CVE-2021-4300 ghostlander Halcyon Block Verification main.cpp AddToBlockIndex access control
Remote attackers can bypass access controls in block verification, potentially modifying blockchain data in Halcyon cryptocurrency clients.
- 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-2021-4300?
CVE-2021-4300 is a medium-severity missing authorization vulnerability in ghostlander Halcyon, published on 4 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been found in ghostlander Halcyon and classified as critical. Affected by this vulnerability is the function CBlock::AddToBlockIndex of the file src/main.cpp of the component Block Verification. The manipulation leads to improper access controls. The attack can be launched remotely. Upgrading to version 1.1.1.0-hal is able to address this issue. The identifier of the patch is 0675b25ae9cc10b5fdc8ea3a32c642979762d45e. It is recommended to upgrade the affected component. The identifier VDB-217417 was assigned to this vulnerability.
Weakness: CWE-284
Which versions are affected by CVE-2021-4300?
It affects 1 product.
Products include Halcyon Project Halcyon.
How do I fix CVE-2021-4300?
No fix has been published for CVE-2021-4300 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-4300 being exploited?
There is no known exploitation of CVE-2021-4300 in the wild and no public exploit code.
Sources
Also known as GHSA-hxx9-636q-j4p5.