Detections
Analytics
Cisco IOS XR Software Secure Shell Authentication Vulnerability (cisco-sa-20190605-iosxr-ssh)
medium Nessus Plugin ID 134173
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Synopsis
The remote device is missing a vendor-supplied security patchDescription
According to its self-reported version, Cisco IOS XR Software is affected by a vulnerability in the Secure Shell (SSH) authentication function of Cisco IOS XR Software that could allow an authenticated, remote attacker to successfully log in to an affected device using two distinct usernames. The vulnerability is due to a logic error that may occur when certain sequences of actions are processed during an SSH login event on the affected device. An attacker could exploit this vulnerability by initiating an SSH session to the device with a specific sequence that presents the two usernames. A successful exploit could result in logging data misrepresentation, user enumeration, or, in certain circumstances, a command authorization bypass.Please see the included Cisco BIDs and Cisco Security Advisory for more information
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvo03672See Also
Plugin Details
Severity: Medium
ID: 134173
File Name: cisco-sa-20190605-iosxr-ssh.nasl
Version: 1.8
Type: combined
Family: CISCO
Published: 3/2/2020
Updated: 4/8/2021
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 2.5
CVSS v2
Risk Factor: Medium
Base Score: 5.5
Temporal Score: 4.1
Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N
CVSS Score Source: CVE-2019-1842
CVSS v3
Risk Factor: Medium
Base Score: 5.4
Temporal Score: 4.7
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:cisco:ios_xr
Required KB Items: Host/Cisco/IOS-XR/Version
Exploit Ease: No known exploits are available
Patch Publication Date: 6/5/2019
Vulnerability Publication Date: 6/5/2019
Reference Information
CVE: CVE-2019-1842
BID: 108687