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CVE-2018-15687

systemd: chown_one() can dereference symlinks

HIGH
7
CVSS Score
Published: October 26, 2018 at 02:00 PM UTC
Updated: June 17, 2026 at 01:42 AM UTC
3 products affected across 3 vendorsUbuntu LinuxSystemdSystemd

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Severity
HIGH7
Exploit prediction
EPSS 1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
16.0418.0418.10
Systemd· Systemd Project
95%
235 ≤ v < 240
Affected range stops below 240, so it looks safe — our inference, not a vendor statement
Systemd· Systemd
60%
v ≤ 239

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

VDB Entryx_refsource_BIDBroken LinkThird Party Advisory
Source: [email protected]
http://www.securityfocus.com/bid/105748
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/systemd/systemd/pull/10517/commits
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/201810-10
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
Source: [email protected]
https://usn.ubuntu.com/3816-1/
Exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
Source: [email protected]
https://www.exploit-db.com/exploits/45715/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGH[email protected]
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-362

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