[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <9966eab6-4dba-5d17-3a59-5beb5200e745@thermi.consulting>
Date: Mon, 9 Dec 2019 18:30:22 +0100
From: Noel Kuntze <noel.kuntze+oss-security@...rmi.consulting>
To: oss-security@...ts.openwall.com
Subject: Re: Shell wildcards considered dangerous?
Hello Leonid,
I was referring to my own message, not the original one by Georgi.
Kind regards
Noel
Am 09.12.19 um 17:46 schrieb Leonid Isaev:
> On Mon, Dec 09, 2019 at 04:28:35PM +0100, Noel Kuntze wrote:
>> The message was about the attack vector on applications that put together
>> argument vectors based on user input, not specifically about human use of the
>> shell.
> Then, why in "tar xf *.tar" the "*" is expected to mean anything other than
> a literal * (0x2a)? It is because of the shell globbing: "tar xf ./*.tar" will
> work without any "--". For example:
> -----8<-----
> $ echo -E "xxx" > "-b xxx.qwetr"
> $ file *.qwetr
> file: invalid option -- ' '
> file: invalid option -- 'x'
> file: invalid option -- 'x'
> file: invalid option -- 'x'
> file: invalid option -- '.'
> file: invalid option -- 'q'
> file: invalid option -- 'w'
> Usage: file [-bcCdEhikLlNnprsvzZ0] [--apple] [--extension] [--mime-encoding]
> [--mime-type] [-e <testname>] [-F <separator>] [-f <namefile>]
> [-m <magicfiles>] [-P <parameter=value>] <file> ...
> file -C [-m <magicfiles>]
> file [--help]
> $
> $ file ./*.qwetr
> ./-b xxx.qwetr: ASCII text
> ----->8-----
>
> Sincerely,
> L.
--
Noel Kuntze
IT security consultant
GPG Key ID: 0x0739AD6C
Fingerprint: 3524 93BE B5F7 8E63 1372 AF2D F54E E40B 0739 AD6C
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
