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CVE-2019-7303

Status Candidate

Overview

A vulnerability in the seccomp filters of Canonical snapd before version 2.37.4 allows a strict mode snap to insert characters into a terminal on a 64-bit host. The seccomp rules were generated to match 64-bit ioctl(2) commands on a 64-bit platform; however, the Linux kernel only uses the lower 32 bits to determine which ioctl(2) commands to run. This issue affects: Canonical snapd versions prior to 2.37.4.

Related Files

Ubuntu Security Notice USN-3917-1
Posted Mar 22, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3917-1 - The snapd default seccomp filter for strict mode snaps blocks the use of the ioctl system call when used with TIOCSTI as the second argument to the system call. Jann Horn discovered that this restriction could be circumvented on 64 bit architectures. A malicious snap could exploit this to bypass intended access restrictions to insert characters into the terminal's input queue. On Ubuntu, snapd typically will have already automatically refreshed itself to snapd 2.37.4 which is unaffected.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2019-7303
SHA-256 | 13a2bdb1b443d25b262c5bc7b4b990dd9fd330319e9950c08bf7851a447bfb28
snap seccomp TIOCSTI Blacklist Circumvention
Posted Mar 22, 2019
Authored by Google Security Research

snap uses a seccomp filter with a blacklist for TIOCSTI can be circumvented.

tags | exploit
advisories | CVE-2019-7303
SHA-256 | dfe93c7e631a95ac963d06c283dbec8208a04af5c084bb298266d147901f846c
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