CVE-2017-5544 Denial of service in n/a
An attacker can cause a denial of service on FiberHome switches by exhausting SSH connection slots through rapid login attempts, requiring a device restart.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-5544?
CVE-2017-5544 is a medium-severity denial of service vulnerability in n/a, published on 23 Jan 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered on FiberHome Fengine S5800 switches V210R240. An unauthorized attacker can access the device's SSH service, using a password cracking tool to establish SSH connections quickly. This will trigger an increase in the SSH login timeout (each of the login attempts will occupy a connection slot for a longer time). Once this occurs, legitimate login attempts via SSH/telnet will be refused, resulting in a denial of service; you must restart the device.
Weakness: CWE-400
Which versions are affected by CVE-2017-5544?
It affects 1 product.
Products include Fiberhome Fengine S5800 Firmware.
How do I fix CVE-2017-5544?
No fix has been published for CVE-2017-5544 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-5544 being exploited?
There is no known exploitation of CVE-2017-5544 in the wild and no public exploit code.
Sources
Also known as GHSA-crmv-fcq6-r57v.