CVE-2018-1000857: log-user-session version 0.7 and earlier contains a Directory Traversal vulnerability in Main SUID-binary /usr

Q: How do I fix CVE-2018-1000857?

log-user-session: upgrade to newer than 0.7. Exact commands for each OS are on this page.

Q: Is CVE-2018-1000857 being exploited?

CVE-2018-1000857 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-1000857 affect?

CVE-2018-1000857 affects log-user-session. Severity is high (CVSS 8.8). 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 Malicio

Q: How urgent is CVE-2018-1000857?

Priority 58/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2018-1000857 is a high-severity flaw (CVSS 8.8) affecting log-user-session. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.3% (top 12%)
CISA exploited list	No
Weakness	CWE-22
Published	2018-12-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: open-systems

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-12-20 17:29 UTCPublished CVE record published
2026-06-17 01:33 UTCUpdated Record last modified

open-systems log-user-session UPGRADE

Affected: <= 0.7

Fixed in: newer than 0.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy log-user-session || rpm -q log-user-session || log-user-session --version

2. UPGRADE to newer than 0.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade log-user-session

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade log-user-session

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-1000857?

log-user-session: upgrade to newer than 0.7. Exact commands for each OS are on this page.

Is CVE-2018-1000857 being exploited?

CVE-2018-1000857 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-1000857 affect?

CVE-2018-1000857 affects log-user-session. Severity is high (CVSS 8.8). 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 Malicio

How urgent is CVE-2018-1000857?

Priority 58/100. High severity; Public exploit reference

References

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