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CVE-2020-16126— accountsservice drops ruid, allows unprivileged users to send it signals

Quick assessment

Affected
Freedesktop accountsservice
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ubuntu AccountsService是个人开发者的一款用于在Linux上管理账户的软件。该软件提供对帐户的查询和操作功能，另外提供一组基于useradd、usermod等命令的API。 AccountsService Privilege Drop 存在安全漏洞，该漏洞可触发致命错误，进而导致触发拒绝服务。

CVSS 3.3 · Low EPSS 0.54% · P43

Possible ATT&CK Techniques 1 AI

T1053.003 · Cron
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I. Basic Information for CVE-2020-16126

Vulnerability Information
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Vulnerability Title
accountsservice drops ruid, allows unprivileged users to send it signals
Source: CVE Program / CVE List V5
Vulnerability Description
An Ubuntu-specific modification to AccountsService in versions before 0.6.55-0ubuntu13.2, among other earlier versions, improperly dropped the ruid, allowing untrusted users to send signals to AccountService, thus stopping it from handling D-Bus messages in a timely fashion.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Ubuntu AccountsService 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ubuntu AccountsService是个人开发者的一款用于在Linux上管理账户的软件。该软件提供对帐户的查询和操作功能，另外提供一组基于useradd、usermod等命令的API。 AccountsService Privilege Drop 存在安全漏洞，该漏洞可触发致命错误，进而导致触发拒绝服务。
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
Freedesktop accountsservice 0.6.35-0ubuntu7.3 ~ 0.6.35-0ubuntu7.3+esm2 -

II. Public POCs for CVE-2020-16126

# POC Description Source Link Shenlong Link
1 A bash script exploit of [CVE-2020-16126/CVE-2020-16127] to achieve privilege escalation.Ubuntu 16.04-20.04 LTS本地提权漏洞利用脚本。要求拥有Gnome图形化环境。 https://github.com/zev3n/Ubuntu-Gnome-privilege-escalation POC Details
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III. Intelligence Information for CVE-2020-16126

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Other References for CVE-2020-16126 (1)

IV. Related Vulnerabilities

Same product: accountsservice
Same vendor: Freedesktop
Same weakness: CWE-269

V. Comments for CVE-2020-16126

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