Information disclosure in ZenGo X Gotham city

1) Cryptographic issues

EUVDB-ID: #VU79466

Risk: High

CVSSv4.0: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2023-33242

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to an error in Lindell17 TSS protocol implementation in crypto wallets. A remote attacker can extract the full ECDSA private key by exfiltrating a single bit in every signature attempt (256 in total).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Gotham city: 0.1.0 - 1.0.0

CPE2.3

• cpe:2.3:a:zengo_x:gotham_city:0.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:zengo_x:gotham_city:0.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:zengo_x:gotham_city:0.1.2:*:*:*:*:*:*:*

External links

https://www.fireblocks.com/blog/lindell17-abort-vulnerability-technical-report/
https://github.com/fireblocks-labs/zengo-lindell17-exploit-poc
https://eprint.iacr.org/2017/552.pdf
https://github.com/fireblocks-labs/mpc-ecdsa-attacks-23

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. However, a fully functional exploit for this vulnerability is available.