CVE-2017-6631 Denial of service in Cisco Yes Set-Top Box
Unauthenticated remote attackers can cause a denial of service on Cisco Yes set-top boxes by sending malformed XML requests to the HTTP RPC service.
- 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-2017-6631?
CVE-2017-6631 is a high-severity denial of service vulnerability in Cisco Yes Set-Top Box, published on 7 Sep 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the HTTP remote procedure call (RPC) service of set-top box (STB) receivers manufactured by Cisco for Yes could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability exists because the firmware of an affected device fails to handle certain XML values that are passed to the HTTP RPC service listening on the local subnet of the device. An attacker could exploit this vulnerability by submitting a malformed request to an affected device. A successful attack could cause the affected device to restart, resulting in a DoS condition. Yes has updated the affected devices with firmware that addresses this vulnerability. Customers are not required to take action. Vulnerable Products: This vulnerability affects YesMaxTotal, YesMax HD, and YesQuattro STB devices. Cisco Bug IDs: CSCvd08812.
Weakness: CWE-399
Which versions are affected by CVE-2017-6631?
It affects 3 products.
Products include Cisco Yesmax Hd Firmware, Cisco Yesmaxtotal Firmware, Cisco Yesquattro Firmware.
How do I fix CVE-2017-6631?
No fix has been published for CVE-2017-6631 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-2017-6631 being exploited?
There is no known exploitation of CVE-2017-6631 in the wild and no public exploit code.
Sources
Also known as GHSA-93fp-78rf-wf2r.