Vulnerability Monitor

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CVE-2019-1842

A vulnerability in the Secure Shell (SSH) authentication function of Cisco IOS XR Software 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. See the Details section for more information.

Published

2019-06-05T17:29:00.430

Last Modified

2024-11-21T04:37:30.750

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.4 (MEDIUM)

CVSSv2 Vector

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

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: SINGLE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: NONE
Exploitability Score

8.0

Impact Score

4.9

Weaknesses
  • Type: Secondary
    CWE-285
  • Type: Primary
    CWE-287
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System cisco ios_xr_firmware 6.1.2.tools Yes
Operating System cisco ios_xr_firmware 6.1.3.tools Yes
Operating System cisco ios_xr_firmware 6.2.3.tools Yes
Operating System cisco ios_xr_firmware 6.4.2.tools Yes
Hardware cisco asr_9001 - No
Hardware cisco asr_9006 - No
Hardware cisco asr_9010 - No
Hardware cisco asr_9901 - No
Hardware cisco asr_9904 - No
Hardware cisco asr_9906 - No
Hardware cisco asr_9910 - No
Hardware cisco asr_9912 - No
Hardware cisco asr_9922 - No
Hardware cisco crs-1_16-slot_line_card_chassis - No
Hardware cisco crs-1_16-slot_single-shelf_system - No
Hardware cisco crs-1_4-slot_single-shelf_system - No
Hardware cisco crs-1_8-slot_line_card_chassis - No
Hardware cisco crs-1_8-slot_single-shelf_system - No
Hardware cisco crs-1_fabric_card_chassis - No
Hardware cisco crs-1_line_card_chassis_\(dual\) - No
Hardware cisco crs-1_line_card_chassis_\(multi\) - No
Hardware cisco crs-1_multishelf_system - No
Hardware cisco crs-3_16-slot_single-shelf_system - No
Hardware cisco crs-3_4-slot_single-shelf_system - No
Hardware cisco crs-3_8-slot_single-shelf_system - No
Hardware cisco crs-3_multishelf_system - No
Hardware cisco crs-8\/s-b_crs - No
Hardware cisco crs-8\/scrs - No
Hardware cisco crs-x_16-slot_single-shelf_system - No
Hardware cisco crs-x_multishelf_system - No
Hardware cisco ncs_6008-8-slot_chassis - No
Hardware cisco network_convergence_system_5508 - No
References