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

7HIGH

Key Information:

Vendor

Systemd

Status
Systemd
Vendor
CVE Published:
26 October 2018

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2018-15687?

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 Version(s)

systemd <= 239

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2018-15687 - Proof of Concept

References

https://security.gentoo.org/glsa/201810-10
vendor-advisoryx_refsource_GENTOO
https://github.com/systemd/systemd/pull/10517/commits
x_refsource_MISC
http://www.securityfocus.com/bid/105748
vdb-entryx_refsource_BID

CVSS V3.1

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

CVSS V3.0

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jann Horn
.