Executive Summary

Summary
Title libssh security update
Informations
Name DSA-4322 First vendor Publication 2018-10-17
Vendor Debian Last vendor Modification 2018-10-17
Severity (Vendor) N/A Revision 1

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:P/A:N)
Cvss Base Score 6.4 Attack Range Network
Cvss Impact Score 4.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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.

We recommend that you upgrade your libssh packages.

For the detailed security status of libssh please refer to its security tracker page at: https://security-tracker.debian.org/tracker/libssh

Original Source

Url : http://www.debian.org/security/2018/dsa-4322

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-287 Improper Authentication

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 15
Application 2
Application 1
Application 1
Application 1
Application 1
Os 4
Os 2
Os 1

SAINT Exploits

Description Link
libssh authentication bypass More info here

Nessus® Vulnerability Scanner

Date Description
2019-01-03 Name : The remote Fedora host is missing a security update.
File : fedora_2018-6b390ceb36.nasl - Type : ACT_GATHER_INFO
2019-01-03 Name : The remote Fedora host is missing a security update.
File : fedora_2018-c08cd808d3.nasl - Type : ACT_GATHER_INFO
2018-10-22 Name : The remote Fedora host is missing a security update.
File : fedora_2018-bca1c1ab49.nasl - Type : ACT_GATHER_INFO
2018-10-19 Name : The remote Debian host is missing a security update.
File : debian_DLA-1548.nasl - Type : ACT_GATHER_INFO
2018-10-18 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-4322.nasl - Type : ACT_GATHER_INFO
2018-10-18 Name : The remote FreeBSD host is missing one or more security-related updates.
File : freebsd_pkg_2383767cd22411e89623a4badb2f4699.nasl - Type : ACT_GATHER_INFO
2018-10-17 Name : The remote Slackware host is missing a security update.
File : Slackware_SSA_2018-289-01.nasl - Type : ACT_GATHER_INFO
2018-10-17 Name : The remote server is vulnerable to an authentication bypass.
File : libssh_0_8_4.nasl - Type : ACT_GATHER_INFO
2018-10-17 Name : The remote server is vulnerable to an authentication bypass.
File : libssh_0_8_4_remote.nasl - Type : ACT_ATTACK

Alert History

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0
1
Date Informations
2018-10-18 17:21:57
  • Multiple Updates
2018-10-17 21:18:30
  • First insertion