90 lines
No EOL
2 KiB
Text
90 lines
No EOL
2 KiB
Text
#######################################################################
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Luigi Auriemma
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Application: Netrek
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http://www.netrek.org
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Versions: <= 2.12.0 (Vanilla server)
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Platforms: *nix and Windows
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Bug: format string
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Exploitation: remote (in-game)
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Date: 02 Mar 2007
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Author: Luigi Auriemma
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e-mail: aluigi@autistici.org
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web: aluigi.org
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#######################################################################
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1) Introduction
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2) Bug
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3) The Code
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4) Fix
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#######################################################################
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===============
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1) Introduction
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===============
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Netrek is a well known real-time strategy game inspired to Star Trek.
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#######################################################################
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======
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2) Bug
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======
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The Vanilla server is affected by a format string vulnerability caused
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by the calling of the pmessage2() function without the needed format
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argument.
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The bug is located in new_warning() and can be exploitated through the
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locking of a player (the same attacker too) who is using a malformed
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nickname.
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Note that the EVENTLOG switch must be enabled for exploiting this
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vulnerability (default is disabled).
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from ntserv/warning.c:
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void new_warning(int index, const char *fmt, ...) {
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char temp[150];
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va_list args;
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va_start(args, fmt);
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vsprintf(temp, fmt, args);
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...
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if (eventlog) {
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char from_str[9]="WRN->\0\0\0";
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strcat(from_str, me->p_mapchars);
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pmessage2(0, 0, from_str, me->p_no, temp);
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}
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#######################################################################
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===========
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3) The Code
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===========
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http://aluigi.org/poc/netrekfs.zip
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https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/3399.zip (03022007-netrekfs.zip)
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#######################################################################
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======
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4) Fix
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======
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Version 2.12.1
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#######################################################################
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# milw0rm.com [2007-03-02] |