CVE-2018-10933 — libssh-mirror
CRITICALCVE-2018-10933 is a critical-severity (CVSS 9.1) CWE-592 vulnerability. 33 public exploit references exist, so weaponization risk is real. A fix is available — see the affected versions and patch details below.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2018-10933 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 397,508 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
A vulnerability was found in libssh's server-side state machine before versions 0.7.6 and 0.8.4. A malicious client could create channels without first performing authentication, resulting in unauthorized access.
Affected Products
ubuntu linuxcanonicaldebian linuxdebianlibsshlibsshoncommand unified managernetapponcommand workflow automationnetappsnapcenternetappResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
libSSH - Authentication Bypass
by Dayanç Soyadlı · Oct 18, 2018
LibSSH 0.7.6 / 0.8.4 - Unauthorized Access
by jas502n · Oct 20, 2018
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Fix
Upgrade the affected component to the fixed release for CVE-2018-10933, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This vulnerability affects libssh shipped in Red Hat Enterprise Linux 7 Extras. No libssh packages are included in Red Hat Enterprise Linux 6 and earlier. This issue does not affect libssh2 or openssh. This issue can only be affect applications that use libssh to implement an SSH server; SSH client functionality is…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Enterprise Linux 7 Extras | cockpit-0:176-4.el7 | RHBA-2018:3712 |
Frequently Asked Questions
Is CVE-2018-10933 in your dependencies?
Find it across , including transitive dependencies.