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Format String in Netrek
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SUMMARY
<http://www.netrek.org/> Netrek is a well known real-time strategy game
inspired to Star Trek.
A format string vulnerability was discovered in the Netrek game server.
DETAILS
Vulnerable Systems:
* Netrek versions 2.12.0 and prior. (Vanilla server)
Immune Systems:
* Netrek version 2.12.1
The Vanilla server is affected by a format string vulnerability caused by
the calling of the pmessage2() function without the needed format
argument.
The bug is located in new_warning() and can be exploitated through the
locking of a player (the same attacker too) who is using a malformed
nickname.
Note that the EVENTLOG switch must be enabled for exploiting this
vulnerability (default is disabled).
from ntserv/warning.c:
void new_warning(int index, const char *fmt, ...) {
char temp[150];
va_list args;
va_start(args, fmt);
vsprintf(temp, fmt, args);
...
if (eventlog) {
char from_str[9]="WRN->\0\0\0";
strcat(from_str, me->p_mapchars);
pmessage2(0, 0, from_str, me->p_no, temp);
}
Proof of concept:
<http://aluigi.org/poc/netrekfs.zip> http://aluigi.org/poc/netrekfs.zip
ADDITIONAL INFORMATION
The information has been provided by <mailto:aluigi@autistici.org> Luigi
Auriemma.
The original article can be found at:
<http://aluigi.org/adv/netrekfs-adv.txt>
http://aluigi.org/adv/netrekfs-adv.txt
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