[UNIX] ncpfs Buffer Overflow
From: SecuriTeam (support_at_securiteam.com)
Date: 09/08/05
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To: list@securiteam.com Date: 8 Sep 2005 13:51:34 +0200
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ncpfs Buffer Overflow
------------------------------------------------------------------------
SUMMARY
The <http://www.gsp.com/cgi-bin/man.cgi?section=1&topic=ncplogin>
ncplogin command is used to create a permanent connection to a NetWare
server. Permanent connections will stay connected even if no applications
use them.
By passing a long tree parameter to ncplogin and ncpmap, it is possible to
crash the program and possibly gain higher privileges.
DETAILS
Vulnerable Systems:
* ncpfs version 2.2.4-1 from fedora core 2
Both ncplogin and ncpmap are installed setuid by default, thus
exploitation allows privilege escalation.
Vulnerable Code:
From 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);
Proof of Concept:
The following two command lines will cause the triggering of the
vulnerability:
ncplogin -T `perl -e '{print"a"x"330"}'`
ncpmap -T `perl -e '{print"a"x"330"}'` /
ADDITIONAL INFORMATION
The information has been provided by <mailto:appelast@drumnbass.art.pl>
Karol Wi sek.
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