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CVE-2018-15687— systemd: chown_one() can dereference symlinks

Quick assessment

Affected
systemd systemd
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.

systemd是德国软件开发者Lennart Poettering和其他人共同研发的一款基于Linux的系统和服务管理器，它兼容了SysV和LSB的启动脚本，且提供了一个用来表示系统服务间依赖关系的框架。 systemd 239及之前版本中的‘chown_one()’函数存在竞争条件漏洞。攻击者可利用该漏洞对任意文件设置任意权限。

AI Predicted 7.8 Difficulty: Hard EPSS 1.06% · P63

Public Exploits 1

ExploitDB · 1 EDB-45715 [local]

Possible ATT&CK Techniques 1 AI

T1565 · Data Manipulation
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I. Basic Information for CVE-2018-15687

Vulnerability Information
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Vulnerability Title
systemd: chown_one() can dereference symlinks
Source: CVE Program / CVE List V5
Vulnerability Description
A race condition in chown_one() of systemd allows an attacker to cause systemd to set arbitrary permissions on arbitrary files. Affected releases are systemd versions up to and including 239.
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
systemd 竞争条件漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
systemd是德国软件开发者Lennart Poettering和其他人共同研发的一款基于Linux的系统和服务管理器，它兼容了SysV和LSB的启动脚本，且提供了一个用来表示系统服务间依赖关系的框架。 systemd 239及之前版本中的‘chown_one()’函数存在竞争条件漏洞。攻击者可利用该漏洞对任意文件设置任意权限。
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
systemd systemd unspecified ~ 239 -

II. Public POCs for CVE-2018-15687

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III. Intelligence Information for CVE-2018-15687

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Patches & Fixes for CVE-2018-15687 (1)

Vendor Advisories for CVE-2018-15687 (3)

Exploits & Public PoCs for CVE-2018-15687 (1)

Same Patch Batch · systemd · 2018-10-26 · 3 CVEs total

CVE-2018-15686 systemd: reexec state injection: fgets() on overlong lines leads to line splitting
CVE-2018-15688 Out-of-Bounds write in systemd-networkd dhcpv6 option handling

IV. Related Vulnerabilities

Same product: systemd
Same vendor: systemd

V. Comments for CVE-2018-15687

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