Detections
Analytics

OpenSSH 6.2 / 6.3 Remote Memory Corruption Vulnerability

medium Nessus Network Monitor Plugin ID 8050

Synopsis

The remote SSH service may be affected by a memory corruption vulnerability that could allow an attacker to execute arbitrary code in the context of the authenticated user.

Description

Versions of OpenSSH server before 6.4 may contain a memory corruption vulnerability that exists in the post-authentication 'sshd' process when an AES-GCM cipher is selected during key exchange. This issue can be exploited to execute arbitrary code with the privileges of an authenticated user and bypass restricted shell/command configurations.

Note: PVS has solely relied on the banner of the SSH client to perform this check. Any backported patches or workarounds such as recompiling or edited configurations are not observable through the banner.

Solution

Upgrade to OpenSSH version 6.4 or later.

See Also

http://www.openssh.com/txt/gcmrekey.adv

http://www.openssh.com/txt/release-6.4

http://seclists.org/fulldisclosure/2013/Nov/53

Plugin Details

Severity: Medium

ID: 8050

Family: SSH

Published: 11/12/2013

Updated: 9/16/2018

Risk Information

VPR

Risk Factor: Medium

Score: 5.8

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS v3

Risk Factor: Medium

Base Score: 6.3

Temporal Score: 5.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Patch Publication Date: 11/6/2013

Vulnerability Publication Date: 11/6/2013

Reference Information

CVE: CVE-2013-4548

BID: 63605