Privilege escalation in systemd

1) Input validation error

EUVDB-ID: #VU29540

Risk: Low

CVSSv4.0: 7.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Clear]

CVE-ID: CVE-2017-1000082

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to systemd fails to safely parse usernames starting with a numeric digit (e.g. "0day"), running the service in question with root privileges rather than the user intended.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

systemd: 200 - 233

CPE2.3

• cpe:2.3:a:freedesktop_org:systemd:200:*:*:*:*:*:*:*
• cpe:2.3:a:freedesktop_org:systemd:201:*:*:*:*:*:*:*
• cpe:2.3:a:freedesktop_org:systemd:202:*:*:*:*:*:*:*

External links

https://www.openwall.com/lists/oss-security/2017/07/02/1
https://www.securityfocus.com/bid/99507
https://www.securitytracker.com/id/1038839
https://github.com/systemd/systemd/issues/6237

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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