Re: CVE-2017-7184: kernel: Local privilege escalation in XFRM framework

[Lokesh Ubuntu <lokesh.ubuntu () gmail com>]

Is there any POC for this to conclude? Thanks.

Regards, Lokesh

On Mar 30, 2017 03:14, "Tyler Hicks" <tyhicks () canonical 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