A local privilege escalation vulnerability has been found in the Linux 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.
A local privilege escalation vulnerability has been found in the Linux 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.
http://www.openwall.com/lists/oss-security/2017/03/29/2 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=677e806da4d916052585301785d847c3b3e6186a https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f843ee6dd019bcece3e74e76ad9df0155655d0df
This is the local privilege escalation used against Ubuntu during the 2017 pwn2own contest.
Vulmon