Dropbear SSH Server < 2016.72 Multiple Vulnerabilities
critical Nessus Plugin ID 93650
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Synopsis
The SSH service running on the remote host is affected by multiple vulnerabilities.Description
According to its self-reported version in its banner, Dropbear SSH running on the remote host is prior to 2016.74. It is, therefore, affected by the following vulnerabilities :- A format string flaw exists due to improper handling of string format specifiers (e.g., %s and %x) in usernames and host arguments. An unauthenticated, remote attacker can exploit this to execute arbitrary code with root privileges. (CVE-2016-7406)
- A flaw exists in dropbearconvert due to improper handling of specially crafted OpenSSH key files. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2016-7407)
- A flaw exists in dbclient when handling the -m or -c arguments in scripts. An unauthenticated, remote attacker can exploit this, via a specially crafted script, to execute arbitrary code. (CVE-2016-7408)
- A flaw exists in dbclient or dropbear server if they are compiled with the DEBUG_TRACE option and then run using the -v switch. A local attacker can exploit this to disclose process memory. (CVE-2016-7409)
Solution
Upgrade to Dropbear SSH version 2016.74 or later.See Also
Plugin Details
Severity: Critical
ID: 93650
File Name: dropbear_ssh_74.nasl
Version: 1.5
Type: remote
Family: Misc.
Published: 9/22/2016
Updated: 11/14/2019
Dependencies: ssh_detect.nasl
Risk Information
CVSS Score Source: CVE-2016-7407
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 7.4
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Temporal Vector: E:U/RL:OF/RC:C
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:matt_johnston:dropbear_ssh_server
Exploit Ease: No known exploits are available
Patch Publication Date: 7/21/2016
Vulnerability Publication Date: 7/21/2016
Reference Information
CVE: CVE-2016-7406, CVE-2016-7407, CVE-2016-7408, CVE-2016-7409