Improper access control in Loopring (LRC)

1) Improper access control

EUVDB-ID: #VU49213

Risk: High

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-35962

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 sellTokenForLRC function in the vault protocol in the smart contract implementation for Loopring (LRC), an Ethereum token, lacks access control for fee swapping and thus allows price manipulation.

Note, the vulnerability has been exploited in the wild in November 2020.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Loopring: All versions

External links

http://blocksecteam.medium.com/loopring-lrc-protocol-incident-66e9470bd51f
http://etherscan.io/address/0x4b89f8996892d137c3de1312d1dd4e4f4ffca171

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?

No. We are not aware of malware exploiting this vulnerability.