DoS vulnerability (invalid player id spam)

[LTGT 2258]

This is a fix for a DoS Vulnerability where invalid player ids are spammed (i.e. HEADER_CG_CHARACTER_SELECT),

you can confirm this by looking in the syslog for a bunch of [PLAYER_LOAD] Load from PlayerDB pid[0].

 

to fix this:

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this fix will make sure the player gets disconnected upon choosing an invalid character, making it harder to spam and making rate limits effective again

Thanks to everyone from sura-head.

Edited November 12, 2022 by LTGT
added support for different packets

[Amun 3221]

What's dumb is that they checked for the PID when deleting a player

	if (!c_rAccountTable.players[pinfo->index].dwID)
	{
		sys_err("PlayerDelete: Wrong Social ID index %d, login: %s", pinfo->index, c_rAccountTable.login);
		d->Packet(encode_byte(HEADER_GC_CHARACTER_DELETE_WRONG_SOCIAL_ID), 1);
		return;
	}

but they didn't check when selecting it(they've done the same shit in ::ChangeName, the method above ::CharacterSelect).

I advise you to check all packets using indexes sent by the client, because it's not just the one @ LTGT posted.

[LTGT 2258]

5 hours ago, Amun said:

What's dumb is that they checked for the PID when deleting a player

	if (!c_rAccountTable.players[pinfo->index].dwID)
	{
		sys_err("PlayerDelete: Wrong Social ID index %d, login: %s", pinfo->index, c_rAccountTable.login);
		d->Packet(encode_byte(HEADER_GC_CHARACTER_DELETE_WRONG_SOCIAL_ID), 1);
		return;
	}

but they didn't check when selecting it(they've done the same shit in ::ChangeName, the method above ::CharacterSelect).

I advise you to check all packets using indexes sent by the client, because it's not just the one @ LTGT posted.

Main post has been adjusted to support them as well.

[ReFresh 3151]

@ LTGTJust a little detail... there isn't any player_index variable.

One step in your tutorial must look like this:

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[Denizeri24 43]

Edited November 13, 2022 by Metin2 Dev
Core X - External 2 Internal

[Helia01 3405]

On 11/13/2022 at 4:24 AM, Denizeri24 said:

Edited November 29, 2022 by Helia01