full-disclosure - unarj dir-transversal bug (../../../..)

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From: evilninja at gmx.net (evilninja)
Subject: unarj dir-transversal bug (../../../..)

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Chris Umphress wrote:
>   chris@...is:~/test$ unarj x test.arj
>   UNARJ (Demo version) 2.30 Copyright (c) 1991 Robert K Jung
>   
>   Processing archive: test.arj
>   Archive date      : 2012-11-10 27:44:04
>   Can't open ../../usr/local/bin/test.txt
>       0 file(s)
> 
>   Found     1 error(s)!

hm, strange. i have:

evil@...ep:~$ unarj x test.arj
ARJ32 v 3.10, Copyright (c) 1998-2004, ARJ Software Russia. [27 Jun 2004]

Processing archive: test.arj
Archive created: 2004-10-12 01:15:49, modified: 2004-10-12 01:15:49
usr/bin/namei, Create this directory? Yes
Extracting ../usr/bin/namei           to usr/bin/namei               OK
     1 file(s)

so it's not taking all the ../ into account and also an .arj created with
full path is created in $PWD. arj + unarj are both v3.10.

> Apart from it removing one "../" from the filename I gave it, it
> worked exactly as I expected.

...somehow i don't expect programs to mess with /usr. not as a user and
not as root.

/me wonders about which version of arj/unarj "doubles" is talking about....

- --
BOFH excuse #303:

fractal radiation jamming the backbone
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