Vulnerability · Published Dec 3, 2020 · Assigned by canonical

CVE-2020-16123Bypass of snapd pulseaudio restrictions

Medium 4.4

In plain English

A medium-severity race condition in pulseaudio from Canonical. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 3.1)4.4Medium

Exploit odds (30 days)0.3%top 75.1% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

An Ubuntu-specific patch in PulseAudio created a race condition where the snap policy module would fail to identify a client connection from a snap as coming from a snap if SCM_CREDENTIALS were missing, allowing the snap to connect to PulseAudio without proper confinement. This could be exploited by an attacker to expose sensitive information. Fixed in 1:13.99.3-1ubuntu2, 1:13.99.2-1ubuntu2.1, 1:13.99.1-1ubuntu3.8, 1:11.1-1ubuntu7.11, and 1:8.0-0ubuntu3.15.

Affected products (as reported)

Vendor	Product	Versions
Canonical	pulseaudio	1:13.99.3-1 – before 1:13.99.3-1ubuntu21:13.99.2-1 – before 1:13.99.2-1ubuntu2.11:13.99.1-1 – before 1:13.99.1-1ubuntu3.81:11.1-1 – before 1:11.1-1ubuntu7.111:8.0-0 – before 1:8.0-0ubuntu3.15

Weakness: CWE-362 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N

References

https://launchpad.net/bugs/1895928 vendor-advisory, x_refsource_UBUNTU
https://ubuntu.com/USN-4640-1 vendor-advisory, x_refsource_UBUNTU