The IPT_SO_SET_REPLACE setsockopt implementation in the netfilter subsystem in the Linux kernel before 4.6 allows local users to cause a denial of service (out-of-bounds read) or possibly obtain sensitive information from kernel heap memory by leveraging in-container root access to provide a crafted offset value that leads to crossing a ruleset blob boundary.

The IPT_SO_SET_REPLACE setsockopt implementation in the netfilter subsystem in the Linux kernel before 4.6 allows local users to cause a denial of service (out-of-bounds read) or possibly obtain sensitive information from kernel heap memory by leveraging in-container root access to provide a crafted offset value that leads to crossing a ruleset blob boundary.

kernel-debug-4.8.13-1.1 on GA media

kernel: netfilter: missing bounds check in ipt_entry structure kernel: compat IPT_SO_SET_REPLACE setsockopt kernel: out of bounds reads when processing IPT_SO_SET_REPLACE setsockopt kernel: overlayfs: missing upper dentry verification before unlink and rename kernel: vfs: missing detection of hardlinks in vfs_rename() on overlayfs

Affected: Ubuntu:14.04:LTS: linux, Ubuntu:14.04:LTS: linux-lts-utopic, Ubuntu:14.04:LTS: linux-lts-vivid, Ubuntu:14.04:LTS: linux-lts-wily, Ubuntu:14.04:LTS: linux-lts-xenial, Ubuntu:16.04:LTS: linux, Ubuntu:16.04:LTS: linux-raspi2, Ubuntu:16.04:LTS: linux-snapdragon, Ubuntu:18.04:LTS: linux-azure, Ubuntu:18.04:LTS: linux-gcp and 18 more

The IPT_SO_SET_REPLACE setsockopt implementation in the netfilter subsystem in the Linux kernel before 4.6 allows local users to cause a denial of service (out-of-bounds read) or possibly obtain sensitive information from kernel heap memory by leveraging in-container root access to provide a crafted offset value that leads to crossing a ruleset blob boundary.

Ein lokaler Angreifer kann mehrere Schwachstellen in Linux Kernel ausnutzen, um seine Privilegien zu erhöhen und um einen Denial of Service Zustand herbeizuführen.