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CVE-2018-6557— Insecure temporary file use in base-files

Quick assessment

Affected
Ubuntu base-files
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是英国科能软件（Canonical）公司的一套以桌面应用为主的GNU/Linux操作系统。 Ubuntu 18.04 LTS 10.1ubuntu2.2 版本之前和 Ubuntu 18.10 10.1ubuntu6 版本之前存在后置链接漏洞，该漏洞源于基本文件包中的 MOTD 更新脚本错误地处理了临时文件。 如果内核符号链接限制被禁用，本地攻击者可能会利用此问题导致拒绝服务或提升权限。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.36% · P30
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I. Basic Information for CVE-2018-6557

Vulnerability Information
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Vulnerability Title
Insecure temporary file use in base-files
Source: CVE Program / CVE List V5
Vulnerability Description
The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical Ubuntu 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical Ubuntu是英国科能软件（Canonical）公司的一套以桌面应用为主的GNU/Linux操作系统。 Ubuntu 18.04 LTS 10.1ubuntu2.2 版本之前和 Ubuntu 18.10 10.1ubuntu6 版本之前存在后置链接漏洞，该漏洞源于基本文件包中的 MOTD 更新脚本错误地处理了临时文件。 如果内核符号链接限制被禁用，本地攻击者可能会利用此问题导致拒绝服务或提升权限。
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
Ubuntu base-files unspecified ~ 10.1ubuntu2.2 -

II. Public POCs for CVE-2018-6557

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III. Intelligence Information for CVE-2018-6557

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Vendor Advisories for CVE-2018-6557 (3)

IV. Related Vulnerabilities

Same vendor: Ubuntu

V. Comments for CVE-2018-6557

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