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

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

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.

See also :

https://matt.ucc.asn.au/dropbear/CHANGES
http://www.nessus.org/u?6ad7c2dd

Solution :

Update the affected package.

Risk factor :

High / CVSS Base Score : 9.3
(CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 101217 ()

Bugtraq ID:

CVE ID: CVE-2017-9078
CVE-2017-9079

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