#VU15674 Race condition in systemd - CVE-2018-15687

Vulnerability identifier: #VU15674

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-15687

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
systemd
Server applications / Other server solutions

Vendor: Freedesktop.org

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to race condition in chown_one() of systemd. A remote attacker can bypass security restriction and set arbitrary permissions on arbitrary files.

Mitigation
Install update from vendor's website.

Vulnerable software versions

systemd: 174 - 239

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External links
https://github.com/systemd/systemd/pull/10517/commits

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.