full-disclosure - Re: Linux kernel source archive vulnerable

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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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