Secure testing team - Jul 2009 - Bug#537977: directory traversal bug

Package: znc
Severity: grave
Tags: security patch

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Hi,

znc 0.072 fixes an high-impact directory traversal bug

| You can upload files to znc via /dcc send *status. The files will be saved in
<datadir>/users/<user>/downloads/.
| The code for this didn''t do any checking on the file name at all and
thus allowed directory traversal attacks by
| all znc users (no admin privileges required!).
| By exploiting this bug, attackers could e.g. upload a new ssh authorized_keys
file or upload a znc module which
| lets everyone gain shell access. Anything is possible.
| Again: ONLY A NORMAL USER ACCOUNT NEEDED, no admin privileges. THE ATTACKER
GOT WRITE ACCESS TO ALL PLACES ZNC GOT WRITE ACCESS TO.

Patch:
http://znc.svn.sourceforge.net/viewvc/znc?view=rev&sortby=rev&sortdir=down&revision=1570

Cheers,
Giuseppe.

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