
Thanks great!!!.
Yadi
On 05/12/2015 05:19 AM, Wayne Davison wrote:
> On Mon, May 11, 2015 at 12:50 AM, yhu2 <yadi.hu at windriver.com
> <mailto:yadi.hu at windriver.com>> wrote:
>
> whether or not CVE-2014-8242 affects rsync? any commnet would be
> appreciated!!
>
>
> Yes. It would be extremely hard for someone to trigger that via
> indirect means (such as inserting DB data and managing to match a
> checksum record boundary in contents somehow). So, it has a very
> small potential to cause a particular file to fail to transfer with a
> bad file-checksum. I've made a simple change that should avoid the issue:
>
> https://git.samba.org/?p=rsync.git;a=commit;h=eac858085e3ac94ec0ab5061d11f52652c90a869
>
> With the seed value moved to the right spot, an attacker can't craft a
> false-match record that works for any transfer. And the truly
> paranoid can use the --checksum-seed=NUM option with their own
> random-for-each-transfer value, should they think that rsync's seed
> method is too simplistic.
>
> I also plan to add a new checksum method, but that shouldn't be needed
> for thwarting this issue.
>
> ..wayne..
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