full-disclosure - Re: Symlink vulnerabilities

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Date: Fri, 28 Oct 2011 11:46:52 +1100
From: GloW - XD <doomxd@...il.com>
To: Valdis.Kletnieks@...edu
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Symlink vulnerabilities

Yes... even adding a cron entry is possible if done right ;)


On 28 October 2011 04:51,  <Valdis.Kletnieks@...edu> wrote:
> On Thu, 27 Oct 2011 10:31:12 PDT, Andrew Farmer said:
>> And systems like inotify make filesystem races trivial to win. I
>> wouldn't be surprised if you could win this particular race reliably by
>> watching for the files bzexe drops and acting immediately when they show
>> up.
>
> Good point.  That actually has multiple benefits - first off, you don't have a
> 'while (1)' loop in your code that's easily spotted on a 'ps' or 'top'.  So you
> can afford to set the inotify and wait (potentially days, if needed) with less
> chance of detection.  And then when the inotify pops and tells you your file is
> ready to be exploited, the circumstances of returning from the blocked syscall
> will tend to give your process a scheduling boost, improving your chances of
> winning the race because you'll schedule soon.
>
> It's amazing how many optimizations people are coming up for a vulnerability
> that some were saying is impossible to exploit. ;)
>
>
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