CVE-2018-1000857

Name: CVE-2018-1000857
Creator: NVD / NIST
Published: 2018-12-20T17:29:00.41+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.25%

Last modified Jun 17, 2026

CVE-2018-1000857 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. log-user-session version 0.7 and earlier contains a Directory Traversal vulnerability in Main SUID-binary /usr/local/bin/log-user-session that can result in User to root privilege escalation. This attack appear to be exploitable via Malicious unprivileged user executes the vulnerable binary/(remote) environment variable manipulation similar shell-shock also possible.. EPSS estimates a 3.25% chance of exploitation in the next 30 days.

Description

log-user-session version 0.7 and earlier contains a Directory Traversal vulnerability in Main SUID-binary /usr/local/bin/log-user-session that can result in User to root privilege escalation. This attack appear to be exploitable via Malicious unprivileged user executes the vulnerable binary/(remote) environment variable manipulation similar shell-shock also possible.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.25%

86.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Open-Systems	Log-User-Session	<= 0.7

References

https://www.halfdog.net/Security/2018/LogUserSessionLocalRootPrivilegeEscalation/Exploit, Third Party Advisory
https://www.halfdog.net/Security/2018/LogUserSessionLocalRootPrivilegeEscalation/Exploit, Third Party Advisory

Timeline

Published: Dec 20, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-1000857?

How severe is CVE-2018-1000857?

CVE-2018-1000857 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.25% probability of exploitation in the next 30 days.

How do I fix CVE-2018-1000857?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-1000857?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST