bugtraq - ncpfs buffer overflow

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Date: Mon, 29 Nov 2004 13:58:02 +0100
From: Karol Więsek <appelast@...mnbass.art.pl>
To: full-disclosure@...ts.netsys.com, bugtraq@...urityfocus.com
Subject: ncpfs buffer overflow

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There is buffer overflow in ncplogin and ncpmap in nwclient.c.

static void strcpy_cw(wchar_t *w, const char* s) {
~        while ((*w++ = *(const nuint8*)s++) != 0);
}

NWDSCCODE NWDSCreateContextHandleMnt(NWDSContextHandle* ctx, const
NWDSChar * treeName){
...
wchar_t wc_treeName[MAX_DN_CHARS+1];

~  if (!treeName)
~      return ERR_NULL_POINTER;

~  strcpy_cw (wc_treeName,treeName);

Currently i have not managed to successfully exploit this bug on x86.

How to reproduce :

ncplogin -T `perl -e '{print"a"x"330"}'`
ncpmap -T `perl -e '{print"a"x"330"}'` /

Tested on ncpfs-2.2.4-1 from fedora core 2

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