FreeBSD : Dropbear -- two vulnerabilities (60931f98-55a7-11e7-8514-589cfc0654e1)

High Nessus Plugin ID 101217


The remote FreeBSD host is missing a security-related update.


Matt Johnston reports :

Fix double-free in server TCP listener cleanup A double-free in the server could be triggered by an authenticated user if dropbear is running with -a (Allow connections to forwarded ports from any host) This could potentially allow arbitrary code execution as root by an authenticated user.

Fix information disclosure with ~/.ssh/authorized_keys symlink.
Dropbear parsed authorized_keys as root, even if it were a symlink.
The fix is to switch to user permissions when opening authorized_keys.


Update the affected package.

See Also

Plugin Details

Severity: High

ID: 101217

File Name: freebsd_pkg_60931f9855a711e78514589cfc0654e1.nasl

Version: $Revision: 3.2 $

Type: local

Published: 2017/07/05

Modified: 2018/02/01

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 9.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C


Base Score: 8.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:dropbear, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 2017/07/03

Vulnerability Publication Date: 2017/05/18

Reference Information

CVE: CVE-2017-9078, CVE-2017-9079