Date: Thu, 30 Mar 2017 08:48:21 +0530 From: Lokesh Ubuntu <lokesh.ubuntu@...il.com> To: oss-security@...ts.openwall.com Cc: security@...ntu.com Subject: Re: CVE-2017-7184: kernel: Local privilege escalation in XFRM framework Is there any POC for this to conclude? Thanks. Regards, Lokesh On Mar 30, 2017 03:14, "Tyler Hicks" <tyhicks@...onical.com> wrote: > A security issue was reported by ZDI, on behalf of Chaitin Security > Research Lab, against the Linux kernel in Ubuntu. It also affected the > upstream kernel. > > Chaitin Security Research Lab discovered that xfrm_replay_verify_len(), > as called by xfrm_new_ae(), did not verify that the user-specified > replay_window was within the replay state buffer. > > This allowed for out-of-bounds reads and writes of kernel memory. > Chaitin Security showed that this can lead to local privilege escalation > by using user namespaces in order to configure XFRM. XFRM configuration > requires CAP_NET_ADMIN so this issue is mitigated in kernels which do > not enable user namespaces by default. > > Fixes: > - https://git.kernel.org/linus/677e806da4d916052585301785d847c3b3e6186a > - https://git.kernel.org/linus/f843ee6dd019bcece3e74e76ad9df0155655d0df > > Tyler > > >
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