Bug 63702 (CVE-2004-1079)

Hello Olaf, 
this one was posted to Bugtraq. 
 
From: Karol WiÄsek <appelast@drumnbass.art.pl> 
User-Agent: Mozilla Thunderbird 0.9 (X11/20041103) 
To: full-disclosure@lists.netsys.com, bugtraq@securityfocus.com 
Subject: [Full-Disclosure] ncpfs buffer overflow 
Errors-To: full-disclosure-admin@lists.netsys.com 
Date: Mon, 29 Nov 2004 13:58:02 +0100 
 
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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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