Symlink attack in GNU systemd



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-6954
CWE-ID CWE-61
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 systemd
Server applications / Other server solutions

Vendor Freedesktop.org

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Symlink attack

EUVDB-ID: #VU11185

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-6954

CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following

Exploit availability: No

Description

The vulnerability allows a local attacker to launch symlink attack on the target system.

The weakness exists in the systemd-tmpfiles feature due to improper handling of symlinks in nonterminal path components. A local attacker can gain unauthorized access to arbitrary files.

Mitigation

Install update from vendor's website.

Vulnerable software versions

systemd: 200 - 237

CPE2.3 External links

https://github.com/systemd/systemd/issues/7986


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. However, proof of concept for this vulnerability is available.



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