CVE-2017-9855 Auth bypass in n/a
Predictable Grid Guard codes allow attackers to bypass secondary authentication and modify sensitive parameters on specific SMA solar inverters.
- 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-2017-9855?
CVE-2017-9855 is a critical authentication bypass vulnerability in n/a, published on 5 Aug 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in SMA Solar Technology products. A secondary authentication system is available for Installers called the Grid Guard system. This system uses predictable codes, and a single Grid Guard code can be used on any SMA inverter. Any such code, when combined with the installer account, allows changing very sensitive parameters. NOTE: the vendor reports that Grid Guard is not an authentication feature; it is only a tracing feature. Also, only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected
Weakness: CWE-863
Which versions are affected by CVE-2017-9855?
It affects 39 products.
Products include Sma Sunny Boy 1.5 Firmware, Sma Sunny Boy 2.5 Firmware, Sma Sunny Boy 3.0 Firmware, Sma Sunny Boy 3.6 Firmware, Sma Sunny Boy 3000tl Firmware, Sma Sunny Boy 3600 Firmware and 33 more.
How do I fix CVE-2017-9855?
No fix has been published for CVE-2017-9855 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2017-9855 being exploited?
There is no known exploitation of CVE-2017-9855 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-v4m3-hw9h-pqgx.