From: Vladis Dronov <vdronov () redhat com> Date: Wed, 23 Aug 2017 07:47:02 -0400 (EDT) Heololo, A kernel data leak due to an out-of-bound read was found in Linux kernel in inet_diag_msg_sctp{,l}addr_fill() and sctp_get_sctp_info() functions present since v4.7-rc1 upto v4.13-rc6 including. A data leak happens when these functions fill in sockaddr data structures used to export socket's diagnostic information. As a result up to 100 bytes of the slab data could be leaked to a userspace. Details: it is leaking exactly 100 bytes of a kernel slab whenever we answer to a netlink request of type INET_DIAG_LOCALS or INET_DIAG_PEERS for a SCTP socket (e.g. sent by the 'ss' tool included in the 'iproute2' package with 'ss -Si' or 'ss -Sm'). A researcher of this flaw and a patch author is Stefano Brivio of the Red Hat. References: https://bugzilla.redhat.com/show_bug.cgi?id=1480266 https://marc.info/?t=150348787500002&r=1&w=2 Suggested patch: https://marc.info/?l=linux-netdev&m=150348777122761&w=2 Best regards, Vladis Dronov | Red Hat, Inc. | Product Security Engineer
Fix in 4.9.51, 4.13
