Date: Fri, 5 Oct 2018 18:54:06 +0200 From: Solar Designer <solar@...nwall.com> To: luo <a4651386@....com> Cc: oss-security@...ts.openwall.com Subject: Re: CVE-2018-17977: CentOS ipsec remote denial of service vulnerability On Fri, Oct 05, 2018 at 11:46:07PM +0800, luo wrote: > I don't know if it is correct to publish the complete information. It is. Linking to temporary resources like Google Drive isn't great, but luckily your message itself includes some detail. > > The Linux kernel 4.14.67 mishandles certain interaction among XFRM > > Netlink messages, IPPROTO_AH packets, and IPPROTO_IP packets, which > > allows local users to cause a denial of service (memory consumption > > and system hang) by leveraging root access to execute crafted > > applications, as demonstrated on CentOS 7. Since you say that "leveraging root access to execute crafted applications" is required, how is this a security issue? Also, since this setup has to be prepared locally, how is the attack "remote"? In other words, would a sysadmin plausibly make this kind of custom local setup, and why? If the answer is no, then I think there's no security issue here. Alexander
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