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CVE-2020-8831— World writable root owned lock file created in user controllable location

Quick assessment

Affected
Canonical Apport
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.

Apport是一款用于收集并反馈错误信息（当应用程序崩溃时操作系统认为有用的信息）的工具包。 Apport中存在安全漏洞，该漏洞源于为创建的lock文件分配了安全的权限。本地攻击者可通过实施符号链接攻击利用该漏洞提升权限。

CVSS 6.5 · Medium EPSS 0.65% · P49
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I. Basic Information for CVE-2020-8831

Vulnerability Information
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Vulnerability Title
World writable root owned lock file created in user controllable location
Source: CVE Program / CVE List V5
Vulnerability Description
Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. This allows for a symlink attack if an attacker were to create a symlink at /var/lock/apport, changing apport's lock file location. This file could then be used to escalate privileges, for example. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在具有不安全权限的目录中创建临时文件
Source: CVE Program / CVE List V5
Vulnerability Title
Apport 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apport是一款用于收集并反馈错误信息（当应用程序崩溃时操作系统认为有用的信息）的工具包。 Apport中存在安全漏洞，该漏洞源于为创建的lock文件分配了安全的权限。本地攻击者可通过实施符号链接攻击利用该漏洞提升权限。
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 Apport 2.20.1 ~ 2.20.1-0ubuntu2.23 -

II. Public POCs for CVE-2020-8831

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III. Intelligence Information for CVE-2020-8831

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Vendor Advisories for CVE-2020-8831 (2)

IV. Related Vulnerabilities

Same product: Apport
Same vendor: Canonical
Same weakness: CWE-379

V. Comments for CVE-2020-8831

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