linux-kernel - Re: Chroot bug

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <46F92CBE.4090805@prepere.com>
Date:	Tue, 25 Sep 2007 17:43:58 +0200
From:	Miloslav Semler <majkls@...pere.com>
To:	Adrian Bunk <bunk@...nel.org>
CC:	serge@...lyn.com, davidsen@....com, philipp@...ek.priv.at,
	7eggert@....de, alan@...rguk.ukuu.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: Chroot bug

Adrian Bunk napsal(a):
> On Wed, Sep 26, 2007 at 12:40:27AM +0930, David Newall wrote:
>
>   
>> Miloslav Semler pointed out that a root process can chdir("..") out of its 
>> chroot.  Although this is documented in the man page, it conflicts with the 
>> essential function, which is to change the root directory of the process.  
>> In addition to any creative uses, for example Philipp Marek's loading 
>> dynamic libraries, it seems clear that the prime purpose of chroot is to 
>> aid security.  Being able to cd your way out is handy for the bad guys, but 
>> the good guys don't need it; there are a thousand better, safer solutions.
>> ...
>>     
>
> The bad guys most likely also now other tricks to escape the chroot.
>
> If you are root in the chroot you can e.g. mount the partition with the 
> root filesystem inside the chroot.
>
> If a bad guy becomes root inside a chroot it's game over.
>   
but why there keep 1000001th. It is same as:
There is milion ways howto dos your system.. Then we needn't repair bugs...
> cu
> Adrian
>
>   

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/