Full Disclosure: Re: Linux kernel source archive vulnerable

From: Hadmut Danisch <hadmut_at_danisch.de>
Date: Thu, 7 Sep 2006 22:01:10 +0200

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_at_mail:~$ find /usr/src/linux-2.6.16/ -perm -666 ! -type l
> raju_at_mail:~$
>
> 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

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Received on Sep 07 2006