Permissions, Privileges, and Access Controls in Snapd - CVE-2019-7303

Vulnerability identifier: #VU18064

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2019-7303

CWE-ID: CWE-264

Exploitation vector: Local access

Exploit availability: No public exploit available

Vendor: snapcore

Affected software:
Snapd

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to incorrect implementation of the snapd default seccomp filter for strict mode snaps blocks on 64-bit systems that was supposed to prevent the use of the TIOCSTI ioctl. A malicious snap can bypass intended access restrictions and insert characters into the terminal’s input queue.

Install updates from vendor's website.

• https://usn.ubuntu.com/3917-1/
• https://bugs.launchpad.net/snapd/+bug/1812973
• https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-7303.html