full-disclosure - Security hole in Confixx backup script

lists.openwall.net		lists / announce john-users owl-users popa3d-users / xvendor oss-security / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4
Open Source and information security mailing list archives

This website is powered by Openwall GNU/*/Linux security-enhanced OS

[<prev] [next>] [<thread-prev] [thread-next>] [month] [year] [list]

From: dirk at pirschel.de (Dirk Pirschel)
Subject: Security hole in Confixx backup script

Hi,

* Dirk Pirschel wrote on Mon, 02 Aug 2004 at 13:00 +0200:

> A user might use the restore funktion to change the ownership of
> target files to his own.

The restore script runs with root privileges.  It unpacks the archive,
and then executes "chown -R $user" in the destination directory
($HOME/html or $HOME/files).  Before running the restore script, an
attacker can make hardlinks to files not owned by himself.  The
ownership of these files will be changed.

On some badly administered systems there is only one disk partion, so it
is possible to make a hardlink to /etc/shdadow within $HOME.

-Dirk

-- 
Linux - Life is too short for reboots
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 232 bytes
Desc: not available
Url : http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20040809/7535203b/attachment.bin