Improper access control in Seal Finance (Seal)

1) Improper access control

EUVDB-ID: #VU49214

Risk: High

CVSSv3.1: 7.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-3006

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. The breed function in the smart contract implementation for Farm in Seal Finance (Seal), an Ethereum token, lacks access control and thus allows price manipulation.

Note, the vulnerability has been exploited in the wild in December 2020 and January 2021.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Seal Finance: All versions

External links

http://blocksecteam.medium.com/security-incident-on-seal-finance-fa79c27a1c3b
http://etherscan.io/address/0x33c2da7fd5b125e629b3950f3c38d7f721d7b30d

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.