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CVE-2021-32548— apport read_file() function could follow maliciously constructed symbolic links

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.

Canonical Ubuntu是英国科能（Canonical）公司的一套以桌面应用为主的GNU/Linux操作系统。 Ubuntu Apport 中存在安全漏洞，该漏洞源于错误地处理了某些信息收集操作，攻击者可利用该漏洞可以使用这些问题作为管理员读写任意文件。以下产品及版本受到影响：Ubuntu 14.04 ESM、Ubuntu 16.04 ESM。

CVSS 7.3 · High EPSS 0.29% · P22

Possible ATT&CK Techniques 1 AI

T1552.003 · Shell History
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I. Basic Information for CVE-2021-32548

Vulnerability Information
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Vulnerability Title
apport read_file() function could follow maliciously constructed symbolic links
Source: CVE Program / CVE List V5
Vulnerability Description
It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the openjdk-8 package apport hooks, it could expose private data to other local users.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Ubuntu Apport 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical Ubuntu是英国科能（Canonical）公司的一套以桌面应用为主的GNU/Linux操作系统。 Ubuntu Apport 中存在安全漏洞，该漏洞源于错误地处理了某些信息收集操作，攻击者可利用该漏洞可以使用这些问题作为管理员读写任意文件。以下产品及版本受到影响：Ubuntu 14.04 ESM、Ubuntu 16.04 ESM。
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 ~ 2.20.1-0ubuntu2.30+esm1 -

II. Public POCs for CVE-2021-32548

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III. Intelligence Information for CVE-2021-32548

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Other References for CVE-2021-32548 (1)

Same Patch Batch · Canonical · 2021-06-12 · 11 CVEs total

CVE-2021-32555 7.3 HIGH apport read_file() function could follow maliciously constructed symbolic links
CVE-2021-32553 7.3 HIGH apport read_file() function could follow maliciously constructed symbolic links
CVE-2021-32554 7.3 HIGH apport read_file() function could follow maliciously constructed symbolic links
CVE-2021-32552 7.3 HIGH apport read_file() function could follow maliciously constructed symbolic links
CVE-2021-32550 7.3 HIGH apport read_file() function could follow maliciously constructed symbolic links
CVE-2021-32551 7.3 HIGH apport read_file() function could follow maliciously constructed symbolic links
CVE-2021-32549 7.3 HIGH apport read_file() function could follow maliciously constructed symbolic links
CVE-2021-32547 7.3 HIGH apport read_file() function could follow maliciously constructed symbolic links
CVE-2021-32557 5.2 MEDIUM apport process_report() arbitrary file write
CVE-2021-32556 3.8 LOW apport get_modified_conffiles() function command injection

IV. Related Vulnerabilities

Same product: apport
Same vendor: Canonical
Same weakness: CWE-59

V. Comments for CVE-2021-32548

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