Executive Summary

Summary
Title Dropbear: Multiple vulnerabilities
Informations
Name GLSA-201702-23 First vendor Publication 2017-02-20
Vendor Gentoo Last vendor Modification 2017-02-20
Severity (Vendor) N/A Revision N/A

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:C/I:C/A:C)
Cvss Base Score 10 Attack Range Network
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Synopsis

Multiple vulnerabilities have been found in Dropbear, the worst of which allows remote attackers to execute arbitrary code.

Background

Dropbear is an SSH server and client designed with a small memory footprint.

Description

Multiple vulnerabilities have been discovered in Dropbear. Please review the CVE identifiers referenced below for details.

Impact

A remote attacker could possibly execute arbitrary code with root privileges if usernames containing special characters can be created on a system. Also, a dbclient user who can control username or host arguments could potentially run arbitrary code with the privileges of the process.

In addition, a remote attacker could entice a user to process a specially crafted SSH key using dropbearconvert, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All Dropbear users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/dropbear-2016.74"

References

[ 1 ] CVE-2016-7406 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7406
[ 2 ] CVE-2016-7407 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7407
[ 3 ] CVE-2016-7408 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7408
[ 4 ] CVE-2016-7409 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-7409

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

https://security.gentoo.org/glsa/201702-23

Original Source

Url : http://security.gentoo.org/glsa/glsa-201702-23.xml

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-20 Improper Input Validation
25 % CWE-284 Access Control (Authorization) Issues
25 % CWE-200 Information Exposure

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1

Nessus® Vulnerability Scanner

Date Description
2017-02-21 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201702-23.nasl - Type : ACT_GATHER_INFO
2016-09-26 Name : The remote Debian host is missing a security update.
File : debian_DLA-634.nasl - Type : ACT_GATHER_INFO
2016-09-22 Name : The SSH service running on the remote host is affected by multiple vulnerabil...
File : dropbear_ssh_74.nasl - Type : ACT_GATHER_INFO
2016-09-16 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_bc19dcca7b1311e6b99e589cfc0654e1.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
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Date Informations
2017-03-05 05:25:13
  • Multiple Updates
2017-03-03 21:25:22
  • Multiple Updates
2017-02-22 13:21:09
  • Multiple Updates
2017-02-21 05:18:58
  • First insertion