CVE-2018-17071 Business logic in n/a
Attackers can predict lottery outcomes and buy tickets cheaply due to flawed randomness and pricing logic in the Lucky9io smart contract.
- 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-2018-17071?
CVE-2018-17071 is a high-severity vulnerability in n/a, published on 18 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The fallback function of a simple lottery smart contract implementation for Lucky9io, an Ethereum gambling game, generates a random value with the publicly readable variable entry_number. This variable is private, yet it is readable by eth.getStorageAt function. Also, attackers can purchase a ticket at a low price by directly calling the fallback function with small msg.value, because the developer set the currency unit incorrectly. Therefore, it allows attackers to always win and get rewards.
Weakness: CWE-338
Which versions are affected by CVE-2018-17071?
It affects 1 product.
Products include Lucky9 Lucky9io.
How do I fix CVE-2018-17071?
No fix has been published for CVE-2018-17071 yet. Limit exposure of the affected software until one is available.
Is CVE-2018-17071 being exploited?
There is no known exploitation of CVE-2018-17071 in the wild and no public exploit code.
Sources
Also known as GHSA-f52j-f76h-vc62.