ZRCSA-200503 - ktools Buffer Overflow Vulnerability
Zone-H Research Center Security Advisory 200503
http://www.zone-h.fr
Date of release: 27/11/2005
Software: ktools (http://konst.org.ua/ktools)
Affected versions: <= 0.3
Risk: Medium
Discovered by: Mehdi Oudad "deepfear" and Kevin Fernandez "Siegfried" from the
Zone-H Research Team
Background (from http://konst.org.ua/ktools)
----------
ktools is a library which I wrote for my own programming needs, though its main
purpose is to provide various text-mode user interface controls without a need
to write too much code.
Details
--------
There is a buffer overflow in kkstrtext.h :
#define VGETSTRING(c, fmt) \
{ \
va_list vgs__ap; char vgs__buf[1024]; \
va_start(vgs__ap, fmt); \
vsprintf(vgs__buf, fmt, vgs__ap); c = vgs__buf; \
va_end(vgs__ap); \
}
This library is used in the following softwares:
centericq
orpheus
motor
groan
(see http://konst.org.ua/en/konstware)
It can be exploited for example in centericq when editing a contact's details
with a detail field longer than 1024 chars (a <description> field of a rss feed
for example).
Details:
- centericq.cc :
case ACT_EDITUSER:
c->save();
/***************** here************/
if(face.updatedetails(c, c->getdesc().pname)) {
if(c->getdesc().pname == infocard)
c->setdispnick(c->getnick());
...
...
- icqdialogs.cc :
bool icqface::updatedetails(icqcontact *c, protocolname upname) {
...
...
while(!finished) {;
gendetails(db.gettree(), c);
...
...
gendetails()
..
if((capab.count(hookcapab::flexiblereg) && ri.params.empty()) ||
!capab.count(hookcapab::flexiblereg)) {
i = tree->addnode(_(" About "));
tree->addleaff(i, 0, 39, " %s ", about.c_str());
- treeview.cc :
int treeview::addleaff(int parent, int color, int ref, const char *fmt, ...) {
string buf;
VGETSTRING(buf, fmt);
return addleaf(parent, color, (void *) ref, buf);
}
- kkstrtext.h :
#define VGETSTRING(c, fmt) \
{ \
va_list vgs__ap; char vgs__buf[1024]; \
va_start(vgs__ap, fmt); \
vsprintf(vgs__buf, fmt, vgs__ap); c = vgs__buf; \
va_end(vgs__ap); \
}
Solution
---------
None. Vendor contacted on 18/11 and 25/11, no answer.
Original advisories:
English version: http://www.zone-h.org/en/advisories/read/id=8480/
French: http://www.zone-h.fr/fr/advisories/read/id=685
