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CVE-2017-3819

UnknownEPSS 3.26%

Last modified

CVE-2017-3819 is a vulnerability of currently unknown severity. 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. EPSS estimates a 3.26% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.0
/10
EPSS Probability
3.26%

86.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAsr 5000 Series Software18.0.0
CiscoAsr 5000 Series Software18.0.0.57828
CiscoAsr 5000 Series Software18.0.0.59167
CiscoAsr 5000 Series Software18.0.0.59211
CiscoAsr 5000 Series Software18.0.l0.59219
CiscoAsr 5000 Series Software18.1.0
CiscoAsr 5000 Series Software18.1.0.59776
CiscoAsr 5000 Series Software18.1.0.59780
CiscoAsr 5000 Series Software18.1_base
CiscoAsr 5000 Series Software18.3.0
CiscoAsr 5000 Series Software18.3_base
CiscoAsr 5000 Series Software18.4.0
CiscoAsr 5000 Series Software19.0.1
CiscoAsr 5000 Series Software19.0.m0.60737
CiscoAsr 5000 Series Software19.0.m0.60828
CiscoAsr 5000 Series Software19.0.m0.61045
CiscoAsr 5000 Series Software19.1.0
CiscoAsr 5000 Series Software19.1.0.61559
CiscoAsr 5000 Series Software19.2.0
CiscoAsr 5000 Series Software19.3.0
CiscoAsr 5000 Series Software20.0.0
CiscoVirtualized Packet Corev18.0_base
CiscoVirtualized Packet Corev19.0_base
CiscoVirtualized Packet Corev20.0_base

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2017-3819?
Severity scoring for CVE-2017-3819 is pending analysis. The EPSS model estimates a 3.26% probability of exploitation in the next 30 days.
How do I fix CVE-2017-3819?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-3819?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST