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Message-ID: <45014972.7070703@effective-it.co.uk>
Date: Fri, 08 Sep 2006 11:44:02 +0100
From: Lee Ball <lee@...ective-it.co.uk>
To: Hadmut Danisch <hadmut@...isch.de>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: Re: Linux kernel source archive vulnerable
Hadmut Danisch wrote:
> On Fri, Sep 08, 2006 at 12:52:22AM +0530, Raj Mathur wrote:
>> I wouldn't know if something has changed drastically between 2.6.16
>> and 2.6.17.11, but:
>>
>> raju@...l:~$ find /usr/src/linux-2.6.16/ -perm -666 ! -type l
>> raju@...l:~$
>>
>> Not a single world-writable file or directory. Perhaps pre-release
>> kernel tarballs are more lax?
>
>
> On my machine (I also have a 2.6.16):
>
> # find /usr/src/linux-2.6.16/ -perm -666 ! -type l | wc -l
> 20434
>
> Just to doublecheck I wrote a script which parses the kernel tar:
>
> pax_global_header 52 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/ 0 b mode=777 uid= 0 gid= 0
> linux-2.6.17.11/.gitignore 462 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/COPYING 18693 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/CREDITS 89536 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/ 0 b mode=777 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/00-INDEX 10581 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/BUG-HUNTING 7249 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/Changes 11655 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/CodingStyle 17843 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/DMA-API.txt 21291 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/DMA-ISA-LPC.txt 5332 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/DMA-mapping.txt 32801 b mode=666 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/DocBook/ 0 b mode=777 uid= 0 gid= 0
> linux-2.6.17.11/Documentation/DocBook/.gitignore 35 b mode=666 uid= 0 gid= 0
> ...
>
>
> A friend of mine confirmed to also have world writable dirs and files.
>
> regards
> Hadmut
Sorry to add my 2 pence worth but I noticed that Raj ran his command as
a normal user and you Hadmut have ran yours as root. Isn't it going to
be ok as the directories above these world writeable files aren't
writeable/readable by a non-superuser?
Cheers
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