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Vulnerability Details : CVE-2018-10933

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.
Publish Date : 2018-10-17 Last Update Date : 2018-10-23
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- CVSS Scores & Vulnerability Types

CVSS Score
6.4
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 287

- Products Affected By CVE-2018-10933

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 14.04 ~~lts~~~ Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 16.04 ~~lts~~~ Version Details Vulnerabilities
3 OS Canonical Ubuntu Linux 18.04 ~~lts~~~ Version Details Vulnerabilities
4 OS Debian Debian Linux 9.0 Version Details Vulnerabilities
5 Application Libssh Libssh 0.6.0 Version Details Vulnerabilities
6 Application Libssh Libssh 0.6.1 Version Details Vulnerabilities
7 Application Libssh Libssh 0.6.2 Version Details Vulnerabilities
8 Application Libssh Libssh 0.6.3 Version Details Vulnerabilities
9 Application Libssh Libssh 0.6.4 Version Details Vulnerabilities
10 Application Libssh Libssh 0.6.5 Version Details Vulnerabilities
11 Application Libssh Libssh 0.7.0 Version Details Vulnerabilities
12 Application Libssh Libssh 0.7.1 Version Details Vulnerabilities
13 Application Libssh Libssh 0.7.2 Version Details Vulnerabilities
14 Application Libssh Libssh 0.7.3 Version Details Vulnerabilities
15 Application Libssh Libssh 0.7.4 Version Details Vulnerabilities
16 Application Libssh Libssh 0.7.5 Version Details Vulnerabilities
17 Application Libssh Libssh 0.8.0 Version Details Vulnerabilities
18 Application Libssh Libssh 0.8.1 Version Details Vulnerabilities
19 Application Libssh Libssh 0.8.2 Version Details Vulnerabilities
20 Application Libssh Libssh 0.8.3 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 3
Debian Debian Linux 1
Libssh Libssh 16

- References For CVE-2018-10933

https://www.exploit-db.com/exploits/45638/
EXPLOIT-DB 45638
https://www.libssh.org/security/advisories/CVE-2018-10933.txt CONFIRM
https://usn.ubuntu.com/3795-2/
UBUNTU USN-3795-2
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0016 CONFIRM
https://usn.ubuntu.com/3795-1/
UBUNTU USN-3795-1
https://www.debian.org/security/2018/dsa-4322
DEBIAN DSA-4322
http://www.securityfocus.com/bid/105677
BID 105677 Libssh CVE-2018-10933 Authentication Bypass Vulnerability Release Date:2018-10-22
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10933 CONFIRM
https://lists.debian.org/debian-lts-announce/2018/10/msg00010.html
MLIST [debian-lts-announce] 20181018 [SECURITY] [DLA 1548-1] libssh security update

- Metasploit Modules Related To CVE-2018-10933

libssh Authentication Bypass Scanner
This module exploits an authentication bypass in libssh server code where a USERAUTH_SUCCESS message is sent in place of the expected USERAUTH_REQUEST message. libssh versions 0.6.0 through 0.7.5 and 0.8.0 through 0.8.3 are vulnerable. Note that this module's success depends on whether the server code can trigger the correct (shell/exec) callbacks despite only the state machine's authenticated state being set. Therefore, you may or may not get a shell if the server requires additional code paths to be followed.
Module type : auxiliary Rank : normal


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