CVE-2017-3819 Privilege escalation in Cisco StarOS
Authenticated attackers can gain root access on Cisco StarOS devices via crafted SSH/SFTP input, requiring valid credentials and SSH configuration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-3819?
CVE-2017-3819 is a high-severity vulnerability in Cisco StarOS, published on 15 Mar 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2017-3819?
It affects 2 products.
Products include Cisco Asr 5000 Series Software, Cisco Virtualized Packet Core.
How do I fix CVE-2017-3819?
No fix has been published for CVE-2017-3819 yet. Limit exposure of the affected software until one is available.
Is CVE-2017-3819 being exploited?
There is no known exploitation of CVE-2017-3819 in the wild and no public exploit code.
Other vulnerabilities in Cisco StarOS
- CVE-2017-6612 Open redirect in Cisco ASR 5000 Series Aggregation Services Routers
- CVE-2017-6672 Security feature bypass in Cisco ASR 5000 Series Aggregation Services Routers
- CVE-2016-6467 Denial of service in Cisco Aggregation Services Router (ASR) 5000 Series Switch
- CVE-2016-9203 Denial of service in Cisco ASR 5000
- CVE-2016-6466 Denial of service in Cisco StarOS 20.0.0 through 21.0.M0.64246
Sources
Also known as GHSA-vjhj-68j8-9q56.