Vulnerability Monitor

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CVE-2017-3819

A privilege escalation vulnerability in the Secure Shell (SSH) subsystem in the StarOS operating system for Cisco ASR 5000 Series, ASR 5500 Series, ASR 5700 Series devices, and Cisco Virtualized Packet Core could allow an authenticated, remote attacker to gain unrestricted, root shell access. The vulnerability is due to missing input validation of parameters passed during SSH or SFTP login. An attacker could exploit this vulnerability by providing crafted user input to the SSH or SFTP command-line interface (CLI) during SSH or SFTP login. An exploit could allow an authenticated attacker to gain root privileges access on the router. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability can be triggered via both IPv4 and IPv6 traffic. An established TCP connection toward port 22, the SSH default port, is needed to perform the attack. The attacker must have valid credentials to login to the system via SSH or SFTP. The following products have been confirmed to be vulnerable: Cisco ASR 5000/5500/5700 Series devices running StarOS after 17.7.0 and prior to 18.7.4, 19.5, and 20.2.3 with SSH configured are vulnerable. Cisco Virtualized Packet Core - Single Instance (VPC-SI) and Distributed Instance (VPC-DI) devices running StarOS prior to N4.2.7 (19.3.v7) and N4.7 (20.2.v0) with SSH configured are vulnerable. Cisco Bug IDs: CSCva65853.

Published

2017-03-15T20:59:00.147

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 8.8 (HIGH)

CVSSv2 Vector

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

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: SINGLE
  • Confidentiality Impact: COMPLETE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

8.0

Impact Score

10.0

Weaknesses
  • Type: Secondary
    CWE-264
  • Type: Primary
    CWE-306
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application cisco asr_5000_series_software 18.0.0 Yes
Application cisco asr_5000_series_software 18.0.0.57828 Yes
Application cisco asr_5000_series_software 18.0.0.59167 Yes
Application cisco asr_5000_series_software 18.0.0.59211 Yes
Application cisco asr_5000_series_software 18.0.l0.59219 Yes
Application cisco asr_5000_series_software 18.1.0 Yes
Application cisco asr_5000_series_software 18.1.0.59776 Yes
Application cisco asr_5000_series_software 18.1.0.59780 Yes
Application cisco asr_5000_series_software 18.1_base Yes
Application cisco asr_5000_series_software 18.3.0 Yes
Application cisco asr_5000_series_software 18.3_base Yes
Application cisco asr_5000_series_software 18.4.0 Yes
Application cisco asr_5000_series_software 19.0.1 Yes
Application cisco asr_5000_series_software 19.0.m0.60737 Yes
Application cisco asr_5000_series_software 19.0.m0.60828 Yes
Application cisco asr_5000_series_software 19.0.m0.61045 Yes
Application cisco asr_5000_series_software 19.1.0 Yes
Application cisco asr_5000_series_software 19.1.0.61559 Yes
Application cisco asr_5000_series_software 19.2.0 Yes
Application cisco asr_5000_series_software 19.3.0 Yes
Application cisco asr_5000_series_software 20.0.0 Yes
Application cisco virtualized_packet_core v18.0_base Yes
Application cisco virtualized_packet_core v19.0_base Yes
Application cisco virtualized_packet_core v20.0_base Yes
References