linux-kernel - Re: [PATCH net-next v2] icmp: Add icmp_timestamp_ignore_all to control ICMP

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Date: Tue, 21 May 2024 11:25:02 +0200
From: Florian Westphal <fw@...len.de>
To: ye.xingchen@....com.cn
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, corbet@....net, dsahern@...nel.org,
	ncardwell@...gle.com, soheil@...gle.com, haiyangz@...rosoft.com,
	lixiaoyan@...gle.com, mfreemon@...udflare.com,
	david.laight@...lab.com, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	fan.yu9@....com.cn, he.peilin@....com.cn, xu.xin16@....com.cn,
	yang.yang29@....com.cn, yang.guang5@....com.cn,
	zhang.yunkai@....com.cn
Subject: Re: [PATCH net-next v2] icmp: Add icmp_timestamp_ignore_all to
 control ICMP_TIMESTAMP

ye.xingchen@....com.cn <ye.xingchen@....com.cn> wrote:
> From: YeXingchen <ye.xingchen@....com.cn>
> 
> The CVE-1999-0524 vulnerability is associated with ICMP
> timestamp messages, which can be exploited to conduct 
> a denial-of-service (DoS) attack. In the Vulnerability
> Priority Rating (VPR) system, this vulnerability was 
> rated as a medium risk in May of this year.
> Link:https://www.tenable.com/plugins/nessus/10113

Please explain at least one scenario where this is a problem.

AFAICS there is none and Linux is not affected by this.

> To protect embedded systems that cannot run firewalls
> from attacks exploiting the CVE-1999-0524 vulnerability,
> the icmp_timestamp_ignore_all sysctl is offered as

If there is an actual problem, then this should be on by default
or the entire feature should be removed.

But I don't think there is a problem in the first place.