Date: Fri, 2 Sep 2022 11:49:46 +0200 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Subject: Re: Linux Kernel use-after-free write in netfilter On Thu, Aug 25, 2022 at 03:20:21PM +0200, Solar Designer wrote: > On Tue, May 31, 2022 at 10:00:32AM +0100, EDG EDG wrote: > > A use-after-free write vulnerability was identified within the > > netfilter subsystem > > which can be exploited to achieve privilege escalation to root. > > > > In order to trigger the issue it requires the ability to create user/net > > namespaces. > > > > This issue has been fixed within the following commit: > > > > https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/net/netfilter?id=520778042ccca019f3ffa136dd0ca565c486cedd > > > > The issue was previously confirmed on the latest linux master (commit > > 143a6252e1b8ab424b4b293512a97cca7295c182) and we have confirmed it can be > > exploited for privilege escalation on Ubuntu 22.04 (Linux kernel > > 5.15.0-27-generic). > [...] > > # POC Code > [...] > > printf("should have triggered KASAN\n"); > > While the message above included PoC code, there's now also a blog post > and GitHub repo with a full exploit: > > https://blog.theori.io/research/CVE-2022-32250-linux-kernel-lpe-2022/ > https://github.com/theori-io/CVE-2022-32250-exploit > > "In this post, we have shown the process of exploiting CVE-2022-32250. > We were able to leak KASLR and overwrite modprobe_path by utilizing the > mqueue functions, and as a result, we successfully gained root > privileges in Ubuntu 22.04." The Exploit Development Group (EDG) at NCC Group, who discovered this vulnerability and started this thread, have just published their own write-up about its exploitation: https://research.nccgroup.com/2022/09/01/settlers-of-netlink-exploiting-a-limited-uaf-in-nf_tables-cve-2022-32250/ Alexander
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