CVE-2018-10933

libssh Authentication Bypass Scanner

Severity Score

9.1

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se ha detectado una vulnerabilidad en la máquina de estado del lado del servidor de libssh en versiones anteriores a la 0.7.6 y 0.8.4. Un cliente malicioso podría crear canales sin realizar antes la autenticación, lo que resulta en un acceso no autorizado.

Peter Winter-Smith of NCC Group discovered that libssh, a tiny C SSH library, contains an authentication bypass vulnerability in the server code. An attacker can take advantage of this flaw to successfully authenticate without any credentials by presenting the server an SSH2_MSG_USERAUTH_SUCCESS message in place of the SSH2_MSG_USERAUTH_REQUEST message which the server would expect to initiate authentication. For the stable distribution (stretch), this problem has been fixed in version 0.7.3-2+deb9u1.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-05-09 CVE Reserved
2018-10-17 CVE Published
2018-10-17 First Exploit
2024-08-05 CVE Updated
2025-07-16 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-287: Improper Authentication
CWE-592: DEPRECATED: Authentication Bypass Issues

CAPEC

References (52)

URL	Tag	Source
http://www.securityfocus.com/bid/105677	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10933	Issue Tracking
https://lists.debian.org/debian-lts-announce/2018/10/msg00010.html	Mailing List
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0016	Third Party Advisory
https://security.netapp.com/advisory/ntap-20190118-0002	Third Party Advisory

URL	Date	SRC
https://packetstorm.news/files/id/181227	2024-09-01
https://packetstorm.news/files/id/151477	2019-02-03
https://packetstorm.news/files/id/149865	2018-10-19
https://www.exploit-db.com/exploits/46307	2019-02-03
https://www.exploit-db.com/exploits/45638	2024-08-05
https://github.com/blacknbunny/CVE-2018-10933	2023-02-20
https://github.com/SoledaD208/CVE-2018-10933	2018-10-22
https://github.com/jas502n/CVE-2018-10933	2018-10-20
https://github.com/Virgula0/POC-CVE-2018-10933	2018-10-25
https://github.com/shifa123/pythonprojects-CVE-2018-10933	2018-10-21
https://github.com/kn6869610/CVE-2018-10933	2018-10-17
https://github.com/xFreed0m/CVE-2018-10933	2019-12-05
https://github.com/r3dxpl0it/CVE-2018-10933	2018-10-24
https://github.com/HSw109/CVE-2018-10933	2024-04-10
https://github.com/Bifrozt/CVE-2018-10933	2018-10-23
https://github.com/youkergav/CVE-2018-10933	2020-03-31
https://github.com/ensimag-security/CVE-2018-10933	2018-11-28
https://github.com/lalishasanduwara/CVE-2018-10933	2020-05-12
https://github.com/SilasSpringer/CVE-2018-10933	2022-12-01
https://github.com/hook-s3c/CVE-2018-10933	2018-10-17
https://github.com/Rubikcuv5/CVE-2018-10933	2022-07-28
https://github.com/kristyna-mlcakova/CVE-2018-10933	2020-04-19
https://github.com/sambiyal/CVE-2018-10933-POC	2018-11-21
https://github.com/throwawayaccount12312312/precompiled-CVE-2018-10933	2018-10-24
https://github.com/cyberharsh/Libssh-server-CVE-2018-10933	2020-06-20
https://github.com/crispy-peppers/Libssh-server-CVE-2018-10933	2019-11-23
https://github.com/likescam/CVE-2018-10933-libSSH-Authentication-Bypass	2018-10-18
https://github.com/jobroche/libssh-scanner	2024-10-17
https://github.com/likekabin/CVE-2018-10933_ssh	2024-08-12
https://github.com/likekabin/CVE-2018-10933-libSSH-Authentication-Bypass	2018-10-18
https://github.com/marco-lancini/hunt-for-cve-2018-10933	2024-08-12
https://github.com/hackerhouse-opensource/cve-2018-10933	2024-09-26
https://github.com/cve-2018/cve-2018-10933	2018-10-23
https://github.com/ninp0/cve-2018-10933_poc	2018-10-22
https://github.com/pghook/CVE-2018-10933_Scanner	2020-05-15
https://github.com/ivanacostarubio/libssh-scanner	2019-02-24
https://github.com/reanimat0r/bpnd-libssh	2018-10-24
https://github.com/0xadaw/libSSH-bypass	2018-11-16
https://github.com/nikhil1232/LibSSH-Authentication-Bypass	2023-09-12
https://github.com/Kurlee/LibSSH-exploit	2019-02-10
https://github.com/JoSecMx/CVE-2018-10933_Scanner	2020-05-15
https://github.com/bidaoui4905/CVE-2018-10933	2025-07-07

URL	Date	SRC
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html	2019-10-09

URL	Date	SRC
https://usn.ubuntu.com/3795-1	2019-10-09
https://usn.ubuntu.com/3795-2	2019-10-09
https://www.debian.org/security/2018/dsa-4322	2019-10-09
https://www.libssh.org/security/advisories/CVE-2018-10933.txt	2018-10-16

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libssh Search vendor "Libssh"		Libssh Search vendor "Libssh" for product "Libssh"				>= 0.6.0 < 0.7.6 Search vendor "Libssh" for product "Libssh" and version " >= 0.6.0 < 0.7.6"		-		Affected
Libssh Search vendor "Libssh"		Libssh Search vendor "Libssh" for product "Libssh"				>= 0.8.0 < 0.8.4 Search vendor "Libssh" for product "Libssh" and version " >= 0.8.0 < 0.8.4"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.10"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				7.0 Search vendor "Redhat" for product "Enterprise Linux" and version "7.0"		-		Affected
Netapp Search vendor "Netapp"		Oncommand Unified Manager Search vendor "Netapp" for product "Oncommand Unified Manager"				>= 7.3 Search vendor "Netapp" for product "Oncommand Unified Manager" and version " >= 7.3"		windows		Affected
Netapp Search vendor "Netapp"		Oncommand Unified Manager Search vendor "Netapp" for product "Oncommand Unified Manager"				>= 9.4 Search vendor "Netapp" for product "Oncommand Unified Manager" and version " >= 9.4"		vsphere		Affected
Netapp Search vendor "Netapp"		Oncommand Workflow Automation Search vendor "Netapp" for product "Oncommand Workflow Automation"				-		-		Affected
Netapp Search vendor "Netapp"		Snapcenter Search vendor "Netapp" for product "Snapcenter"				-		-		Affected
Netapp Search vendor "Netapp"		Storage Automation Store Search vendor "Netapp" for product "Storage Automation Store"				-		-		Affected
Oracle Search vendor "Oracle"		Mysql Workbench Search vendor "Oracle" for product "Mysql Workbench"				<= 8.0.13 Search vendor "Oracle" for product "Mysql Workbench" and version " <= 8.0.13"		-		Affected