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CVE-2020-16123— Bypass of snapd pulseaudio restrictions

Quick assessment

Affected
Canonical pulseaudio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PulseAudio是一款用于POSIX OS的开源音频系统。该系统主要用于音频传输等。 PulseAudio 在Ubuntu系统中存在竞争条件问题漏洞，攻击者可利用该漏洞可以绕过对Ubuntu PulseAudio数据的访问限制，获取敏感信息。

CVSS 4.4 · Medium EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1001 · Data Obfuscation
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I. Basic Information for CVE-2020-16123

Vulnerability Information
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Vulnerability Title
Bypass of snapd pulseaudio restrictions
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
PulseAudio 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PulseAudio是一款用于POSIX OS的开源音频系统。该系统主要用于音频传输等。 PulseAudio 在Ubuntu系统中存在竞争条件问题漏洞，攻击者可利用该漏洞可以绕过对Ubuntu PulseAudio数据的访问限制，获取敏感信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical pulseaudio 1:13.99.3-1 ~ 1:13.99.3-1ubuntu2 -

II. Public POCs for CVE-2020-16123

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III. Intelligence Information for CVE-2020-16123

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Vendor Advisories for CVE-2020-16123 (1)

IV. Related Vulnerabilities

Same product: pulseaudio
Same vendor: Canonical
Same weakness: CWE-362

V. Comments for CVE-2020-16123

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