Detections
Analytics

OpenSSH < 2.9.9 Multiple Key Type ACL Bypass

medium Nessus Network Monitor Plugin ID 1988

Synopsis

Remote users may be able to circumvent system policy.

Description

The remote host is running a version of OpenSSH between 2.5.x and 2.9.x. Depending on the order of the user keys in ~/.ssh/authorized_keys2, sshd might fail to apply the source IP based access control restriction to the correct key. This problem allows users to circumvent the system policy and login from disallowed source IP address.

Note: NNM 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 2.9.9 or higher.

See Also

http://www.kb.cert.org/vuls/id/905795

Plugin Details

Severity: Medium

ID: 1988

Family: SSH

Published: 8/20/2004

Updated: 3/6/2019

Nessus ID: 10771

Risk Information

VPR

Risk Factor: Medium

Score: 5.3

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.4

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

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 5.1

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

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

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Reference Information

CVE: CVE-2001-0816, CVE-2001-1380

BID: 3369