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CVE-2020-8833— Apport race condition in crash report permissions

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。本地攻击者可通过实施符号链接攻击利用该漏洞读取任意文件。

CVSS 5.6 · Medium EPSS 0.34% · P28

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2020-8833

Vulnerability Information
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Vulnerability Title
Apport race condition in crash report permissions
Source: CVE Program / CVE List V5
Vulnerability Description
Time-of-check Time-of-use Race Condition vulnerability on crash report ownership change in Apport allows for a possible privilege escalation opportunity. If fs.protected_symlinks is disabled, this can be exploited between the os.open and os.chown calls when the Apport cron script clears out crash files of size 0. A symlink with the same name as the deleted file can then be created upon which chown will be called, changing the file owner to root. 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:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Apport 安全漏洞
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。本地攻击者可通过实施符号链接攻击利用该漏洞读取任意文件。
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-2020-8833

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III. Intelligence Information for CVE-2020-8833

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Vendor Advisories for CVE-2020-8833 (2)

Other References for CVE-2020-8833 (1)

IV. Related Vulnerabilities

Same product: Apport
Same vendor: Canonical
Same weakness: CWE-367

V. Comments for CVE-2020-8833

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